base-files/functions.sh: use grep -q instead of []
It's cleaner and faster as it does not need to do extra work. Also removed $() to avoid executing the output. The shell can handle it. https://github.com/koalaman/shellcheck/wiki/SC2143 Signed-off-by: Rosen Penev <rosenp@gmail.com> [correct || to && for one conversion] Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>master
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