Public bug reported:
Binary package hint: grep
(Originally reported by Mike Bianchi via Landscape)
The grep manpage has an example about --label that doesn't work:
gzip -cd foo.gz | grep --label=foo something
The above command does not show the "foo" label as expected because only
one "file" (in this case, stdin) is being grepped.
In order for it to work, -H (Print the file name for each match) needs
to be added or else the label will not be printed.
This can be solved by:
a) patching grep.c so it automatically adds -H whenever --label is used. This
would make the manpage correct. Something like this:
diff -uNr grep-2.5.3.orig/src/grep.c grep-2.5.3/src/grep.c
--- grep-2.5.3.orig/src/grep.c 2007-06-28 15:57:19.000000000 -0300
+++ grep-2.5.3/src/grep.c 2008-09-02 17:51:45.000000000 -0300
@@ -2137,6 +2137,7 @@
case LABEL_OPTION:
label = optarg;
+ with_filenames = 1;
break;
case 0:
b) patching the manpage to fix the example and mention that -H needs to be
added. Something like this:
"--label does not imply -H. If the standard input is the only file
read (with either no argument or the - argument) and you want
matches marked with the --label value, add -H."
c) do both, i.e., apply the patch and mention in the manpage that -H is
implied whenever using --label.
The less impacting change would probably be (b).
** Affects: grep (Ubuntu)
Importance: Undecided
Status: New
--
--label should be used with -H too
https://bugs.launchpad.net/bugs/264448
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