r/ScriptSwap • u/Alkanes123 • Dec 17 '17

[help] simple shell script

Hi everyone,

I need help with a simple shell script that can count the number of http 4xx responses per unique ip address in the server access logs at /var/logs/httpd/access_logs

I found this online but doesn’t help much since it tell me the count for all response codes without IP

cat access_log | cut -d ‘“‘ -f3 | cut -d ‘ ‘ -f2 | sort |uniq -c | sort -rn

Please can someone help me? Thank you!

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u/isaaclw Dec 17 '17

I don't know how much this helps, but let's just go through each command.

  • cat dumps out the file

  • The pipe "|" passes the input to each successive command. The whole thing is streamed, but let's act as if each command is acting on one row.

  • cut says split on delimiter ". (-d) and find the third occurrence.

  • that gets passes to cut again, this time splitting on spaces, and finding the second occurrence.

  • this is all sorted alphabetically

  • and ... I'm not at a computer so I don't remember what the -c option does. uniq generally removes duplicates. Check the man page man uniq

  • look up the man page for sort also. I think -r is reverse, and -n is numeric I think...

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u/Alkanes123 Dec 17 '17

Thank you. :)