The new BSD-licensed gzip(1) in FreeBSD as well as the GNU gzip(1) available through ports now support the -k option to prevent both gzip & gunzip from deleting the input file after processing it. Attached patch to 1.3.12follows.
http://www.freebsd.org/cgi/query-pr.cgi?pr=113397<javascript:ol('http://www.freebsd.org/cgi/query-pr.cgi?pr=113397');>
# # (!c) 2007 by Ighighi # # Tested on gzip 1.3.12 (available at archivers/gzip) # http://www.freebsd.org/cgi/query-pr.cgi?pr=113397 # --- gzip.1.orig Fri Dec 8 14:45:37 2006 +++ gzip.1 Tue Jun 5 21:44:20 2007 @@ -4,7 +4,7 @@ .SH SYNOPSIS .ll +8 .B gzip -.RB [ " \-acdfhlLnNrtvV19 " ] +.RB [ " \-acdfhklLnNrtvV19 " ] .RB [ \-S\ suffix ] [ .I "name \&..." @@ -12,7 +12,7 @@ .ll -8 .br .B gunzip -.RB [ " \-acfhlLnNrtvV " ] +.RB [ " \-acfhklLnNrtvV " ] .RB [ \-S\ suffix ] [ .I "name \&..." @@ -223,6 +223,9 @@ .TP .B \-h --help Display a help screen and quit. +.TP +.B \-k --keep +Keep (don't delete) input files during compression or decompression. .TP .B \-l --list For each compressed file, list the following fields: --- gzip.c.orig Tue Mar 20 01:09:51 2007 +++ gzip.c Tue Jun 5 21:43:50 2007 @@ -216,6 +216,8 @@ suppresses a "Broken Pipe" message with some shells. */ static int volatile exiting_signal; +/* If nonzero, unlink input file on exit. */ +static int remove_ifname = 1; /* If nonnegative, close this file descriptor and unlink ofname on error. */ static int volatile remove_ofname_fd = -1; @@ -243,6 +245,7 @@ /* {"encrypt", 0, 0, 'e'}, encrypt */ {"force", 0, 0, 'f'}, /* force overwrite of output file */ {"help", 0, 0, 'h'}, /* give help */ + {"keep", 0, 0, 'k'}, /* keep (don't delete) input files */ /* {"pkzip", 0, 0, 'k'}, force output in pkzip format */ {"list", 0, 0, 'l'}, /* list .gz file contents */ {"license", 0, 0, 'L'}, /* display software license */ @@ -319,6 +322,7 @@ " -f, --force force overwrite of output file and compress links", " -h, --help give this help", /* -k, --pkzip force output in pkzip format */ + " -k, --keep keep (don't delete) input files", " -l, --list list compressed file contents", " -L, --license display software license", #ifdef UNDOCUMENTED @@ -423,7 +427,7 @@ z_suffix = Z_SUFFIX; z_len = strlen(z_suffix); - while ((optc = getopt_long (argc, argv, "ab:cdfhH?lLmMnNqrS:tvVZ123456789", + while ((optc = getopt_long (argc, argv, "ab:cdfhH?klLmMnNqrS:tvVZ123456789", longopts, (int *)0)) != -1) { switch (optc) { case 'a': @@ -446,6 +450,8 @@ force++; break; case 'h': case 'H': help(); do_exit(OK); break; + case 'k': + remove_ifname = 0; break; case 'l': list = decompress = to_stdout = 1; break; case 'L': @@ -825,7 +831,7 @@ if (!to_stdout) { sigset_t oldset; - int unlink_errno; + int unlink_errno = 0; copy_stat (&istat); if (close (ofd) != 0) @@ -833,7 +839,8 @@ sigprocmask (SIG_BLOCK, &caught_signals, &oldset); remove_ofname_fd = -1; - unlink_errno = xunlink (ifname) == 0 ? 0 : errno; + if (remove_ifname) + unlink_errno = xunlink (ifname) == 0 ? 0 : errno; sigprocmask (SIG_SETMASK, &oldset, NULL); if (unlink_errno)
