AZ 9901 wrote on 2012-05-31: > 2012/5/31 Jordan : > Then, when (bash) scripting under Cygwin, you must take care to avoid > forking as much as possible. > > You could try to improve the "sleep 1" loop with the following one : > > while md5sum $FILE_TO_CHECK | cut -d " " -f1 | grep -q "^$MD5PRINT$" > do > sleep 1 > done > > Note that MD5PRINTNEW is no more useful here. > With this loop we avoid the fork done by > MD5PRINTNEW=`md5sum $FILE_TO_CHECK | cut -d " " -f1`
Doesn't that just replace the 2 MD5PRINTNEW forks (md5sum and cut) with 3 (md5sum, cut, and grep)? Seems like the (untested) following would be better (in terms of fewer forks): TMPFILE=$(mktemp) md5sum $FILE_TO_CHECK > "$TMPFILE" ... while md5sum -c "$TMPFILE" do sleep 1 done rm "$TMPFILE" -- Bryan Thrall Principal Software Engineer FlightSafety International bryan.thr...@flightsafety.com