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Roman_Gruber
Advocate
Joined: 03 Oct 2006
Posts: 3846
Location: Austro Bavaria
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 Posted: Thu Dec 17, 2015 6:53 pm Post subject: xmas cleaning, how do i reduce a log file? |
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Hi, I started to clean up my box.
| Code: | ASUS-G75VW log # head emerge.log
1251371551: Started emerge on: Aug 27, 2009 11:12:31
1251371551: *** emerge unmerge dev-util/ccache
1251371552: === Unmerging... (dev-util/ccache-2.4-r7)
1251371553: >>> unmerge success: dev-util/ccache-2.4-r7
1251371553: *** exiting successfully.
1251371553: *** terminating.
1251970835: Started emerge on: Sep 03, 2009 09:40:35
1251970835: *** emerge sync
1251970835: === sync
1251970835: >>> Starting rsync with rsync://81.93.240.111/gentoo-portage
ASUS-G75VW log # ls --full-time emerge.log
-rw-rw---- 1 portage portage 121704700 2015-12-17 19:41:59.916228451 +0100 emerge.log
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How can I keep the data starting from 1st of october 2015 and newer?
I know when i use splat, i need that log file to determine how long it took on the last emerge.
1251371552 <= these are the seconds in the unix time ofc.
--
Pesonally I would use
tail - (some value to choose) emerge.log >> new_log_file
head new_log_file
and do some iterations until i am there but that is just try and error, is there any cleaner approach?
I do not want to backup 120mb which i do not need. Just eats up disk space, slows down backups and aynthign else... |
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VinzC
Watchman
Joined: 17 Apr 2004
Posts: 5098
Location: Dark side of the mood
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| Posted: Mon Dec 21, 2015 12:42 pm Post subject: |
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You could just use date and a regular expression with sed to find the trailing lines that matter to you:
| Code: | date +%s # shows the number of seconds since 1970
date -d '<some valid date>' +%s # shows the number of seconds until the specified date |
For example:
| Code: | | sed -rne '/^'$(date -d 2015-10-01 -%s | sed -re 's/[0-9]{4}$//g')'/,$/p' < emerge.log |
will output only the lines after the first of October this year (2015)... provided you compiled at all on that date. Note I removed the last 4 digits | Code: | | sed -re 's/[0-9]{4}$//g' |
from the date in seconds to account for the day – one day is 86400 seconds so theoretically we should remove the last five digits.
On a final note, I recommend you used logrotate to keep your log size under control.
_________________
Gentoo addict: tomorrow I quit, I promise!... Just one more emerge...
1739! |
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mv
Watchman
Joined: 20 Apr 2005
Posts: 6749
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| Posted: Mon Dec 21, 2015 3:31 pm Post subject: |
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| You could use logclean from the mv overlay which has particular algorithms for e.g. emerge.log |
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