[SOLVED] Why can't me execute a symbolic link : "No such file or directory"
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Why can't me execute a symbolic link : "No such file or directory"
Assume the directory I locate is /mypath/bin/ , there exists a file named "ccache"
Then I execute ccache:
[saturn@21004872 bin]$ ./ccache
ccache, a compiler cache. Version 2.4
Copyright Andrew Tridgell, 2002
ccache compiler [compile options]
compiler [compile options] (via symbolic link)
-s show statistics summary
-z zero statistics
-c run a cache cleanup
-C clear the cache completely
-F <maxfiles> set maximum files in cache
-M <maxsize> set maximum size of cache (use G, M or K)
-h this help page
-V print version number
ccache tries to guess what to execute as by looking at the command line invocation. You're running it as 'mycc' but that compiler (presumably) doesn't exist on your system. You can set CCACHE_CC to some valid compiler and then invoke it as './mycc'.
Sorry, I don't know what you mean, since mycc links to ccache, then I think ./mycc equals to ./ccache.
And I don't what can I set to CCACHE_CC .
The command " export CCACHE_CC=gcc " doesn't solve problem.
Well, the only thing I can think of is that gcc isn't installed. If not that, sorry, and hopefully someone else can help.
I don't know if it's the issue at hand, but some binaries and scripts will behave differently depending no the name you use to call them, a typical example is busybox. A simple example so you get what I mean.
$ which busybox
BusyBox v1.17.1 (2010-08-17 09:57:50 CEST) multi-call binary.
Copyright (C) 1998-2009 Erik Andersen, Rob Landley, Denys Vlasenko
and others. Licensed under GPLv2.
See source distribution for full notice.
Usage: busybox [function] [arguments]...
or: function [arguments]...
BusyBox is a multi-call binary that combines many common Unix
utilities into a single executable. Most people will create a
link to busybox for each function they wish to use and BusyBox
will act like whatever it was invoked as.
Currently defined functions:
[, [[, acpid, addgroup, adduser, adjtimex, ar, arp, arping, ash, awk, basename, bb, bbconfig, bbsh, beep, blkid, bootchartd, brctl, bunzip2, bzcat, bzip2, cal, cat, catv, chat, chattr, chgrp, chmod, chown,
chpasswd, chpst, chroot, chrt, chvt, cksum, clear, cmp, comm, conspy, cp, cpio, crond, cryptpw, cttyhack, cut, date, dd, deallocvt, delgroup, deluser, depmod, devmem, df, dhcprelay, diff, dirname, dmesg,
dnsdomainname, dos2unix, dpkg-deb, du, dumpkmap, dumpleases, echo, ed, egrep, eject, env, envdir, envuidgid, ether-wake, expand, expr, false, fbset, fdflush, fdformat, fdisk, fgconsole, fgrep, find, findfs,
flash_eraseall, flash_lock, flash_unlock, flashcp, flock, free, freeramdisk, fsck, fsck.minix, fsync, ftpd, fuser, getopt, getty, grep, gunzip, gzip, halt, hd, hdparm, head, hexdump, hostname, httpd, hwclock, id,
ifconfig, ifdown, ifenslave, ifplugd, ifup, init, insmod, install, ionice, ip, ipaddr, ipcrm, ipcs, iplink, iproute, iprule, iptunnel, kbd_mode, kill, killall, killall5, klogd, last, length, less, linux32,
linux64, linuxrc, ln, loadfont, loadkmap, logger, login, logread, losetup, lpq, lpr, ls, lsattr, lsmod, lspci, lsusb, lzcat, lzma, lzop, lzopcat, makedevs, makemime, man, md5sum, mdev, mesg, microcom, mkdir,
mkdosfs, mke2fs, mkfifo, mkfs.ext2, mkfs.minix, mkfs.reiser, mkfs.vfat, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more, mount, mountpoint, mt, mv, nameif, nc, netstat, nice, nmeter, nohup, nslookup,
ntpd, openvt, passwd, patch, pgrep, pidof, ping, ping6, pipe_progress, pivot_root, pkill, popmaildir, poweroff, printenv, printf, ps, pscan, pwd, raidautorun, rdate, rdev, readahead, readlink, readprofile,
realpath, reboot, reformime, renice, reset, resize, rev, rm, rmdir, rmmod, route, rtcwake, run-parts, runlevel, runsv, runsvdir, rx, script, scriptreplay, sed, sendmail, seq, setarch, setconsole, setfont,
setkeycodes, setlogcons, setsid, setuidgid, sh, sha1sum, sha256sum, sha512sum, showkey, sleep, smemcap, softlimit, sort, split, start-stop-daemon, stat, strings, stty, su, sum, sv, svlogd, swapoff, swapon,
switch_root, sync, sysctl, syslogd, tac, tail, tar, tee, telnet, telnetd, test, tftp, tftpd, time, timeout, top, touch, tr, traceroute, traceroute6, true, tty, ttysize, tunctl, tune2fs, ubiattach, ubidetach,
udhcpc, udhcpd, umount, uname, uncompress, unexpand, uniq, unix2dos, unlzma, unlzop, unxz, unzip, uptime, usleep, vconfig, vi, vlock, volname, wall, watch, watchdog, wc, wget, which, who, whoami, xargs, xz,
xzcat, yes, zcat, zcip
$ ln -s /bin/busybox ls
$ ls -l ls
lrwxrwxrwx 1 i92guboj i92guboj 12 sep 16 10:07 ls -> /bin/busybox
COPYING README ccache.1 ccache.h cleanup.c configure execute.c install-sh mdfour.c packaging stats.c unify.c web
Makefile.in args.c ccache.c ccache.yo config.h.in configure.in hash.c ls mdfour.h snprintf.c test.sh util.c
In shell scripts this can be done by checking for the value of $0, or usually $(basename $0), which will hold the name of the command you used to invoke the script. The script can check for that value and act differently depending on such value.