[PATCH] check-non-portable-shell: Check for non portable grep usage

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 <redacted>
---
 t/check-non-portable-shell.pl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl
index ff87611..58f8e2c 100755
--- a/t/check-non-portable-shell.pl
+++ b/t/check-non-portable-shell.pl

@@ -16,6 +16,8 @@ sub err {
 
 while (<>) {
 	chomp;
+	/ e?grep\s+\"[^"]*\\([st])/ and err "grep \\$1 is not portable)";
+	/ [^e]grep.*\\\+/ and err 'grep with \+ is not portable (please use egrep)';
 	/^\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 printf)";
 	/^\s*declare\s+/ and err 'arrays/declare not portable';

-- 
1.8.2.1.614.g66d7af5