A program (binary, or executable) is a file on disk somewhere, in a recognized format. Common formats include ELF on Linux, ...

Some of the most convenient ‘tricks’ on Linux depend on the use of a handful of special characters. This post looks at a number of command operators on Linux and shows how they work.

The echo command doesn’t require any variety of quote characters much of the time. You can echo a phrase like this without bothering with quotes of any kind. $ echo Enter your name: Enter your name: ...

This will take a similar visual for the command substitution. Let's rewrite the previous example using arithmetic expansion: pow() { if [ -z "$1" ]; then echo "usage: pow <base> <exponent>" else echo ...