Bash Environment Variables

Here are some bash environment variables that are useful to know when you’re using the command prompt:

$0 - name of shell or shell script $1, $2, $3, … - positional parameters to script $# - count of positional parameters $? - exit status of most recent foreground task $- - current options that are set for the shell $$ - PID of the current shell (not subshell) $! - the PID of the most recent background command $DESKTOP_SESSION - path to the current display manager $EDITOR - preferred text editor $LANG - current language $PATH - directory list to search for executables (programs) $PWD - current working directory $SHELL - current shell $USER - current username $HOME - current user’s home directory $HOSTNAME - current name of the host $TERM - current terminal

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