Tag: Commands

Linux – How to cut a log file based on timestamp

You can use the command ‘sed’ to specify an interval to cut a log file. ‘sed’ performs editing operations on information coming from standard input or a file. It edits line-by-line and in a non-interactive way.

Example to cut a log file based on timestamp:

sed '1,/2017\/01\/11 09\:00/ d;/2017\/01\/11 10\:00/,$ d' <logfile>

This command will just show lines between ‘2017/01/11 09:00’ and ‘2017/01/11 10:00’.
In reality, the command is removing all lines before ‘2017/01/11 09:00’ and after ‘2017/01/11 10:00’ (including lines with ‘2017/01/11 10:00’).

You need to modify the command to match your log file and your needs.