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# strace(1)
```markdown
strace [opts] [prg]
-f .......... follow child processes on fork(2)
-p <pid> .... attach to running process
-s <size> ... max string size, truncate of longer (default: 32)
-e <expr> ... expression for trace filtering
-o <file> ... log output into <file>
-c .......... dump syscall statitics at the end
```
```markdown
<expr>:
trace=syscall[,syscall] .... trace only syscall listed
trace=file ................. trace all syscall that take a filename as arg
trace=process .............. trace process management related syscalls
trace=signal ............... trace signal related syscalls
signal ..................... trace signals delivered to the process
```
# Examples
Trace `open(2)` & `socket(2)` syscalls for a running process + child processes:
```markdown
strace -f -e trace=open,socket -p <pid>
```
Trace signals delivered to a running process:
```markdown
strace -f -e signal -p <pid>
```
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