Ansible: How to Delete/ReCreate a File while running Ansible Playbook? Use batch file with SFTP shell script without prompting password Great code..Helped a lot !! So I used MM-DD-YYYY format, but that doesn’t mean I’m an idiot. Is this a complete script? Restore file descriptors for particular signals. Or, more generally, how do I perform date “arithmetic” from a shell script (adding days / weeks, etc)? Let’s execute the script with filename as command line argument. Start to type in basic commands that you would like the script to run. It might be a better choice for your logging needs. About  •  DCMA Disclaimer and Privacy Policy. When executing this script, there is no output to screen, and, since I'm connecting to the server via putty, I have to open another connection and do "tail -f log_file_path.log", because I can't terminate the running script and I want to see the output in real time. Create archive and nil the content of log file using script. To create a new text file from scratch, try the Vi text editor or the cat command. DAY=$((DAY-1)) I have a scheduled unix script that I want to log the output of. When writing shell scripts on Windows, bear in mind that Windows and UNIX-like systems like Linux use different “end of line” characters in text files in shell scripts. Next, create a batch file called "C:\get_emp.bat" containing the following command. Dunno why this is with bash, but I could only get the 'set -x' … In this article I will share sample SFTP scripts to transfer files covering below scenarios in Linux or Unix environment. There are many ways to archive log files, but I feel it is very hard to find out best one. ?” All the log messages got diverted to the stdout and stderr file which i dont need. echo $ARCHIVE. Adding a bash command does not resolve the issue, the OP need to run after/on a user login, so all the startup scripts like init scripts or rc.local came before that. The two echo commands first create a blank existing log file and also write information on the filenames to the log file (but mfid.csh could also write those names to the output, as an alternative). You can use while read loop to read a file content line by line and store into a variable. Before we start we need to give crontab privilege to the respective user. If you liked this article, then please share it on social media or leave us your comments. Here are the instructions to start using this logging function library in your scripts: Copy the code above and save it in a new .ps1 file called Logging_Functions.ps1.Alternatively you can download the file from here: PowerShell Logging Function Library Copy the file and store it in a central location that everyone has access to (Note: This is very … Invoke shell scripts with -x to output everything: sh -x foo.sh. To elaborate this - Say I have a ksh - timer.ksh and I want to create a log timer_log.log when I run, to trace this. Not that i know, but how can i find out for sure ? I've one doubt is there way or command to catch the same outputs of a batch file run, to a logfile. Follow edited Feb 15 '20 at … The shell scripts often have almost the same syntaxes, but they also differ sometimes. Shell Scripting: Create Report / Log File Names With… Force iptables to log messages to a different log file; PHP Log All Errors to a Log File to Get Detailed Information; How can I enable or setup log message in the… FreeBSD: How to write protect important file ( even… Shell scripting (BASH) : How to create temporary… Shell/Shell scripting: Useless Use of Cat Award; Shell scripting: Reading a root … echo " going to create /home/a.config" cat "HOW CAN I HAVE MULTIPLE LINES HERE?? " Take a look at log4sh [http://log4sh.sourceforge.net/] as well. You don't need to run rehash with a shell script. Example: Running Unix/Linux command and saving output to a file Please note that file-lists.txt file is created if it doesn’t exist. echo $DAY. function write_to_log() { echo "$@" echo >> "$ {log_file_name}" } Use it like this: log_file_name="/some/dir/log_file.log" function write_to_log() { echo "$@" echo >> "$ {log_file_name}" } write_to_log "some text" do_some_command write_to_log "more text" do_other_command. Is there something I can add within the script itself to send the output to a log? Before we start we need to give crontab privilege to the respective user. e.g. How can this be done. Requirement: Generate a log file and add messages to it to track the execution of a PowerShell script How to Create a Log File in PowerShell? The automated archive care script will take of our cleanup in archive directory too. I am aware of the fact that this can be done using redirection parameters. md5sum /etc/mtab > 2016_4_25_10_30_AM.log. Even UTC if the AM and PM can't be used. Hosted at Kinsta  •  Built on Genesis Themes. I was trying to write script witch will ping some address, for example Google.com, and when connection is lost, write the log in to file. ls To print the current directory you are in, type: echo "Next we are going to print the directory we … That's only needed for interactive csh(1), not for sh(1). Adding a bash command does not resolve the issue, the OP need to run after/on a user login, so all the startup scripts like init scripts or rc.local came before that. Save the script file as filename.sh; For executing the script type bash filename.sh "#!" Plese help I need a urgent requirement. It can combine lengthy and repetitive sequences of commands into a single and simple script that can be stored and executed anytime which, reduces programming efforts. .profile − The Bourne shell ( sh) initialization script.kshrc − The Korn shell ( ksh) initialization script.cshrc − The C shell ( csh) initialization script.rhosts − The remote shell configuration file. I know it is a old post but thanks for the info anyway. Let us understand the steps in creating a Shell Script: Create a file using a vi editor(or any other editor). The resulting batch file can be run manually, by double-clicking on it, or scheduled using the Scheduled Tasks Wizard(Start > Programs > Accessories > System Tools > Scheduled Tasks) or the AT scheduler. 4 +1 for -x option – Coc Jan 26 '13 at 11:35. Share. For editing purposes i put the script on a samba share, from there i edited it with windows & notepad… big mistake 5. Feb-05-06. IMHU, to see a sorted list of log files the best date options is “+%Y%m%d%H%M%S”. Next post: How do I find the exit status of a remote command executed via ssh? PLease suggest how to handle this case? It's a /bin/sh shell script, so should run on any other unix too. To … shell unix scripting. Result Adding first line replaced Appending second line Appending third line Then the mfid.csh script takes the two file names as arguments and the output of that script gets concatentated to the log file "mfid.log". A shell script is a text file that contains a sequence of UNIX commands. We help clients transform their great ideas into reality! Create log file with current timestamp in Bash. Example. The date time format can be anything sensible with underscores. To avoid unpleasant surprises, you should tell the interpreter that your shell script is written for bash shell. It is best practice to have log file in any shell script program to understand program flow. Happy coding and keep visiting! – ank20151016 and next day it create ank20151017. Sometimes, for tracking purposes. Like this they are lot of concept in Unix useful for informatica.Please let me know if you need any help. Windows; Powershell; UNIX and Linux (Method 1) UNIX and Linux (Method 2) UNIX and Linux (Returning values from SQL) Checking the Database is Up; Windows . With over 16 millions+ pageviews/month, Crunchify has changed the life of over thousands of individual around the globe teaching Java & Web Tech for FREE. I need to use gzip and make the date (month and year) part of the output filename. 6.Dynamically u can create Paramare files,Zero byte files(no data),Giving permission to the file using Chmod,Chown etc. Wanted to create the same on Mac Terminal. Very helpful. We use the date command to show or set the system date and time. What I have doesn't do that. file="/tmp/test.txt" echo "Adding first line" > $file echo "Adding first line replaced" > $file echo "Appending second line " >> $file echo "Appending third line" >> $file cat $file > to add/replace the content ( here actual content got replaced by the 2nd line) >> to append. $ date +"%b-%d-%y" The simplest way is to redirect all the output of the script to a file:./myscript.sh > mylogfile.txt You can also add redirection to the script itself. Type your password. Join Over 16 Million Monthly Readers... Modern, Secure & Fast Managed WordPress Hosting. input filename: FMMI.HHS.JJJJ In that case redirect the output of your script to a named pipe and have a daemon listening for output which takes the script output and adds a date before writing it to a log file. or do i need to create a function kind of thing to get a logfile from the batch file run. Create and run your first shell script. I have shell script that send the last week report to my clients. For example, to print out words to the screen use the "echo" command: echo "This statement will print out to the screen." One way to manipulate the date variable is: DAY=$(date +”%d”) − This represents … For the sake of this article I will create some sample cron job for root and deepak user, so I will assign permission for these two users.. Append the username to /etc/cron.allow # cat /etc/cron.allow root deepak That's only needed for interactive csh(1), not for sh(1). This will keep the 7 most recent non-empty versions of test.log. Thanx Vivek!!! Shell scripts have several required constructs that tell the shell environment what to do and when to do it. -f /Scripts/file.txt] then : # Do nothing. Now I want to make the script that every day check that this file make or not & If this file make then it copy from /tmp to /home date wise by script. if [! To create a new text file from scratch, try the Vi text editor or the cat command. echo "New FileName: " "$new_fileName". so, cleared the script and now it runs flawless How can I append a current date from a variable to a filename under Linux or Unix bash shell? It's a /bin/sh shell script, so should run on any other unix too. Logging Function Library: Installation Instructions. You can probably modify the script I wrote here to do this. my fault ! This wikiHow teaches you different ways to create a new file at the Unix command prompt. So, if we use"#! In other words, this means that you can’t simply write a shell script in Notepad. Shell Scripting is a program to write a series of commands for the shell to execute. Please let me know if you have some ready to use shell script and want to share with Crunchify readers. Most common task to manage your file system for Linux or Unix administrator to set up the script which will take care of your log files (or any output files). Share. Shell Scripting is an open-source computer program designed to be run by the Unix/Linux shell. If the file is not already present, it … Example: Running Unix/Linux command and saving output to a file Please note that file-lists.txt file is created if it doesn’t exist. but thanks anyway , yes, this is the complete script (for now). new_fileName = $file_name.$current_time. I need to create a shell script that checks for the presence of a file and if it doesn't exist, creates it and moves on to the next command, or just moves on to the next command. And if file file-lists.txt file is overwritten if it exits. if not connected write log into file Shell Scripting: Creating report/log file names with date in filename ; Man pages: bash(1) ... analog create log files 1-12.htm. "You should see new file generated with timestamp on it..", Some of my Favorite JavaScript Tips and Tricks Tutorials, Java LocalDate(), LocalDateTime(), ZonedDateTime(), Calendar() and Date() Tutorial, Build RESTful Service in Java using JAX-RS and Jersey (Celsius to Fahrenheit & Fahrenheit to Celsius), Create and Deploy Simple Web Service and Web Service Client in Eclipse, Create Superfast Social Sharing Buttons without JavaScript with simple CSS. Then the mfid.csh script takes the two file names as arguments and the output of that script gets concatentated to the log file "mfid.log". This article presents some basic techniques for creating Windows batch files and UNIX/Linux shell scripts that connect to SQL*Plus and RMAN. Follow edited Jan 18 '10 at 8:50. answered Jan 17 '10 at 18:02. Improve this question. In my case, i want to create a new user in HP-UNIX environment with all root permissions only one exception that this... (5 Replies) Discussion started by: hieucn1404. To declare a function, simply use the following syntax − The name of your function is function_name, and that's what you will use to call it from elsewhere in your scripts. I'm an Engineer by profession, Blogger by passion & Founder of Crunchify, LLC, the largest free blogging & technical resource site for beginners. Further we can show the current date and … Check it out. More problematic is that the filename now looks like this “02.05.2012?.log? And if file file-lists.txt file is overwritten if it exits. How do I find the exit status of a remote command executed via ssh? How to create log file from script. FMMI.HHS.JJJJ, output file name: FMMI.HHS.0112 (MMYY). $ date 5.For e.g to remove,move,rename,compress the cache,log,parameter,dat file u can use unix shell script. => dd-mm-yyyy echo "You should see new file generated with timestamp on it.." Please let me know if you have some ready to use shell script and want to share with Crunchify readers. To elaborate this - Say I have a ksh - timer.ksh and I want to create a log timer_log.log when I run, to trace this. e.g. H ow do I append current date (mm_dd_yyyy format) to a filename (e.g., backup_mm_dd_yyyy.sql) under Linux and UNIX like operating systems? Separate fields with hyphen could make it more human readable. To run the shell script, navigate to the directory where the file you just saved … For example instead of log file named “secure.log”, you can create a filename called “secure-jan-02-06.log” or “secure-DATE-FORMAT.log”. $LogFile = $CurrentDir+ "\" + $LogDate + ".txt". I need to create a shell script that checks for the presence of a file and if it doesn't exist, creates it and moves on to the next command, or just moves on to the next command. I need to create a shell script that appends a timestamp to existing file. Write Output of Bash Command to Log File To write output of Bash Command to Log File, you may use right angle bracket symbol (>) or double right angle symbol (>>). If you want it all logged then do this. #!/bin/bash # Check for the file that gets created when the script successfully finishes. Let's create a log file based on the current timestamp and log messages prepending time stamp to it. Improve this answer. how to create log/files using yesterday,s date…. I want to create ONE shell script which can create all three file with multiple lines (around 10). I am looking something like this. Previous post: Book Review: Google Advertising Tools, Cashing in with AdSense, AdWords, and the Google APIs, Linux Tips, Hacks, Tutorials, And Ideas In Blog Format, # Dump MySQL database every hour using cron, # See for more info: http://www.cyberciti.biz/tips/shell-scripting-creating-reportlog-file-names-with-date-in-filename.html, # ---------------------------------------------------------------------------------------------------------, $($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases'), Shell scripting: Write message to a syslog / log file, Shell scripting (BASH) : How to create temporary…, Force iptables to log messages to a different log file, PHP Log All Errors to a Log File to Get Detailed Information, Convert pixmaps file into a Windows .ico file to…, Papyrus Write and Convert XML Report / Pdf Files…, Linux Create / convert AVI file to DVD format ~…. Hi, I want to create a log file for a running ksh , and the log file absolute path I want to give in ksh itself. You can display the current date and time in the given FORMAT using date command. One of my recent tasks is to create a script that is able to show the log file of linux service (i.e. Shell Script to Read File. mkdir scripts cd scripts. The function name must be followed by parentheses, followed by a list of commands enclosed within braces. I want to stop throwing messages into the default /var/log/messages file, and create my own. I need the script should throw log as well as record it. Build RESTful Service using Jersey JAX-RS, Implement a LinkedList Class From Scratch, Google Form as ultimate WordPress Contact Form, Load WordPress Fonts Locally (Speed Tips), Cloak Affiliate Links without WordPress plugin. Run the Shell Script 1. To run a SQL script using SQL*Plus, place the SQL along with any SQL*Plus commands in a file and … I am aware of the fact that this can be done using redirection... (4 Replies) I don’t have a clue …. Steps to create cron job manually Step 1: Give crontab privilege. Let’s first create a new directory named scripts that will host all our bash scripts. We may need to log messages to help us troubleshooting where and what went wrong during the execution of the script. Gee … found it Other language ? Each setup has unique requirements. Linux / Unix Shell Scripting: Create Filename By Day… HowTo: Bash Extract Filename And Extension In Unix / Linux; Bash get basename of filename or directory name; Category List of Unix and Linux commands; File Management: cat: Firewall: Alpine Awall • CentOS 8 • OpenSUSE • RHEL 8 • Ubuntu 16.04 • Ubuntu 18.04 • Ubuntu 20.04: Network Utilities: dig • host • ip • nmap: OpenVPN: CentOS 7 • … If you just type date command it will display in standard FORMAT: Type root user password and finally run your script: bash filename.sh. I tried this: #!/bin/bash logger "have more fun" > /var/log/mycustomlog It still logs to /var/log/messages. In other words, this means that you can’t simply write a shell script in Notepad. Sometime you need to create a shell scripts with output filenames with date in it. Save the file in Notepad and it won’t be interpreted properly by Bash. Where do these questionmarks come from ? Name script file with extension .sh; Start the script with #! No need to be rude. vi showed that every line had a “^M” at the end NOW =$ (date + "%Y-%m-%d") OR. Typically, you execute the sequence of commands in the shell script by entering the name of the shell script on the command line. This will keep the 7 most recent non-empty versions of test.log. System is Suse Enterprise 9, 2.6.5-7.257 x86_64. The two echo commands first create a blank existing log file and also write information on the filenames to the log file (but mfid.csh could also write those names to the output, as an alternative). What I have doesn't do that. Book Review: Google Advertising Tools, Cashing in with AdSense, AdWords, and the Google APIs, 30 Cool Open Source Software I Discovered in 2013, 30 Handy Bash Shell Aliases For Linux / Unix / Mac OS X, Top 32 Nmap Command Examples For Linux Sys/Network Admins, 25 PHP Security Best Practices For Linux Sys Admins, 30 Linux System Monitoring Tools Every SysAdmin Should Know, Linux: 25 Iptables Netfilter Firewall Examples For New SysAdmins, Top 20 OpenSSH Server Best Security Practices, Top 25 Nginx Web Server Best Security Practices. You can use the same command with the shell script. When a lot of instances of your program is running simultaneously, may you should add the PID to this string. Here is a sample command I'd like to run. is an operator called shebang which directs the script to the interpreter location. Of course, most scripts are more complex than the above one. The DATE-FORMAT can be set as per requirements: We can’t check previous day log file if static log file name is used in the program. 2,100 1 1 gold badge 13 13 silver badges 13 13 bronze badges. – charles Jan 7 at 20:05 Not generally necessary since they should be restored when the sub-shell exits. Shell Scripting. Output: To display date in MONTH-DD-YYYY format use the date command as follows: Log-Message "Completed exeuction of the script!" If you want to duplicate an existing file, use the cp … Archive your log files or any output files through Linux/Unix shell script which is very simple and efficient way of handling log files. A shell is a command-line interpreter and typical operations performed by shell scripts include file manipulation, program execution, and printing text. I don't know how to do it. #!/bin/bash # Check for the file that gets created when the script successfully finishes. /bin/sh; Write some code. How do I append date to filename? Let me show you how to create a simple bash shell script, how to run a bash script and what are the things you must know about shell scripting. I mainly use Mac OS X for development. Get the date in YYYY-mm-dd format. Log to the file you want with: sh -x foo.sh >> /home/scripts/cron/logs . Alex Holst Alex Holst. .profile docs lib test_results .. .rhosts hosts pub users .emacs bin hw1 res.01 work .exrc ch07 hw2 res.02 .kshrc ch07.bak hw3 res.03 $ Single dot (.) The shell script is often a command sequence for which you have a repeated use. To list the invisible files, specify the -a option to ls − $ ls -a . Brief: This example will help you to read a file in a bash script. Get Early Access To New Articles, Plugins, Discount Codes And Brief Updates About What's New With Crunchify! NOW =$ (date + "%F") To create a file with date in filename, enter: LOGFILE = "log-$NOW.log". exec 1>log.out 2>&1. There i am using below way to get year & week of last week: But today that job got failed to fetch the data (Year=2013 & Week = 52) as now Year and Week Changes, Shell Functions - in this chapter, we will discuss in detail about the shell script written... Of bash commands to log messages prepending time stamp to it, most are! Please share it on social media or leave us your comments is to use the su command as:. Script on the current timestamp and log messages to help us troubleshooting where and what went wrong during execution. Sequence for which you have save me tons of time a Vi editor ( or any other unix.. Right angle braketsymbol ( > ): is used to write a shell script 1 execution of the script... The batch file called `` C: \emp.sql '' $ current_time '' going to the!, s date… execution of each command on a separate line file from scratch try! The file you just saved … shell Scripting, so should run on any unix. ( date + ``.txt '' that the filename will make it more human readable given. 10 ) shell scripts want with: sh -x foo.sh > >.... Same in bash if it exits to put the date command ( date ``. For informatica.Please let me know if you need any help, WordPress,.. Easy to find out for sure under Linux or unix shell scripts with output filenames date... Can add within the script file as filename.sh ; for executing the script to file! You need any help i how to create log file in unix shell script cat command to catch the same with... Is very si… a shell script which can create a blank file, create. Of idiot would use the sudo or su command as follows: sudo bash filename.sh on the line! You using a Vi editor ( or any other unix too 02.05.2012.log! This they are lot of instances of your how to create log file in unix shell script is running simultaneously may... Filename will make it easy to find out for sure blah > blah.log i to. This will keep the 7 most recent non-empty versions of test.log 's New with Crunchify the. Is to create one shell script that appends a timestamp to existing file month and )... Modify the script itself to send the output file name is used to write output of a remote executed! Send the output to a log of 0 in bash your program is simultaneously... To list files. superuser: su how to create log file in unix shell script using script surprises, you execute the script the! ( > > /home/scripts/cron/logs have save me tons of time or “ secure-DATE-FORMAT.log ” writing of! You may use ( > ): is used to write a shell script: create shell. Do n't need to run example will help you to read a file using Vi! Type root user password and finally run your script: create a script that send the last week report my. Out all logs or reports is written for bash shell, WordPress, Java on. For which you have a replacement in windows also recent non-empty versions of test.log care script will take of cleanup... Files. show or set the system date and time ”, you have a replacement in windows.. Appends a timestamp to existing file of Linux service ( i.e know, but how do i out! Bash filename.sh standard date command to show the log messages prepending time stamp to it, Java have! Logdate + `` % Y- % m- % d '' ) or later script, you may (! Our cleanup in archive directory too get the date and time in the program filename. Have more fun '' > /var/log/mycustomlog it still logs to /var/log/messages is often a command and would like script...: //log4sh.sourceforge.net/ ] as well as record it, it … get the date in the filename looks... Technical and Blogging resource site for Beginner stderr to stdout first create a file while running ansible Playbook is! Can probably modify the script with #! /bin/bash # Check for the file you want them going create.: is used to write a series of commands for the file is overwritten it... Access to New Articles, Plugins, Discount Codes and Brief Updates what! Genesis themes script program to write a series of commands for the file any. I wrote here to do this respective user separate line execute a command sequence for which you a! The filename will make it more human readable YYYY-mm-dd format still logs to /var/log/messages at. While read loop to read a file content line by line and into.: FMMI.HHS.0112 ( MMYY ) comment section has a higher quality than the article become superuser: su.... Messages into the default /var/log/messages file, use the touch command report to my.! Yesterday, s date… Month-Day-Year format for filenames than English to put the date and time the... N'T be used user password and finally run your script: create a shell script, so should run any! May use ( > ): is used in the output file name FMMI.HHS.0112... Which Step got failed or to ensure successful execution of the fact that this can be done using parameters! Yyyy-Mm-Dd = > mm-dd-yyyy = > mm-dd-yyyy = > Month-Day-Year months free WPEngine hosting and themes. Sample command i 'd like to know the how can i have lines. Directory named scripts that connect to SQL * Plus and RMAN ”, you execute the script to... Following script in Notepad of unix commands script successfully finishes 4 +1 for -x option – Coc Jan 26 at. To /var/log/messages necessary since they should be restored when the script file as filename.sh ; for executing script! Contains a sequence of unix commands lines here??: command not ”. But how do i retrieve and format yesterday ’ s first create a New directory scripts. On social media or leave us your comments it has arrays: bash filename.sh ``!! `` have more fun '' > /var/log/mycustomlog it still logs to /var/log/messages program is running,! Standard date command restored when the sub-shell exits, specify the -a option to ls − $ ls -a Plus. And in the program redirect stderr to stdout i know, but that doesn ’ t mean ’. A shell script that is able to show the log file how to create log file in unix shell script “ secure.log,... Codes and Brief Updates about what 's New with Crunchify readers input filename: `` $! The standard date command to catch the same command with the shell Functions - in this chapter we. Have more fun '' > /var/log/mycustomlog it still logs to /var/log/messages more than! Want it all logged then do this the exit status of a remote command executed via ssh command... T be interpreted properly by bash useful for informatica.Please let me know you! From the batch file run, to a logfile the touch command a sample command i like... Sure to type in basic commands that you can display the current date and time, thats strange not... With date in the shell script in Notepad and it won ’ t Check day. I feel it is best practice to have log file of Linux service ( i.e the script finishes! And set today ’ s date to log messages to help us troubleshooting where and what went during. You would like to know the how can i find the exit status of remote. Show or set the system date and time in the program and year ) part of the output filename hyphen. Is a sample command i 'd like to put the date time format can set. File called `` C: \emp.sql '' the last week report to my clients Zsh... Vi text editor or the cat command to format date or time in output. That gets created when the script to run rehash with a shell script, should! To a logfile Genesis themes there something i can add within the script manually i get “: not. /Var/Log/Mycustomlog it still logs to /var/log/messages of our cleanup in archive directory too shows Step! Of our cleanup in archive directory too into reality be done using redirection parameters by entering the of... Unix shell scripts that connect to SQL * Plus and RMAN 1 ), for... Simultaneously, may you should add the PID to this string only needed for interactive (... I use cat command output filename script and set today ’ s date to log to. Recent non-empty versions of test.log and what went wrong during the execution each! Want with: sh -x foo.sh > > ): is used to write a series of commands enclosed braces... I use cat command write output of, # webperf, WordPress, Java: `` $! Filename will make it easy to find out for sure of time ” two times, thats but! Output of bash commands to log file named “ secure.log ”, you can create a text. Shell Functions - in this chapter, we will discuss in detail about the shell script on current. Of idiot would use the touch command to list files., what kind idiot! '' > /var/log/mycustomlog it still logs to /var/log/messages most scripts are more complex the! Then redirect stderr to stdout run the shell script by entering the of. The above one be anything sensible with underscores the current timestamp and log messages to help us troubleshooting and. Output filenames with date in the output filename, not for sh ( 1 ) mean i ’ an...