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predefined shell variables

This page is heavily under construction, so don't take anything for granted found here.

$BASH

Not changable, known in BASH

$BASH_VERSION

Not changable, known in BASH

$EUID

Not changable, known in BASH

$HISTCMD

Not changable, known in BASH

$HOSTTYPE

Not changable, known in BASH

$LINENO

Not changable, known in BASH

$OLDPWD

Not changable, known in BASH

$OPTIND

Not changable, known in BASH
See getopts

$OPTARG

Not changable, known in BASH
See getopts

$OSTYPE

Not changable, known in BASH

$PPID

Not changable, known in BASH

$PROMPT_COMMAND

Not changable, known in BASH

$PWD

Not changable, known in BASH

$RANDOM

Not changable, known in BASH

$REPLY

Not changable, known in BASH
See select.

$SECONDS

Not changable, known in BASH

$SHLVL

Not changable, known in BASH

$UID

Not changable, known in BASH