md5sum should be able to just output the checksum and nothing else. Of course this
makes little sense when given multiple files, but for stdin or a single file it's
useful and allows md5sum to be used in place of md5. Here's a patch against
textutils-2.0
diff -urN textutils-2.0/doc/textutils.texi textutils-2.0.md5sum.mods/doc/textutils.texi
--- textutils-2.0/doc/textutils.texi Sat Jul 31 10:03:30 1999
+++ textutils-2.0.md5sum.mods/doc/textutils.texi Wed Aug 1 12:27:37 2001
@@ -2029,6 +2029,14 @@
MD5 checksums, exit successfully. Otherwise exit with a status code
indicating there was a failure.
+@item -s
+@itemx --sum
+@cindex outputting only the MD5 sum
+Output only the checksum, omitting the file type and name information. This
+This option is not useful when more than one filename is specified on the
+command line. The output is not suitable for use with the @samp{--check}
+option.
+
@item -t
@itemx --text
@opindex -t
diff -urN textutils-2.0/man/md5sum.1 textutils-2.0.md5sum.mods/man/md5sum.1
--- textutils-2.0/man/md5sum.1 Fri Aug 6 20:24:08 1999
+++ textutils-2.0.md5sum.mods/man/md5sum.1 Wed Aug 1 12:09:56 2001
@@ -21,6 +21,9 @@
\fB\-c\fR, \fB\-\-check\fR
check MD5 sums against given list
.TP
+\fB\-s\fR, \fB\-\-sum\fR
+only output the md5 sums, not the file names or types
+.TP
\fB\-t\fR, \fB\-\-text\fR
read files in text mode (default)
.SS "The following two options are useful only when verifying checksums:"
diff -urN textutils-2.0/src/md5sum.c textutils-2.0.md5sum.mods/src/md5sum.c
--- textutils-2.0/src/md5sum.c Mon May 3 18:55:37 1999
+++ textutils-2.0.md5sum.mods/src/md5sum.c Wed Aug 1 12:19:00 2001
@@ -87,6 +87,7 @@
{ "status", no_argument, 0, 2 },
{ "string", required_argument, 0, 1 },
{ "text", no_argument, 0, 't' },
+ { "sum", no_argument, 0, 's' },
{ "warn", no_argument, 0, 'w' },
{ GETOPT_HELP_OPTION_DECL },
{ GETOPT_VERSION_OPTION_DECL },
@@ -108,6 +109,7 @@
With no FILE, or when FILE is -, read standard input.\n\
\n\
-b, --binary read files in binary mode (default on DOS/Windows)\n\
+ -s, --sum only output the sum(s), not the file names or types\n\
-c, --check check MD5 sums against given list\n\
-t, --text read files in text mode (default)\n\
\n\
@@ -456,6 +458,7 @@
size_t n_strings = 0;
size_t err = 0;
int file_type_specified = 0;
+ int sum_only = 0;
#if O_BINARY
/* Binary is default on MSDOS, so the actual file contents
@@ -472,7 +475,7 @@
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
- while ((opt = getopt_long (argc, argv, "bctw", long_options, NULL)) != -1)
+ while ((opt = getopt_long (argc, argv, "bctsw", long_options, NULL)) != -1)
switch (opt)
{
case 0: /* long option */
@@ -502,6 +505,9 @@
file_type_specified = 1;
binary = 0;
break;
+ case 's':
+ sum_only = 1;
+ break;
case 'w':
status_only = 0;
warn = 1;
@@ -595,31 +601,33 @@
for (i = 0; i < 16; ++i)
printf ("%02x", md5buffer[i]);
- putchar (' ');
- if (binary)
- putchar ('*');
- else
- putchar (' ');
-
- /* Translate each NEWLINE byte to the string, "\\n",
- and each backslash to "\\\\". */
- for (i = 0; i < strlen (file); ++i)
- {
- switch (file[i])
- {
- case '\n':
- fputs ("\\n", stdout);
- break;
-
- case '\\':
- fputs ("\\\\", stdout);
- break;
-
- default:
- putchar (file[i]);
- break;
- }
- }
+ if (!sum_only) {
+ putchar (' ');
+ if (binary)
+ putchar ('*');
+ else
+ putchar (' ');
+
+ /* Translate each NEWLINE byte to the string, "\\n",
+ and each backslash to "\\\\". */
+ for (i = 0; i < strlen (file); ++i)
+ {
+ switch (file[i])
+ {
+ case '\n':
+ fputs ("\\n", stdout);
+ break;
+
+ case '\\':
+ fputs ("\\\\", stdout);
+ break;
+
+ default:
+ putchar (file[i]);
+ break;
+ }
+ }
+ }
putchar ('\n');
}
}
--
Ian Grant, Computer Lab., New Museums Site, Pembroke Street, Cambridge
Phone: +44 1223 334420
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