Re: _Z suffix

[Paul Eggert]

address@hidden writes:

>> gzip -f test_Z
> gzip: test_Z already has _Z suffix -- unchanged
>
> But the gzip man page lists ony the following suffixes (admittedly: for 
> gunzip;
> but one would expect the same in this case):
>
> .gz, -gz, .z, -z, _z or .Z
>
> (Same problem exists for files like test-Z.)
> How can I force compression on such files? (with suffix _Z, -Z)

Thanks for the bug report.  -f should work here.  Also, the
documentation should say case is ignored.  I installed this and it
should appear in the next gzip version.  In the meantime you can
work around it by temporarily renaming the file (ugh!).

2007-05-07  Paul Eggert  <address@hidden>

        * NEWS: 'gzip -f foo.gz' now works instead of complaining.
        * gzip.c (make_ofname): Implement this.
        Problem reported by Sven Hartrump in
        <http://lists.gnu.org/archive/html/bug-gzip/2007-05/msg00003.html>.

        * NEWS, gzip.1: Document that case is ignored when looking at file name
        extensions.
        * doc/gzip.texi (Overview): Likewise.

Index: NEWS
===================================================================
RCS file: /cvsroot/gzip/gzip/NEWS,v
retrieving revision 1.16
diff -u -p -r1.16 NEWS
--- NEWS        13 Apr 2007 21:42:54 -0000      1.16
+++ NEWS        7 May 2007 23:24:51 -0000
@@ -2,6 +2,12 @@ Major changes in Gzip 1.3.12 (2007-04-13

 * znew now uses $TMPDIR (default /tmp) instead of always using /tmp.

+* 'gzip -f foo.gz' now creates a file foo.gz.gz instead of complaining.
+
+* It is now documented that gzip ignores case when examining file name
+  extensions; for example, 'gzip test.Gz' (without -f) fails because
+  the file name ends in '.Gz'.
+
 Major changes in Gzip 1.3.11 (2007-02-05)

 * As per the GNU coding standards, the behavior of gzip and its
Index: gzip.c
===================================================================
RCS file: /cvsroot/gzip/gzip/gzip.c,v
retrieving revision 1.16
diff -u -p -r1.16 gzip.c
--- gzip.c      20 Mar 2007 05:09:51 -0000      1.16
+++ gzip.c      7 May 2007 23:24:51 -0000
@@ -1165,7 +1165,7 @@ local int make_ofname()
        }
         /* ofname might be changed later if infile contains an original name */

-    } else if (suff != NULL) {
+    } else if (suff && ! force) {
        /* Avoid annoying messages with -r (see treat_dir()) */
        if (verbose || (!recursive && !quiet)) {
            /* Don't use WARN, as it affects exit status.  */
Index: gzip.1
===================================================================
RCS file: /cvsroot/gzip/gzip/gzip.1,v
retrieving revision 1.6
diff -u -p -r1.6 gzip.1
--- gzip.1      8 Dec 2006 18:45:37 -0000       1.6
+++ gzip.1      7 May 2007 23:24:51 -0000
@@ -72,7 +72,7 @@ legal.
 .PP
 .I gunzip
 takes a list of files on its command line and replaces each
-file whose name ends with .gz, -gz, .z, -z, _z or .Z
+file whose name ends with .gz, -gz, .z, -z, or _z (ignoring case)
 and which begins with the correct magic number with an uncompressed
 file without the original extension.
 .I gunzip
Index: doc/gzip.texi
===================================================================
RCS file: /cvsroot/gzip/gzip/doc/gzip.texi,v
retrieving revision 1.5
diff -u -p -r1.5 gzip.texi
--- doc/gzip.texi       5 Feb 2007 23:29:04 -0000       1.5
+++ doc/gzip.texi       7 May 2007 23:24:51 -0000
@@ -80,7 +80,7 @@ Free Documentation License''.
 @command{gzip} reduces the size of the named files using Lempel-Ziv coding
 (LZ77).  Whenever possible, each file is replaced by one with the
 extension @samp{.gz}, while keeping the same ownership modes, access and
-modification times.  (The default extension is @option{-gz} for @abbr{VMS},
+modification times.  (The default extension is @samp{-gz} for @abbr{VMS},
 @samp{z} for @abbr{MSDOS}, @abbr{OS/2} @abbr{FAT} and Atari.)
 If no files are specified or
 if a file name is "-", the standard input is compressed to the standard
@@ -113,8 +113,9 @@ compressed file is not suitable for its 
 constructed from the original one to make it legal.

 @command{gunzip} takes a list of files on its command line and replaces
-each file whose name ends with @samp{.gz}, @samp{.z}, @samp{.Z},
address@hidden, @option{-z} or @samp{_z} and which begins with the correct
+each file whose name ends with @samp{.gz}, @samp{.z}
address@hidden, @samp{-z}, or @samp{_z} (ignoring case)
+and which begins with the correct
 magic number with an uncompressed file without the original extension.
 @command{gunzip} also recognizes the special extensions @samp{.tgz} and
 @samp{.taz} as shorthands for @samp{.tar.gz} and @samp{.tar.Z}