Results for “working”
Small, practical examples. Search by task or narrow things down below.
Distinguish unset variables from empty strings
Bash Scripts: Omitting the colon tests only whether a variable is unset; including it also treats an empty value as missing.
Bash Scripts✓ Tested
Export a value to child processes
Bash Scripts: Only exported shell variables are inherited through the environment.
Bash Scripts✓ Tested
Extract a basename without an external process
Bash Scripts: Double hash removes the longest matching prefix ending in a slash.
Bash Scripts✓ Tested
Extract a parent path with parameter expansion
Bash Scripts: Percent removes the shortest matching slash-and-suffix portion.
Bash Scripts✓ Tested
Extract a substring by offset and length
Bash Scripts: Bash substring offsets start at zero for an ordinary string.
Bash Scripts✓ Tested
Format a numeric label with leading zeroes
Bash Scripts: Use a constant printf format string and supply values as separate arguments.
Bash Scripts✓ Tested
Forward all arguments without changing their boundaries
Bash Scripts: Quoted at-sign preserves empty arguments and embedded spaces.
Bash Scripts✓ Tested
Give a function an optional argument
Let callers omit a value while keeping nounset enabled.
optional argument✓ Tested
Give a function its own positional parameters
Bash Scripts: A function receives its call arguments without replacing the caller’s positional parameters.
Bash Scripts✓ Tested
Handle a filename pattern with no matches
Use nullglob so an unmatched pattern produces an empty array.
nullglob✓ Tested
Handle a nonzero background-job exit
Bash Scripts: Wait reports a child’s exit code; put it in a conditional when failure is expected.
Bash Scripts✓ Tested
Handle an expected command failure
Branch on a command’s exit code without aborting the script.
exit status✓ Tested