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What’s the popular tool people use in Unix to parse/analyze log files? Doing counting, find unique, select/copy certain line which have certain patterns. Please advise some tools or some keyword. Since I believe there must be similar questions asked before, but I don’t any idea about the keywords. Thanks.
For regular, nightly checking there is logwatch which have several different scripts in
/usr/share/logwatch/scripts/servicesthat check for specific things (like web server stuff, ftp server stuff, sshd related stuff, etc) in syslog. Default install enables most of them, but you are able to enable/disable as you like or even write your own scripts.For real-time watching there is multitail.