*BASH User Commands Ubuntu 10.04.4 LTS Server coreutils
ltrace(1)                                                            ltrace(1)

       ltrace - A library call tracer

       ltrace [-CfhiLrStttV] [-a column] [-A maxelts] [-D level] [-e expr] [-l
       filename] [-n nr] [-o filename] [-p pid] ... [-s strsize] [-u username]
       [-X  extern] [-x extern] ... [--align=column] [--debug=level] [--deman-
       gle] [--help]  [--indent=nr]  [--library=filename]  [--output=filename]
       [--version] [command [arg ...]]

       ltrace  is  a  program  that simply runs the specified command until it
       exits.  It intercepts and records the dynamic library calls  which  are
       called  by  the  executed process and the signals which are received by
       that process.  It can also intercept and print the  system  calls  exe-
       cuted by the program.

       Its use is very similar to strace(1).

       -a, --align column
              Align  return values in a specific column (default column is 5/8
              of screen width).

       -A maxelts
              Maximum number of array elements to print before suppressing the
              rest with an ellipsis ("...")

       -c     Count  time and calls for each library call and report a summary
              on program exit.

       -C, --demangle
              Decode (demangle) low-level symbol names into user-level  names.
              Besides  removing any initial underscore prefix used by the sys-
              tem, this makes C++ function names readable.

       -D, --debug level
              Show debugging output of ltrace itself.  level must be a sum  of
              some of the following numbers:

              01     DEBUG_GENERAL.  Shows helpful progress information

              010    DEBUG_EVENT.  Shows every event received by a traced pro-

              020    DEBUG_PROCESS.  Shows every action ltrace carries upon  a
                     traced process

              040    DEBUG_FUNCTION.  Shows every entry to internal functions

       -e expr
              A  qualifying  expression  which modifies which events to trace.
              The format of the expression is:
              where the values are the functions to trace.  Using an  exclama-
              tion  mark  negates  the  set  of values.  For example -e printf
              means to trace only the printf library call.   By  contrast,  -e
              !printf means to trace every library call except printf.

              Note  that  some  shells  use  the exclamation point for history
              expansion; even inside quoted arguments.  If so, you must escape
              the exclamation point with a backslash.

       -f     Trace  child  processes  as they are created by currently traced
              processes as a result of the fork(2) or clone(2)  system  calls.
              The new process is attached immediately.

       -F     Load  an  alternate  config file. Normally, /etc/ltrace.conf and
              ~/.ltrace.conf will be read (the latter only if it exists).  Use
              this option to load the given file or files instead of those two
              default files.

       -h, --help
              Show a summary of the options to ltrace and exit.

       -i     Print the instruction pointer at the time of the library call.

       -l, --library filename
              Display only the symbols included in the library  filename.   Up
              to  30  library names can be specified with several instances of
              this option.

       -L     DON'T display library calls (use it with the -S option).

       -n, --indent nr
              Indent trace output by nr number of spaces for each  new  nested
              call.  Using  this  option  makes the program flow visualization
              easy to follow.

       -o, --output filename
              Write the trace output to  the  file  filename  rather  than  to

       -p pid Attach to the process with the process ID pid and begin tracing.

       -r     Print  a  relative  timestamp with each line of the trace.  This
              records the time difference between the beginning of  successive

       -s strsize
              Specify the maximum string size to print (the default is 32).

       -S     Display system calls as well as library calls

       -t     Prefix each line of the trace with the time of day.

       -tt    If given twice, the time printed will include the microseconds.

       -ttt   If  given thrice, the time printed will include the microseconds
              and the leading portion will be printed as the number of seconds
              since the epoch.

       -T     Show   the   time  spent inside each call. This records the time
              difference between the beginning and the end of each call.

       -u username
              Run command with the userid, groupid and supplementary groups of
              username.   This  option is only useful when running as root and
              enables the correct execution of setuid and/or setgid binaries.

       -X extern
              Some architectures need to know where to set a  breakpoint  that
              will  be  hit after the dynamic linker has run.  If this flag is
              used, then the breakpoint is set at extern,  which  must  be  an
              external  function.   By  default, '_start' is used.  NOTE: this
              flag is only available on the architectures that need it.

       -x extern
              Trace  the  external  function  extern.   This  option  may   be

       -V, --version
              Show the version number of ltrace and exit.

       It has most of the bugs stated in strace(1).

       Manual page and documentation are not very up-to-date.

       Option -f sometimes fails to trace some children.

       It only works on Linux and in a small subset of architectures.

       Only ELF32 binaries are supported.

       Calls to dlopen()ed libraries will not be traced.

       If  you  would like to report a bug, send a message to the mailing list
       (ltrace-devel@lists.alioth.debian.org), or use the reportbug(1) program
       if you are under the Debian GNU/Linux distribution.

              System configuration file

              Personal config file, overrides /etc/ltrace.conf

       Juan Cespedes <cespedes@debian.org>

       strace(1), ptrace(2)