Bash

1. 1

   What Is Bash

   Shell vs terminalBash vs sh vs zshInteractive shell vs scriptWhere Bash fits in DevOps
   20 min
2. 2

   Shebang and Your First Script

   Shebang#!/usr/bin/env bashChmod +x./script.sh vs bash script.shExit codes
   25 min
3. 3

   Variables and Quoting

   Variable assignmentDouble quotes vs single quotes${var} bracesCommand substitution $(...)
   25 min
4. 4

   Conditionals and Tests

   If statement[[ ]] testsString testsFile tests -f -d -e&& and ||Case statement
   30 min
5. 5

   Loops

   For loopWhile loopUntil loopFor f in *.txt globbingC-style for loopBreak and continue
   25 min
6. 6

   Functions

   Function definitionPositional args $1 $@ $#Return for exit codesEcho for outputLocal variables
   25 min
7. 7

   Arrays

   Indexed arrays${arr[@]}${#arr[@]} lengthAssociative arrays declare -AIterating arrays
   25 min
8. 8

   String and Arithmetic Expansion

   ${var#prefix}${var%suffix}${var//old/new}$(( arith ))Printf formatting
   25 min
9. 9

   IO Redirection and Pipes

   >>><2>2>&1&>+3
   25 min
10. 10

    Error Handling and Traps

    Set -eSet -uSet -o pipefailTrap on EXITTrap on ERRCleanup functions
    30 min
11. 11

    Debugging and Best Practices

    Bash -xSet -xShellcheckSafe quotingNever parse ls[[ vs [+1
    25 min
12. 12

    Capstone: Server Bootstrap Script

    Idempotent provisioningInstalling packagesCreating usersSSH key setupSystemd timersLogging+2
    60 min

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