<aside> 💡 What is Bash Script?

• "bash" and "bash script" refer to the same thing.

• "Bash" is the name of the Unix shell.
• It is a command-line interpreter that allows users to interact with the OS.

• "Bash script" refers to a script written in the Bash programming language.
• It is used to automate tasks and execute commands in the Unix environment.

• Remember, python can be written through cli, but also can be coded in .py file.
• Similarly bash can be written in cli and coded in .sh files.

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Debugging

set -x
./myscript.sh

• Type help set to get more info
• Set or unset values of shell options and positional parameters.
• -x flag to print commands and their arguments as they are executed.
• Using + instead of - causes these flags to be turned off.

Combining conditions

• [ $a -gt 3 ] && [ $a -lt 7 ] — true if $3 <\ a <\ 7$
• [ $a -le 3 ] || [ $a -ge 7 ] — true if $a >\ 7$ or $a\ <\ 3$

Shell arithmetic