Linux viewing logs

1, must first understand the two most basic command:

Tail-n test.log query log at the end of the last 10 lines;

Tail-n +10 test.log Query all logs after 10 lines;

Head-n test.log Query log file in the first 10 rows of logs;

Head-n -10 test.log query log file except for all other logs in the last 10 lines;

2, command grep to filter information, by command CAT/ETC/PASSWD | grep Thomas from the passwd file to quickly find the content of Thomas information. by Command CAT/ETC/PASSWD | Grep–n tcpdump quickly find the contents of the Tcpdump information from the passwd file and display the travel number, parameter-V is reversed, as the above 2 examples find information that does not include Thomas and tcpdump information, we pass the man grep can learn more about how to use parameters.

Linux viewing logs