https://bugs.busybox.net/show_bug.cgi?id=10931 --- Comment #1 from Denys Vlasenko <vda.linux at googlemail.com> --- [[ ]] is a bashism. You can keep your scripts standard by using: aa='My string'; if [ "${aaa##*stri*}" = "" ]; then echo "It's there!"; fi -- You are receiving this mail because: You are on the CC list for the bug.