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Bash (Bourne Again Shell) is the most widely used Unix/Linux shell, allowing you to automate tasks by writing scripts — plain text files containing commands executed sequentially. This is essential for system administration, DevOps, and repetitive task automation.
Creating a simple script involves:
Create a file with .sh extension.
Add the shebang (#!/bin/bash) at the top to specify the interpreter.
Write commands inside the file.
Make it executable with chmod +x script.sh.
Run it using ./script.sh.
Example:
#!/bin/bashecho "Hello, World!"Copied!âś•CopyVariables store data for reuse. Assign without spaces:
Name="Alice"Age=25echo "Name: $Name, Age: $Age"Copied!âś•CopyBy default, variables are global. Use local inside functions to limit scope.
Decision-making uses if or case:
#!/bin/bashread -p "Enter age: " Ageif [ "$Age" -ge 18 ]; thenecho "You can vote"elseecho "You cannot vote"fiCopied!âś•CopyFor multiple conditions, case is cleaner
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