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diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl
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+#!/usr/bin/perl
+
+# Test t0000..t9999.sh for non portable shell scripts
+# This script can be called with one or more filenames as parameters
+
+use strict;
+use warnings;
+
+my $exit_code=0;
+
+sub err {
+ my $msg = shift;
+ print "$ARGV:$.: error: $msg: $_\n";
+ $exit_code = 1;
+}
+
+while (<>) {
+ chomp;
+ /\bsed\s+-i/ and err 'sed -i is not portable';
+ /\becho\s+-n/ and err 'echo -n is not portable (please use printf)';
+ /^\s*declare\s+/ and err 'arrays/declare not portable';
+ /^\s*[^#]\s*which\s/ and err 'which is not portable (please use type)';
+ /\btest\s+[^=]*==/ and err '"test a == b" is not portable (please use =)';
+ /\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (please use FOO=bar && export FOO)';
+ # this resets our $. for each file
+ close ARGV if eof;
+}
+exit $exit_code;