Bash Scripting Cheat Sheet: Variables, Loops & Functions

Essential bash scripting reference: variables, conditionals, loops, functions, string manipulation, and error handling.

Variables

name='World'\necho 'Hello $name'\nreadonly PI=3.14\ntoday=$(date +%Y-%m-%d)

Conditionals

if [ -f 'file.txt' ]; then\n  echo 'exists'\nelif [ -d 'dir' ]; then\n  echo 'is directory'\nfi

Loops

for f in *.txt; do echo $f; done\nwhile read line; do echo $line; done < file.txt

Related Tools & Articles

• JSON Formatter
• Base64 Encoder
• Password Generator
• Regex Tester
• Hash Generator
• All 50+ Free Tools