You can also execute commands through functions in the shell script. A function can take any number of arguments, and you can create a function to execute any command. Below is a shell script with a function that creates a folder and five files inside it. Here’s the output after executi...
Shell scripts can be made interactive with the ability to accept input from the command line. You can use thereadcommand to store the command line input in a variable. Add the following lines to the script: basic_script.sh #!/bin/bash# This is a comment# defining a variableecho"What is...
awk is a command-line tool that can be used in a variety of ways. It can be invoked directly from the command line, or it can be used in conjunction with a shell script. Here are some examples of how to use awk: Example 1: Counting the Number of Lines in a File To count the n...
Save the file and make the script executable. The script can only be run by root, therefore employ thesudo commandto run it as below: $ chmod +x sys_info.sh $ sudo bash -x sys_info.sh Shell Tracing – Show Error in Script
A basic shell script starts with#!/bin/bashon the first line, which tells Ubuntu to use the Bash shell to interpret the script. Following lines contain the commands you want to execute. How do I make my shell script executable? In the terminal, use thechmodcommand:chmod +x myscript.sh...
PostgreSQL: Using variables in SQL from shell scripts You can also use shell script variable inside the EOF block as shown below. #!/bin/sh dbname="test" username="test" wherecond="tgs" psql $dbname $username << EOF SELECT * FROM test WHERE col_name = '$wherecond'; ...
Running a bash shell script is quite simple. But you also get to learn about running them in the shell instead of subshell in this tutorial.
errexit - If a command in a Bash script exits with a non-zero status code, the entire script will stop. It can be prevented by ORing the failing command with a second command that returns a zero exit code to prevent the script from prematurely exiting. errtrace - A backtrace to the fai...
Replace/path/to/show_date.shwith the actual path to the shell script. For example, if the shell script is located in our home directory, the command would be: /bin/bash ~/show_date.sh Finally, we need to assign a shortcut key to the desktop shortcut.To do this, right-click on th...
Since a Bash script is a collection of Linux commands, any command you run in the terminal can be included in the script. Some examples include find, grep, man, ls, cd, etc. How to Execute the Bash Script Unlike other scripting languages, you don't need to install a compiler (or int...