Usar:
if ! /opt/bin/md5sum -c /share/homes/admin/crypto.chk
then
# Do something
fi
O tuve la salida del bucle:
for i in "${locations[@]}"
do
cd "$i/aaaCryptoAudit"
/opt/bin/md5sum -c /share/homes/admin/crypto.chk
done | grep -q FAILED && echo "LIGHT THE SIGNAL FIRES"