The make test-lint could check for some common non portable
grep usage:

The + as a qualifier is not a "basic regular expression".
Some grep understand \+, but in general egrep should be used.

The \t can not be used to find an ASCII TAB, neither
can \s be used to find a whitespace

Signed-off-by: Torsten Bögershausen <>
 t/ | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/t/ b/t/
index ff87611..58f8e2c 100755
--- a/t/
+++ b/t/
@@ -16,6 +16,8 @@ sub err {
 while (<>) {
+       / e?grep\s+\"[^"]*\\([st])/ and err "grep \\$1 is not portable)";
+       / [^e]grep.*\\\+/ and err 'grep with \+ is not portable (please use 
        /^\s*sed\s+-i/ and err 'sed -i is not portable';
        /^\s*echo\s+-(\S)\s+/ and err "echo -$1 is not portable (please use 
        /^\s*declare\s+/ and err 'arrays/declare not portable';

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