BashDrill for shell patterns you actually use.
Practice quoting, variables, pipes, redirection, loops, exit status, and safer script debugging until the patterns become recall.
quotingpipesredirectionexit codesdebugging
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Syntax
Quoting, substitutions, variables, test expressions, and the small details that break scripts.
Streams
stdin, stdout, stderr, pipes, tee, append, overwrite, and file descriptor habits.
Safety
set flags, traps, dry-run thinking, cleanup, and common automation mistakes.