good way to get time data

gistfile1.sh

#!/bin/bash

#strace
# "-e trace=some_syscall" allows you to trace just the syscalls you want.
#                         lotta noise otherwise. comma separated list, but
#                         for our experiments, it'll prolly just be 1
#                         syscall
# "-T" give us time data
#
# "program arg0 arg1" is the program we want to trace. this'll likely be
#                     something we write that does hundreds of a particular
#                     syscall
#                     
# "2>&1" strace outputs to stderr by default. we don't want that because
#        we're processing later to a pipe. this says to redirect to stdout

#grep
# "--extended-grep" use more robust regexp language "--regexp" the pattern
#
# "--only-matching" don't return whole lines, just the match

#>> blah.txt outputs to blah.txt. name this to something more specific like
#            "mkdir_tests.txt" or whatnot.

strace -e trace=some_syscall -T program arg0 arg1 2>&1 | grep --extended-regexp -regexp="[[:digit:]]\.[[:digit:]]+" --only-matching >> blah.txt