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Full Discussion: Parse apache log file with three different time formats
Top Forums UNIX for Beginners Questions & Answers Parse apache log file with three different time formats Post 303038328 by stomp on Friday 30th of August 2019 02:08:03 PM
Old 08-30-2019
If the logs are very big it may be a good trick to read them backwards, because maybe the interesting part is more likely at the end of the file, so we maybe save to read tons of old lines that way:

Code:
#!/bin/sh
logfile="$3"

# reverse at the beginning to read from end to start
tac "$logfile" | awk -vstart="$1" -vend="$2" ' 

BEGIN {
        start_epoch = mktime(start)
        end_epoch   = mktime(end)
}

function monthnumber(monthname) {
        return sprintf("%02d\n",(match("JanFebMarAprMayJunJulAugSepOctNovDec",monthname)+2))/3
}

match($0,/^([0-9]+)\/([a-zA-Z]+)\/([0-9]{4}):([0-9]{2}):([0-9]{2}):([0-9]{2})/,r) { 
        current=mktime( sprintf("%s %s %s %s %s %s", r[3],monthnumber(r[2]),r[1],r[4],r[5],r[6])); }

match($0,/^[a-zA-Z]+ ([a-zA-Z]+) ([0-9]+) ([0-9]+):([0-9]+):([0-9]+) ([0-9]{4})/,r) { 
        current=mktime( sprintf("%s %s %s %s %s %s", r[6],monthnumber(r[1]),r[2],r[3],r[4],r[5])); }

match($0,/^([0-9]+)-([a-zA-Z]+) ([0-9]+):([0-9]+):([0-9]+)/,r) { 
        current=mktime( sprintf("%s %s %s %s %s %s", strftime("%Y"),monthnumber(r[2]),r[1],r[3],r[4],r[5])); } 

# we have to swap the actions here!
(current < start_epoch) { exit }
(current > end_epoch  ) { next }

1
' | tac 
# and reverse again at the end to return to chronological order

Script call stays the same.
Last edited by stomp; 08-30-2019 at 06:57 PM..
 

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set_color(1)							       fish							      set_color(1)

NAME

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set_color - set the terminal color
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   Description
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