Summary of the method of viewing the currently used shells in Linux

Introduction

LinuxandUnixAll available out of the boxshell. Can be foundbash （Bourne Again shell）、ksh （Korn shell）、csh (C shell)/tcsh （TC shell）、sh （Bourne shell）Wait for default installationshell. But how do I check which one I am usingshell ？

method

Use $0 (best way)

echo $0

# $0 Contains the name of the currently running shell or script# If run in an interactive shell, it displays the shell name (bash, zsh, etc.)# If you run the script, it will display the file name of the script

Shows the currently runningshellThe name of
Sample output:/bin/bash、zsh、fish

Use $SHELL (default login Shell)

echo $SHELL

Show the default settings of the usershell(Not necessarily the current oneshell ）

Use the ps command

ps -p $$

# $$ Save the process ID (PID) of the current shell session# If used in a script, it provides the PID of the script shell

Show currentshellThe process
Sample output

 PID TTY          TIME CMD

Use the ps command to output shell names directly

ps -o comm= -p $$

Use echo $0 with base name

basename "$0"

# Show shell names without full path

Use readlink to get

readlink /proc/$$/exe

View all shells installed on the system

cat /etc/shells

Sample output

/bin/bash
/bin/csh
/bin/dash
/bin/ksh
/bin/sh
/bin/tcsh
/bin/zsh

Use grep to view

grep "^$USER" /etc/passwd

Use lsof to view

lsof -p $$

This is the end of this article about the method of viewing the current shell used by Linux. For more related content about viewing the current shell used by Linux, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!