Linux command: Check Current Shell

What is your current shell?

Ways to find current shell.

echo SHELL variable

$ echo $SHELL
/bin/sh

red-stone-one-carat% echo $SHELL
/bin/rzsh
red-stone-one-carat%

$ echo $0
/bin/sh

Look for SHELL variable when run env command

$ env
MAIL=/var/mail/learnlinuxfree
USER=learnlinuxfree
SSH_CLIENT=58.187.170.49 6126 22
HOME=/home/learnlinuxfree
SSH_TTY=/dev/pts/2
LOGNAME=learnlinuxfree
TERM=xterm
XDG_SESSION_ID=9760
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
XDG_RUNTIME_DIR=/run/user/1002
LANG=en_US.UTF-8
SHELL=/bin/sh
PWD=/home/learnlinuxfree
SSH_CONNECTION=58.187.170.49 6126 173.82.240.78 22

List of available shells on a system

$ cat /etc/shells
# /etc/shells: valid login shells
/bin/sh
/bin/dash
/bin/bash
/bin/rbash
/usr/bin/tmux

Change default shell for user

root@3:~# which usermod
/usr/sbin/usermod
root@3:~# usermod --shell /bin/bash tuyendq
root@3:~# 

List of common shells

• /bin/sh — Bourn shell
• /bin/bash — Bourn Again shell