comparing PID values of 2 Files in shell Options Post: 302152280

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trace

trace(1) General Commands Manual trace(1)

Name
trace - trace system calls of programs

Syntax
trace [options] cmd args...

Description
The command with no flag arguments traces for the given cmd and args all system calls made and prints a time stamp, the PID, call and/or
return values and arguments and puts its output in the file trace.dump.

Options
-f filename
Puts dump in file filename.

-z Echos arguments only.

Only one of the following option arguments can be specified at one time.

-c# Traces given PIDs and their children. Up to sixteen PIDs can be specified.

-g# Traces given groups only. Up to sixteen Group IDs can be specified.

-p# Traces given PIDs only. Up to sixteen PIDs can be specified.

-s# Traces given system calls only. Up to sixteen PIDs can be specified.

-u# Traces given UIDs only. Up to sixteen PIDs can be specified.

Examples
trace -f ls.dump ls -l /dev >ls.out
runs the cmd ls -l /dev and puts the trace in ls.dump and output in ls.out.
trace -f csh.trace -p $$ &
will trace your login shell in the background. To stop the trace just send it a termination signal (that is, kill -TERM trace_pid).

Restrictions
Due to security, no one, not even the super-user can trace anyone else's programs. This sort of negates some of the usefulness of the -g
and -u flags.

The program cannot be traced.

Only 16 numbers can be given to the -c, -p, -g, -u, and -s flags.

The kernel configuration file must contain the following:
options SYS_TRACE
pseudo-device sys_trace

In addition, the superuser must use the following command sequence to create the device:
cd /dev
MAKEDEV trace
If both lines are not in the configuration file or if the device is not made, the message "Cannot open /dev/trace" appears.

Files
/dev/trace read only character special device for reading syscall data.

trace.dump default file for the system call trace data.

See Also
open(2), close(2), ioctl(2), select(2), read(2), trace(5)

trace(1)