Menu
×
NEW W3Schools app iOS & Android Start the adventure Spaces Upgrade Paid Courses Spaces Upgrade Paid Courses
   ❮   
HTML CSS JAVASCRIPT SQL PYTHON JAVA PHP C C++ C# AWS W3.CSS HOW TO BOOTSTRAP REACT MYSQL JQUERY EXCEL XML DJANGO NUMPY PANDAS NODEJS DSA TYPESCRIPT ANGULAR ANGULARJS GIT POSTGRESQL MONGODB ASP AI R GO KOTLIN SWIFT SASS VUE GEN AI SCIPY CYBERSECURITY DATA SCIENCE INTRO TO PROGRAMMING HTML & CSS BASH RUST TOOLS

Bash Tutorial

Bash HOME Bash Intro Bash Get Started
Get Started Code Challenge

Basic Commands

Bash Commands Bash List (ls)
List (ls) Code Challenge
Bash Change Dir (cd)
Change Dir (cd) Code Challenge
Bash Print Dir (pwd)
Print Dir (pwd) Code Challenge
Bash Echo (echo)
Echo (echo) Code Challenge
Bash Concatenate (cat)
Concatenate (cat) Code Challenge
Bash Copy (cp)
Copy (cp) Code Challenge
Bash Move (mv)
Move (mv) Code Challenge
Bash Remove (rm)
Remove (rm) Code Challenge
Bash Timestamp (touch)
Timestamp (touch) Code Challenge
Bash Make Dir (mkdir)
Make Dir (mkdir) Code Challenge
Bash Find Files (find)
Find Files (find) Code Challenge
Bash Manual (man) Bash Alias
Alias Code Challenge

Pipes and Redirection

Bash Redirection
Redirection Code Challenge
Bash Pipes (|)
Pipes (|) Code Challenge
Bash Build Commands (xargs)
Build Commands (xargs) Code Challenge

Text Processing

Bash Search Text (grep)
Search Text (grep) Code Challenge
Bash Pattern Scan (awk)
Pattern Scan (awk) Code Challenge
Bash Stream Editor (sed)
Stream Editor (sed) Code Challenge
Bash Remove Section (cut)
Remove Section (cut) Code Challenge
Bash Sort Lines (sort)
Sort Lines (sort) Code Challenge
Bash View End (tail) Bash View Start (head)
View Start (head) Code Challenge
Bash Count (wc)
Count (wc) Code Challenge
Bash Unique Lines (uniq)
Unique Lines (uniq) Code Challenge
Bash Translate (tr)
Translate (tr) Code Challenge
Bash Compare Files (diff)
Compare Files (diff) Code Challenge

System Monitoring

Bash Process Status (ps) Bash List Processes (top) Bash Disk Space (df) Bash Directory Usage (du) Bash Memory Usage (free) Bash Terminate (kill) Bash Uptime

Networking

Bash Ping Bash URL Transfer (curl) Bash Downloader (wget) Bash Remote Connect (ssh) Bash Secure Copy (scp) Bash File Sync (rsync)

File Compression

Bash Compress (zip) Bash Extract (unzip) Bash TAR Archive
TAR Archive Code Challenge

File Permissions

Bash Ownership
Ownership Code Challenge
Bash Modify (chmod)
Modify (chmod) Code Challenge
Bash Ownership (chown) Bash Group (chgrp)

Scripting

Bash Syntax
Syntax Code Challenge
Bash Script
Script Code Challenge
Bash Variables
Variables Code Challenge
Bash Data Types
Data Types Code Challenge
Bash Operators
Operators Code Challenge
Bash If...Else
If...Else Code Challenge
Bash Case
Case Code Challenge
Bash Loops
Loops Code Challenge
Bash Functions
Functions Code Challenge
Bash Script Arguments
Script Arguments Code Challenge
Bash Read Input (read)
Read Input (read) Code Challenge
Bash Exit Codes
Exit Codes Code Challenge
Bash Arrays
Arrays Code Challenge
Bash Strings
Strings Code Challenge
Bash Here Documents
Here Documents Code Challenge
Bash Trap Signals (trap)
Trap Signals (trap) Code Challenge
Bash Schedule (cron)

Bash Cert

Bash Certificate

Bash Reference

Bash Glossary

Exercises and Quiz

Bash Exercises Bash Challenges Bash Quiz

Bash Process

❮ Bash Glossary
Share

A process is a program that is running. Every process has a number, its process ID (PID).

ps lists processes, and kill sends a signal to a process by its PID. $$ holds the PID of the current shell.

List and stop a process

The numbers below are examples; your PIDs will differ:

ps
    PID TTY          TIME CMD
   1234 pts/0    00:00:01 bash
   5678 pts/0    00:00:02 python3
kill 5678

Related Pages

Bash ps Tutorial Background Job trap Special Parameters Command
❮ Bash Glossary
This way to the W3Schools Adventure app
Learn more about Adventure Mode›

Free account

Track your progress

XP earned 0 Day streak 0 Spaces 0 League —

New

Learn in Adventure Mode W3Schools Adventure App

Coding fundamentals as bite-sized lessons and challenges.

Download on the App Store GET IT ON Google Play TRY NOW IN Browser
PLUS
SPACES
GET CERTIFIED
FOR TEACHERS
PRACTICE
CONTACT US
×

Contact Sales

If you want to use W3Schools services as an educational institution, team or enterprise, send us an e-mail:
sales@w3schools.com

Report Error

If you want to report an error, or if you want to make a suggestion, send us an e-mail:
help@w3schools.com

Top Tutorials
HTML Tutorial
CSS Tutorial
JavaScript Tutorial
How To Tutorial
SQL Tutorial
Python Tutorial
W3.CSS Tutorial
Bootstrap Tutorial
PHP Tutorial
Java Tutorial
C++ Tutorial
jQuery Tutorial
Top References
HTML Reference
CSS Reference
JavaScript Reference
SQL Reference
Python Reference
W3.CSS Reference
Bootstrap Reference
PHP Reference
HTML Colors
Java Reference
AngularJS Reference
jQuery Reference
Top Examples
HTML Examples
CSS Examples
JavaScript Examples
How To Examples
SQL Examples
Python Examples
W3.CSS Examples
Bootstrap Examples
PHP Examples
Java Examples
XML Examples
jQuery Examples
Get Certified
 HTML Certificate
CSS Certificate
JavaScript Certificate
Front End Certificate
SQL Certificate
Python Certificate
PHP Certificate
jQuery Certificate
Java Certificate
C++ Certificate
C# Certificate
XML Certificate
FORUM ABOUT CAMPUS
W3Schools is optimized for learning and training. Examples might be simplified to improve reading and learning.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness
of all content. While using W3Schools, you agree to have read and accepted our terms of use, cookies and privacy policy.

Copyright 1999-2026 by Refsnes Data. All Rights Reserved. W3Schools is Powered by W3.CSS.