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Level 3

Environment Vars


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env
show all environment variables
echo $VAR
show environment variable VAR
export NAME=value
set environment variable NAME to value
$PATH
executable search path environment variable
$HOME
home directory environment variable
$SHELL
current shell environment variable
uname
show operating system name
whoami
show username
uptime
show how long the system has been running
date
show system date
mount
list mounted filesystems
$EDITOR
text editor environment variable
$PAGER
pager environment variable - called by man, etc.