Consider three files each containing one word:

1.txt
2.txt
3.txt

This cat command, cat *.txt, produces the following output:

One
Two
Three

where each word is the one word in the three text files, respectively. Now we need to store this concatenated output in a compressed gzip file:

 cat *.txt | gzip > out.txt.gz

This piping is redirected into a *.gz file that contains one file, out.txt. The assumption here today is that this procedure can be used for apache log files generated by, say, vlogger.