Bash Scripting Cheat Sheet

Bash Basics

• #!/bin/bash: Shebang to specify the shell used for the script
• echo "text": Print a message to the terminal
• ls: List the contents of the current directory
• cd /path/to/directory: Change to a different directory
• pwd: Print the current working directory

Variables

• variable="value": Assign a value to a variable
• echo $variable: Print the value of a variable
• $1, $2, etc.: Command line arguments
• $#: Number of command line arguments
• $@: All command line arguments
• $?: Exit status of the last command

Conditionals

• if [ condition ]; then ... fi: If statement
• else: Else statement
• elif: Else if statement
• -eq, -ne, -lt, -le, -gt, -ge: Comparison operators
• &&, ||: Logical operators

Loops

• for variable in list; do ... done: For loop
• while [ condition ]; do ... done: While loop

Files

• touch file.txt: Create an empty file
• cat file.txt: Display the contents of a file
• echo "text" > file.txt: Overwrite a file with text
• echo "text" >> file.txt: Append text to a file
• cp source destination: Copy a file
• mv source destination: Move or rename a file
• rm file.txt: Remove a file

Miscellaneous

• sleep n: Pause for n seconds
• chmod +x script.sh: Make a script executable
• source script.sh or ./script.sh: Execute a script

Note: This cheat sheet is intended as a quick reference and does not cover all aspects of bash scripting. It is important to consult the manual pages or other resources for more information and guidance.