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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 Environment Variable

❮ Bash Glossary
Share

An environment variable is a variable that the shell passes on to every program it starts. Common ones are HOME, PATH and USER.

A normal variable stays in the current shell. Use export to turn it into an environment variable.

Read an environment variable

echo "Your home is $HOME"
Your home is /home/user

Pass a variable to a new shell

bash -c starts a new shell, which only sees exported variables:

export GREETING="Hi"
bash -c 'echo $GREETING'
Hi

Related Pages

Bash Variables Tutorial Variable export PATH Variable Home Directory
❮ Bash Glossary
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