Say you’ve got the following log files with the oldest entries in myapi.log.3.gz:
If you want to ‘grep’ them for a string, in order of date, oldest to newest, there’s no need to extract them one at a time, and there’s no need to concatenate the files first. Use sort to put the files in the proper order, and zgrep to search though the compressed files.
Here’s how to order the file list:
ls myapi.log.*.gz | sort -nr -t . -k 3,3
Here’s how to ‘zgrep’ them in the proper order:
ls myapi.log.*.gz | sort -nr -t . -k 3,3 | xargs zgrep “404”