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$ echo $SHELL

$ bash

$ echo $PATH

$ export PATH=$PATH:/sbin:/usr/sbin:.

$ echo $LANG

~/.bash_profile

~/.bashrc

~/.bash_history

2.0   Environment Variables and Shell Variables

VariablesEnvironmentShell
Show current values$ env$ set
Set in bash, ksh$ export VAR=values$ VAR=values
Set in csh, tcsh$ setenv VAR values$ set var=(values)
ExamplesHOSTNAME
USER
MAIL
LANG
HOME
TERM		 (bash)
BASH_ENV
HISTFILE
PS1
SHELLOPTS

(tcsh)
autologout
history
prompt
path

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