[strace/strace] tracing all children of an already started program. (#193)

[tryauuum]

for anyone reading this: even though `pgrep` doesn't support getting a list of all process's descendants, maybe for your use case matching by process group id will be perfect.
```
strace -f $( pgrep -g PID_OF_ANCESTOR | sed 's!^!-p !' )
```

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