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Riley Berton rileyberton

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rcrowley / bad-side-effects-on-mac-osx.sh
Last active August 29, 2015 13:56
A protip for authors of shell programs. I use this pattern *all the time* for working in a temporary directory and cleaning it up after I'm done but a quirk in how shells interpret failures in command substitution caused a program like these to remove my coworker's home directory when he ran said program on Mac OS X, which doesn't have `mktemp -d`.
set -e
# Looks clever, is short, but removes your working directory on Mac OS X
# where `mktemp -d` fails.
cd "$(mktemp -d)"
trap "rm -rf \"$PWD\"" EXIT INT QUIT TERM
# ...