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Usage Function and Argument Guard

Bash & Scripting · easy · solved in-browser (no VM needed) · 3 tiered hints

Write /home/player/backup.sh that starts with a #!/bin/bash shebang, defines a `usage` function printing how to call the script, and guards its arguments: if fewer than one argument was given (test `$# -lt 1`) it must call usage and `exit 1`. (Authored config, graded structurally — the engine isn't run here.)

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