# # cmp
APLawrence.com -  Resources for Unix and Linux Systems, Bloggers and the self-employed

2004/10/24 cmp

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

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Inexpensive and informative Apple related e-books:

Digital Sharing Crash Course

Take Control of Automating Your Mac

Take Control of iCloud, Fifth Edition

Take Control of IOS 11

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





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It all sounds good from the pulpit,but come Monday morning all the sinners are back to business as usual writing crappy code. (Tony Lawrence)




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