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2004/10/24 cmp

Some material is very old and may be incorrect today

© October 2004 Tony Lawrence

I often forget about "cmp" and use "diff" when all I really want to know is if two files are the same:

cmp -s file1 file2 || echo "Not the same"

Often the reason for the comparison is that I've written something like this:

touch /tmp/testdirb.$$
while :
  ls /testdir > /tmp/testdira.$$
  cmp -s /tmp/testdira.$$ /tmp/testdirb.$$ || echo "changed"
  cp /tmp/testdira.$$ /tmp/testdirb.$$
  sleep 300

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Inexpensive and informative Apple related e-books:

Take Control of Automating Your Mac

Take Control of IOS 11

Take Control of the Mac Command Line with Terminal, Second Edition

Photos for Mac: A Take Control Crash Course

iOS 8: A Take Control Crash Course

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