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edited Apr 13, 2016 at 1:38

In Linux, you have strace:

strace -f sh -c 'grep word1 file > file.txt'

Here we use -f to tell strace to trace child process.

In *BSD, you have dtruss (which use dtrace underlying):

dtruss -f sh -c 'grep word1 file > file.txt'

answered Apr 13, 2016 at 1:32