Bash:InternalVariables

lastmod 2024-07-27created 2020-10-064 edits

Internal variables of Bash (Internal variables)

List of internal variables

$BASHPID, $$

Process ID of the current Bash instance.

This is not the same as the $$ variable, but it often gives the same result.

$IFS

Input field separator

$COLUMNS

Width of the terminal window. When called from a script, the variable sometimes isn't printed. So use tput (tput cols) instead.

See also

• bash

Favorite site

• Advanced Bash-Scripting Guide: 9.1. Internal Variables
• 9.1. Internal Variables (Internal Variables)