admin:linux:cli:strace [~wiki]

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====== strace (Stack Trace) ======
Important parameters:

^ ''-o filename'' | output to file ''filename'' |
^ ''-f'' | check forks |
^ ''-tt'' | protocol time (microseconds) |
^ ''-p pid'' | only protocol system calls with PID ''pid'' |
^ ''-e'' | limit output, see below |

==== Which files get accessed by the program? ====
<code bash>strace -e trace=open -o logfile.log ./mycommand -mycommandparameter</code>

==== Which processes get started/paused/terminated by the program? ====
<code bash>strace -e trace=process -o logfile.log ./mycommand -mycommandparameter</code>

==== protocol syscalls of already started programs ====
<code bash>
ps aux | grep mycommand | grep -v grep mycommand
strace -o logfile.log -p 123

# if there's only one program running with that name:
strace -o logfile.log -p `pidof mycommand`
</code>