Bash Functions, Arrays, getopts and trap: Practical Guide
Bash functions, arrays, getopts, trap, regex and parameter expansion explained with tested Ubuntu and RHEL examples, plus one small script that uses them all.
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Bash Variables Explained: Expansion, Quoting, Validation
Bash variables explained with real output: readonly, command substitution, integer math, ${var:-default}, string tricks, validation and quoting.
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