$gdb /bin/ls
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Reading symbols from /bin/ls...Reading symbols from /usr/lib/debug/.build-id/d8/8582ece1631fd6d00210f2b98e1675dff8a222.debug...done.
done.
(gdb) break 1250
Breakpoint 1 at 0x39e7: file src/ls.c, line 1250.
(gdb) source src/ls.c
src/ls.c: No such file or directory.
(gdb) source ls.c
ls.c:1: Error in sourced command file:
Undefined command: "". Try "help".
(gdb) r
Starting program: /bin/ls
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Breakpoint 1, main (argc=1, argv=0x7fffffffe228) at src/ls.c:1285
warning: Source file is more recent than executable.
1285 set_program_name (argv[0]);
(gdb) next
1249 {
(gdb) next
1285 set_program_name (argv[0]);
(gdb) l
1280 #if ! SA_NOCLDSTOP
1281 bool caught_sig[nsigs];
1282 #endif
1283
1284 initialize_main (&argc, &argv);
1285 set_program_name (argv[0]);
1286 setlocale (LC_ALL, "");
1287 bindtextdomain (PACKAGE, LOCALEDIR);
1288 textdomain (PACKAGE);
1289
(gdb) next
1286 setlocale (LC_ALL, "");
(gdb) next
1287 bindtextdomain (PACKAGE, LOCALEDIR);
(gdb) next
1288 textdomain (PACKAGE);
(gdb) print PACKAGE
No symbol "PACKAGE" in current context.
(gdb) next
1291 atexit (close_stdout);
(gdb) print PACKAGE
No symbol "PACKAGE" in current context.
(gdb) next
1290 initialize_exit_failure (LS_FAILURE);
(gdb) next
1291 atexit (close_stdout);
(gdb) next
1300 current_time.tv_sec = TYPE_MINIMUM (time_t);
(gdb) c
Continuing.
[ df.o id.c nproc seq.c tee.c
arch dir id.o nproc.c seq.o tee.o
base32 dircolors install.c nproc.o set-fields.c test
base64 dircolors.c ioblksize.h numfmt set-fields.h test.c
base64.c dircolors.h join numfmt.c set-fields.o test.o
basename dircolors.hin join.c numfmt.o sha1sum timeout
basename.c dircolors.o join.o od sha224sum timeout.c
basename.o dirname kill od.c sha256sum timeout.o
cat dirname.c kill.c od.o sha384sum touch
cat.c dirname.o kill.o operand2sig.c sha512sum touch.c
cat.o du lbracket.c operand2sig.h shred touch.o
chcon du.c lbracket.o operand2sig.o shred.c tr
chcon.c du.o libstdbuf.c paste shred.o tr.c
chcon.o echo libstdbuf.so paste.c shuf tr.o
chgrp echo.c libver.a paste.o shuf.c true
chgrp.c echo.o link pathchk shuf.o true.c
chgrp.o env link.c pathchk.c single-binary.mk true.o
chmod env.c link.o pathchk.o sleep truncate
chmod.c env.o ln pinky sleep.c truncate.c
chmod.o expand ln.c pinky.c sleep.o truncate.o
chown expand.c ln.o pinky.o sort tsort
chown.c expand.o local.mk pr sort.c tsort.c
chown-core.c expr logname pr.c sort.o tsort.o
chown-core.h expr.c logname.c primes.h split tty
chown-core.o expr.o logname.o printenv split.c tty.c
chown.o extent-scan.c longlong.h printenv.c split.o tty.o
chroot extent-scan.h ls printenv.o src_base32-base64.o uname
chroot.c extent-scan.o ls.c printf src_base64-base64.o uname-arch.c
chroot.o extract-magic ls-dir.c printf.c src_ginstall-copy.o uname-arch.o
cksum factor ls-dir.o printf.o src_ginstall-cp-hash.o uname.c
cksum.c factor.c ls.h pr.o src_ginstall-extent-scan.o uname.h
cksum.o factor.o ls-ls.c prog-fprintf.c src_ginstall-install.o uname.o
comm false ls-ls.o prog-fprintf.h src_ginstall-prog-fprintf.o uname-uname.c
comm.c false.c ls.o prog-fprintf.o src_ginstall-selinux.o uname-uname.o
comm.o false.o ls-vdir.c ptx src_libstdbuf_so-libstdbuf.o unexpand
copy.c fiemap.h ls-vdir.o ptx.c src_md5sum-md5sum.o unexpand.c
copy.h find-mount-point.c make-prime-list ptx.o src_sha1sum-md5sum.o unexpand.o
copy.o find-mount-point.h make-prime-list.c pwd src_sha224sum-md5sum.o uniq
coreutils-arch.c find-mount-point.o make-prime-list.o pwd.c src_sha256sum-md5sum.o uniq.c
coreutils.c fmt md5sum pwd.o src_sha384sum-md5sum.o uniq.o
coreutils-dir.c fmt.c md5sum.c readlink src_sha512sum-md5sum.o unlink
coreutils.h fmt.o mkdir readlink.c stat unlink.c
coreutils-vdir.c fold mkdir.c readlink.o stat.c unlink.o
cp fold.c mkdir.o realpath stat.o uptime
cp.c fold.o mkfifo realpath.c stdbuf uptime.c
cp-hash.c fs.h mkfifo.c realpath.o stdbuf.c uptime.o
cp-hash.h fs-is-local.h mkfifo.o relpath.c stdbuf.o users
cp-hash.o getlimits mknod relpath.h stty users.c
cp.o getlimits.c mknod.c relpath.o stty.c users.o
csplit getlimits.o mknod.o remove.c stty.o vdir
csplit.c ginstall mktemp remove.h sum version.c
csplit.o group-list.c mktemp.c remove.o sum.c version.h
cu-progs.mk group-list.h mktemp.o rm sum.o version.o
cut group-list.o mv rm.c sync wc
cut.c groups mv.c rmdir sync.c wc.c
cut.o groups.c mv.o rmdir.c sync.o wc.o
date groups.o nice rmdir.o system.h who
date.c head nice.c rm.o tac whoami
date.o head.c nice.o runcon tac.c whoami.c
dcgen head.o nl runcon.c tac.o whoami.o
dd hostid nl.c runcon.o tac-pipe.c who.c
dd.c hostid.c nl.o selinux.c tail who.o
dd.o hostid.o nohup selinux.h tail.c yes
df hostname.c nohup.c selinux.o tail.o yes.c
df.c id nohup.o seq tee yes.o
[Inferior 1 (process 13843) exited normally]
(gdb)