There are two approaches to start building sharable, reproduoble bash commands.

One$-$Liners

One$-$tiners are single commands or groups of commands written as one

line. These are usually command pipelines or Bash commands separated

by semicolons.

One$-$liners can wrap around in the terminal, but have no line breaks to

separate the script over numerous lines and can be copied and pasted

to the terminal.

Many developers retain a list of handy one$-$liners in a document for

quick reference.

Here's an example of a one$-$liner that reports disk consumption by file type. Copy

and paste this line into the terminal and press

to see it in action.

Bash scripts

Bash scripts are text files that contain one or more bash commands. A bash

script can be run two ways:

We can use the

command and the script name to tell Bash to run

the file's contents. We usually use the

filename extension for Bash

soripts.

We can create an executable script that can be run like a program.

We add a shebang line at the front of the script, to tell the shell which

program to use when the script is run.

This line starts with $x1$ followed by the path to the program running

the script.