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logging errors

Posted on 2015-02-22
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Last Modified: 2015-02-23
folks

how does one trigger a log file(i.e. capture.log)  to capture specific errors from another log file (system.log) the moment they occur?

the system log file is a system generated log file
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Question by:rutgermons
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4 Comments
 
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Expert Comment

by:Benjamin MOREAU
ID: 40624652
Just do that :

your_command > log-ok-file.log 2> log-error.log

log-ok-file.log will log all your command result
log-error.log will only log errors
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Expert Comment

by:Benjamin MOREAU
ID: 40624658
..maybe i have not understood your question... you want to "tail" a log file in real time ? And export some errors ?

If yes, you can use Powershell with something like this :

Get-Content myTestLog.log -wait | where { $_ -match “WARNING” } |out-file log.txt -append

This script will read in realtime your log file & export errors with 'warning" on an other log file.
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Author Comment

by:rutgermons
ID: 40624681
ah, brilliant!  mind me asking, can this also filter warnings logged within a certain time stamp?

each warning or error contains a date and timestamp so ideally i dont want to see older warnings, only new ones

cheers
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Benjamin MOREAU earned 500 total points
ID: 40624701
Get-Content myTestLog.log -tail 0 -wait | where { $_ -match “WARNING” } |out-file log.txt -append

Adding -"tail 0" will read from the end of file....so only new events ;)
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