tail from the last occurrence of a pattern to the end of the (log) file

grep -n PATTERN /logs/somelog.log | cut -f1 -d: | tail -1 | xargs -I num tail -n +num /logs/somelog.log
I wanted a method to display the last run of my script from my log file. I had a pattern I could grep for to find the beginning of each run. This command line greps for that pattern in the log, finds the last occurrence and gives me the line number. Then I use the line number in tail to give me everything from that line number to the end of the log file. I tested this on Linux Mint (variant of Ubuntu) and on RHEL, but I suspect it will run many Linux systems.

0
By: goeltzec
2016-07-29 15:47:26

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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