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Commands for finding out if compressed Linux files are the same

Compressed Linux files are helpful because they save disk space, but what should you do when you have a series of compressed files and want to determine if any are duplicates? The zdiff and zcmp commands can help.

To begin, if a directory contains two files like those below, it’s easy to tell just from the listing that they are not identical. After all, the file sizes are a little different. The files look like this:

$ ls -l
total 200
-rw-r–r–. 1 shs shs 102178 Nov 22 2021 2021.gz
-rw-r–r–. 1 shs shs 102181 Nov 22 11:19 2022.gz

If you compare the files with the diff command, it will confirm that the files differ:

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Source:: Network World – Linux