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Double quote array expansions to avoid re-splitting elements SH-2068
Bug risk
Critical
a year ago
—
a year old
Double quote array expansions to avoid re-splitting elements
2export DYLD_LIBRARY_PATH=.
3export DYLD_INSERT_LIBRARIES=libft_malloc.so
4export DYLD_FORCE_FLAT_NAMESPACE=1
5$@
Description
Double quotes around $@ (and similarly, ${array[@]}) prevents globbing and word splitting of individual elements, while still expanding to multiple separate arguments.
Let's say you have four arguments: baz, foo bar, * and /*/*/*/*.
"$@" will expand into exactly that: baz, foo bar, * and /*/*/*/*.
$@ will expand into multiple other arguments: baz, foo, bar, file.txt, otherfile.jpg, and (eventually) a list of most files on the system.
Since the latter is rarely expected or desired, this issue warns you about it.
Problematic code:
cp $@ ~/dir
Correct code:
cp "$@" ~/dir