> I thought that most modern shells had some kind of command to dereference
> symbolic links like 'truename' or 'realname' or something like that.
None do, but one is trivial to write given the presence of realpath(3).
Here's one, minimally tested:
/*
* realpath -- canonicalize pathnames, resolving symlinks
*
* usage: realpath [-csv] pathname [pathname...]
*
* options: -c check whether or not each resolved path exists
* -s no output, exit status determines whether path is valid
* -v produce verbose output
*
*
* exit status: 0 if all pathnames resolved
* 1 if any of the pathname arguments could not be resolved
*
* Chet Ramey
* [EMAIL PROTECTED]
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#ifndef PATH_MAX
# define PATH_MAX 1024
#endif
#ifndef errno
extern int errno;
#endif
extern int optind;
extern char *optarg;
static char *progname;
static void
usage()
{
fprintf(stderr, "%s: usage: %s [-csv] pathname [pathname...]\n", progname,
progname);
exit(2);
}
main(c, v)
int c;
char **v;
{
int opt, cflag, vflag, sflag, es;
char *r, realbuf[PATH_MAX];
struct stat sb;
if (progname = strrchr(v[0], '/'))
progname++;
else
progname = v[0];
vflag = cflag = sflag = 0;
while ((opt = getopt (c, v, "csv")) != EOF) {
switch (opt) {
case 'c':
cflag = 1;
break;
case 's':
sflag = 1;
break;
case 'v':
vflag = 1;
break;
default:
usage();
}
}
c -= optind;
v += optind;
if (c == 0)
usage();
for (opt = es = 0; opt < c; opt++) {
r = realpath(v[opt], realbuf);
if (r == 0) {
es = 1;
if (sflag == 0)
fprintf(stderr, "%s: %s: cannot resolve: %s\n",
progname, v[opt], strerror(errno));
continue;
}
if (cflag && (stat(realbuf, &sb) < 0)) {
es = 1;
if (sflag == 0)
fprintf(stderr, "%s: %s: %s\n", progname, v[opt],
strerror(errno));
continue;
}
if (sflag == 0) {
if (vflag)
printf ("%s -> ", v[opt]);
printf("%s\n", realbuf);
}
}
exit(es);
}
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet)
Chet Ramey, CWRU [EMAIL PROTECTED] http://cnswww.cns.cwru.edu/~chet/
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