Internal variables

Bash internal variables at a glance

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HOME

etc...

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FUNCNAME

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PWD

HISTSIZE

IFS

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OLDPWD

PATH

OSTYPE

MACHTYPE

PPID

HOSTTYPE

SECONDS

SHELLOPTS

HOSTNAME

EDITOR

BASH VERSION

BASH VERSINFO

BASH ENV

BASHPID

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RANDOM

SHLVL

LINENO

GROUPS

UID

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