ltrace – narzędzie analizy kodu badające interakcję programu z używanymi przez niego bibliotekami dzielonymi (shared libraries).
Przykład wykonania dla trywialnego programu /bin/true:
$ ltrace /bin/true
__libc_start_main(0x8048a50, 1, 0xbffff434, 0x80499f0, 0x8049a50 <unfinished ...>
setlocale(6, "") = "en_US.UTF-8"
bindtextdomain("coreutils", "/usr/share/locale") = "/usr/share/locale"
textdomain("coreutils") = "coreutils"
__cxa_atexit(0x8048b60, 0, 0, 0xbffff434, 0x41152190) = 0
exit(0 <unfinished ...>
__fpending(0x41149d20, 0x804b254, 0x41152190, 0xbffff3c0, 0xbffff378) = 0
+++ exited (status 0) +++
$ ltrace /bin/chmod 0777 xxx
__libc_start_main(0x80492f0, 3, 0xbffff424, 0x804b120, 0x804b180 <unfinished ...>
setlocale(6, "") = "en_US.UTF-8"
bindtextdomain("coreutils", "/usr/share/locale") = "/usr/share/locale"
textdomain("coreutils") = "coreutils"
__cxa_atexit(0x8049720, 0, 0, 0, 0x41152190) = 0
getopt_long(3, 0xbffff424, "RcfvrwxXstugoa,+-=", 0x804b3c0, NULL) = -1
__ctype_b_loc(0x4000019c, 0x40000e90, 1, 0x41016c40, 35) = 0x40011444
__errno_location() = 0x40011440
__strtoul_internal("0777", 0xbffff308, 8) = 511
malloc(16) = 0x804d858
__xstat64(3, "xxx", 0xbffff2f0) = 0
chmod("xxx", 0777) = 0
__errno_location() = 0x40011440
exit(0 <unfinished ...>
__fpending(0x41149d20, 131072, 0, 0, 0x40f33423) = 0
+++ exited (status 0) +++