t1700-split-index: date back files to avoid racy situations

diff --git a/t/check-non-portable-shell.pl b/t/check-non-portable-shell.pl
index d5823f71d8d57ec92404d5cceabd86d5ab86af53..b45bdac688c40104dd42ef68a07690420d96c142 100755 (executable)
--- a/t/check-non-portable-shell.pl
+++ b/t/check-non-portable-shell.pl
@@ -41,6 +41,9 @@ sub err {
        /^\s*[^#]\s*which\s/ and err 'which is not portable (use type)';
        /\btest\s+[^=]*==/ and err '"test a == b" is not portable (use =)';
        /\bwc -l.*"\s*=/ and err '`"$(wc -l)"` is not portable (use test_line_count)';
+       /\bhead\s+-c\b/ and err 'head -c is not portable (use test_copy_bytes BYTES <file >out)';
+       /(?:\$\(seq|^\s*seq\b)/ and err 'seq is not portable (use test_seq)';
+       /\bgrep\b.*--file\b/ and err 'grep --file FILE is not portable (use grep -f FILE)';
        /\bexport\s+[A-Za-z0-9_]*=/ and err '"export FOO=bar" is not portable (use FOO=bar && export FOO)';
        /^\s*([A-Z0-9_]+=(\w+|(["']).*?\3)\s+)+(\w+)/ and exists($func{$4}) and
                err '"FOO=bar shell_func" assignment extends beyond "shell_func"';