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1. • 
     • A shell script is simply a text file with a ".sh" extension that has executable permissions.
     www.tecmint.com › understand-linux-shell-and-basic-shell-scripting-language-tips

     Understand Linux Shell and Basic Shell Scripting - Part 1

2. Top results related to what is a shell script in linux mint os

   • What does "read -p" do in a linux shell script?

     Top Answer

     Answered Apr 13, 2017 · 20 votes

     First off, the structure <command> -<option> means that you want to execute <command> using the option corresponding to <option>. A - after a command means that the following letter is an option. Most commands have several options you can use. Options are usually defined using either a single letter or a couple of words separated by -.

     Side Note: For options that are a couple of words rather than a single letter, often it will use two minus signs -- instead of one, signifying that it is a "long named" option.

     So, using the read -p example, this means you want to execute read using the p option, which stands for prompt.

     Now, sometimes an option will require an argument. In your examples, the options to useradd have arguments. Arguments are usually defined like <command> -<option> [argument]. So, in the useradd example, $group is an argument for the option g.

     Now for the commands themselves:

     read

     is a bash built-in (not a POSIX shell command) that reads from standard input.

     • The -p option makes it read as a prompt, meaning it doesn't add a trailing newline before trying to read input.

     if

     checks the return status of the test command (in this case id -u $username >/dev/null 2>&1)

     • If the return status is 0, the then part is executed

     id

     prints user groups and ids

     • The -u option "prints only the effective user ID".
     • >/dev/null 2>&1 redirects standard input and standard error to /dev/null, meaning they do not get printed to the terminal.

     useradd

     creates a new user

     • -g sets the initial group for the user
     • -s sets the name of the user's login shell
     • -d sets the name of the user's login directory
     • -m says to create the user's home directory if it does not exist.
     • -p defines the user's encrypted password.

     For future reference, you can look up commands in the linux manual pages by doing man <command> on the command line. These manual pages tell you what a command does, as well as explaining all of its options.

     Bash built-ins like read are all on a single man page that is not the easiest thing to use. For those I find googling them easier. Usually http://ss64.com/ will come up in the results, which contains the info from the bash built-ins man page, but separated into different pages by command. I find this much easier to use.

     Check all answers on Stack Overflow

     1/5

   • what is the best way to start a script in boot time on linux

     Top Answer

     Answered Jul 06, 2023 · 9 votes

     There are a couple of ways to achieve this, but you will need root privileges for any the following. To get root, open a terminal and run the command:

     sudo su-

     and the command prompt will change to '#' indicating that the terminal session has root privileges.

     Alternative #1. Add an initscript

     Create a new script in /etc/init.d/myscript:

     vi /etc/init.d/myscript-

     (Obviously it doesn't have to be called "myscript".) In this script, do whatever you want to do. Perhaps just run the script you mentioned:

     #!/bin/sh/path/to/my/script.sh-

     Make it executable:

     chmod ugo+x /etc/init.d/myscript-

     Configure the init system to run this script at startup:

     update-rc.d myscript defaults-

     Alternative #2. Add commands to /etc/rc.local

     vi /etc/rc.local-

     with content like the following:

     # This script is executed at the end of each multiuser runlevel/path/to/my/script.sh || exit 1 # Added by meexit 0-

     Alternative #3. Add an Upstart job

     Create /etc/init/myjob.conf:

     vi /etc/init/myjob.conf-

     with the following content:

     description "my job"start on startuptaskexec /path/to/my/script.sh

     BTW:

     You don't need to be root if you can edit your crontab (crontab -e) and create an entry like this:

     @reboot /path/to/script.sh-

     This way, you can run it as a regular user. @reboot just means it's run when the computer starts up (not necessarily just when it's rebooted).

     Check all answers on Stack Overflow

     2/5

   • Linux shell script to copy last lines of a file in a directory to append to a file in another directory

     Top Answer

     Answered Oct 10, 2014 · 0 votes

     `"tail -"$Lines1"f /opt/grinder/svn/IAVS/GrinderLogs/GrinderBaseLogs/Lg2Logs/"$GrinderLg2"-"$c"-data.log>>/opt/grinder/svn/IAVS/GrinderLogs/GrinderBaseLogs/"$GrinderLG1"-"$c"-data.log"`-

     change to

     tail -"$Lines1"f /opt/grinder/svn/IAVS/GrinderLogs/GrinderBaseLogs/Lg2Logs/"$GrinderLg2"-"$c"-data.log>>/opt/grinder/svn/IAVS/GrinderLogs/GrinderBaseLogs/"$GrinderLG1"-"$c"-data.log-

     should work.

     In my setup i have tested as below way

     #!/bin/sh`"tail -10f filename"`-

     give error filename not found

     But

     #!/bin/shtail -10f filename-

     This works fine.

     Check all answers on Stack Overflow

     3/5

   • What is "-le" in shell script?

     Top Answer

     Answered Jan 15, 2016 · 2 votes

     As is stated in the documentation:

     integer comparison

     (...)

     -lt

     : is less than

     if [ "$a" -lt "$b" ]

     So it interprets the values of $a and $b (in your case $stage and 2) as integers and performs a comparison. If the first element is less than or equal to the second, the test succeeds and the then part will be executed.

     As the documentation later states, one can use <= as well:

     <=

     : is less than or equal to (within double parentheses)

     (("$a" <= "$b"))

     But then one uses double parentheses (as specified in the documentation).

     Check all answers on Stack Overflow

     4/5

   • Linux Shell Script For Each File in a Directory Grab the filename and execute a program

     Top Answer

     Answered Feb 19, 2010 · 227 votes

     bash:

     for f in *.xls ; do xls2csv "$f" "${f%.xls}.csv" ; done-

     Check all answers on Stack Overflow

     5/5

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3. linuxways.net › mint › how-to-create-and-run-a-shellHow to Create and Run a Shell Script in Linux Mint 20

   linuxways.net › mint › how-to-create-and-run-a-shell

   • Cached

   Dec 31, 2020 · This tutorial presented to you the method of creating and running a shell script in Linux Mint 20 in the most simplified manner. So now, by following the very same procedure, you can even write and execute complex shell scripts in Linux Mint 20 very easily.

4. People also ask

   What is a shell script in Linux?

   • First off, a shell script is simply a file that contains a series of Linux commands and shell statements. When a shell script is executed, it in turn executes the commands listed in the script. It starts at the top and executes the commands on each line, one line a time, until the end of the file. By the way, the script’s filename doesn’t matter.

   Getting Started with Shell Scripting: Writing Your First Script

   www.linuxtrainingacademy.com/writing-your-first-linux-script/

   See all results for this question

   How to run a shell script in Linux Mint 20?

   • We can run a shell script in Linux Mint 20 by executing the following command: Executing this command will display the message that we have written in our shell script as shown in the image below: Alternatively, you can also execute the following command to run the very same shell script: The result of this command is shown in the image below.

   How to Create and Run a Shell Script in Linux Mint 20

   linuxways.net/mint/how-to-create-and-run-a-shell-script-in-linux-mint-20/

   See all results for this question

   What is a script in Linux?

   • Scripts are collections of commands stored in a file. The shell can read this file and act on the commands as if they were typed at the keyboard. The shell also provides a variety of useful programming features to make scripts truly powerful.

   Understand Linux Shell and Basic Shell Scripting - Part 1 - Tecmint

   www.tecmint.com/understand-linux-shell-and-basic-shell-scripting-language-tips/

   See all results for this question

   What is shell in Linux?

   • Shell accepts human-readable commands from users and converts them into something which the kernel can understand. It is a command language interpreter that executes commands read from input devices such as keyboards or from files. The shell gets started when the user logs in or starts the terminal. Shell is broadly classified into two categories –

   Introduction to Linux Shell and Shell Scripting - GeeksforGeeks

   www.geeksforgeeks.org/introduction-linux-shell-shell-scripting/

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5. www.geeksforgeeks.org › introduction-linux-shellIntroduction to Linux Shell and Shell Scripting - GeeksforGeeks

   www.geeksforgeeks.org › introduction-linux-shell

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   Apr 16, 2024 · A shell script comprises the following elements – Shell Keywords – if, else, break etc. Shell commands – cd, ls, echo, pwd, touch etc. Functions; Control flow – if..then..else, case and shell loops etc. Why do we need shell scripts? There are many reasons to write shell scripts: To avoid repetitive work and automation

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6. Videos

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     Linux Mint Shell Scripting for Beginners -Part 1

     Jan 26, 2013

     46.9K Views

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     itsfoss.com

     How to Run a Shell Script in Linux [Essentials Explained]

     Jan 24, 2021

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     11:46

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     Shell Scripting Tutorial for Beginners 1 - Introduction

     Feb 18, 2017

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7. www.howtogeek.com › 67469 › the-beginners-guide-toThe Beginner's Guide to Shell Scripting: The Basics - How-To Geek

   www.howtogeek.com › 67469 › the-beginners-guide-to

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   Sep 29, 2015 · Shell scripts allow us to program commands in chains and have the system execute them as a scripted event, just like batch files. They also allow for far more useful functions, such as command substitution. You can invoke a command, like date, and use it's output as part of a file-naming scheme.

   • Author: Yatri Trivedi

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8. www.reallinuxuser.com › how-to-execute-a-sh-fileHow to execute a .sh file in Linux Mint - Real Linux User

   www.reallinuxuser.com › how-to-execute-a-sh-file

   • Cached

   Aug 15, 2018 · Most applications for Linux Mint and other distributions can be directly installed from a software manager. But what if an executable file comes in a .sh format?

9. www.freecodecamp.org › news › shell-scripting-crashShell Scripting for Beginners – How to Write Bash Scripts in ...

   www.freecodecamp.org › news › shell-scripting-crash

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   Mar 31, 2022 · Shell scripting is an important part of process automation in Linux. Scripting helps you write a sequence of commands in a file and then execute them. This saves you time because you don't have to write certain commands again and again.

10. www.tecmint.com › understand-linux-shell-and-basicUnderstand Linux Shell and Basic Shell Scripting - Part 1

    www.tecmint.com › understand-linux-shell-and-basic

    • Cached

    Jan 31, 2024 · About Shell Script. A shell script is simply a text file with a ".sh" extension that has executable permissions. Here are some tips to guide you through the process of writing and executing a script: Begin your script with a shebang line (#!/bin/bash) to specify the interpreter.

11. www.linuxtrainingacademy.com › writing-your-firstGetting Started with Shell Scripting: Writing Your First Script

    www.linuxtrainingacademy.com › writing-your-first

    • Cached

    First off, a shell script is simply a file that contains a series of Linux commands and shell statements. When a shell script is executed, it in turn executes the commands listed in the script. It starts at the top and executes the commands on each line, one line a time, until the end of the file. By the way, the script’s filename doesn’t matter.