In 't9811-git-p4-label-import.sh' the test 'tag that cannot be exported' runs !(p4 labels | grep GIT_TAG_ON_A_BRANCH) to check that the given string is not printed by 'p4 labels'. This is problematic, because according to POSIX [1]: "If the pipeline begins with the reserved word ! and command1 is a subshell command, the application shall ensure that the ( operator at the beginning of command1 is separated from the ! by one or more <blank> characters. The behavior of the reserved word ! immediately followed by the ( operator is unspecified." While most common shells still interpret this '!' as "negate the exit code of the last command in the pipeline", 'mksh/lksh' don't and interpret it as a negative file name pattern instead. As a result they attempt to run a command made up of the pathnames in the current directory (it contains a single directory called 'main'), which, of course, fails the test. We could fix it simply by adding a space between the '!' and '(', but instead let's fix it by removing the unnecessary subshell. [1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09_02 Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>