Use zgrep to grep a gzip (gz) file
Briefly

Linux users quickly learn how to use the Linux grep command on plain text files, but it takes a little longer to really you can grep gzip (gz) files as well.
Unix and Linux systems come with a modified version of grep named zgrep. The Linux zgrep command works just like the grep command, except it works on text files that have been compressed with the gzip command.
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