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Count percentage of string

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# 1  
Old 09-03-2014
Count percentage of string
Hi,

Am trying to count the number of occurrences and then as a percentage from a log to troubleshoot errors, can someone help please

Code:
grep -o 'HTTP/1\.1\" 404 3..' access_log | wc -l
6

Last edited by Don Cragun; 09-04-2014 at 06:43 AM.. Reason: Add CODE tags.
# 2  
Old 09-03-2014
This sounds like a homework assignment.
# 3  
Old 09-04-2014
So... Is this a homework assignment?
# 4  
Old 09-04-2014
Of course not!

Im trying to develop an app to read my logs for errors
# 5  
Old 09-04-2014
Code:
awk '/HTTP\/1\.1\" 404 3../ { E++ } END { printf("%d/%d=%d%%\n", E, NR, (E/NR)*100); }' logfile

# 6  
Old 09-04-2014
You must forgive me, but this would make a nice homework question.

It's concise, has escaping RE characters, floating point calculations/rounding and formatting.

Particularly if awk was forbidden. Here is show the percentage to 2 decimal places of precision:

Code:
NUM=$(grep -c  'HTTP/1\.1" 404 3..' access_log)
RECS=$(wc -l < access_log)
printf "Found %d records from %d (%.2f %%)\n" $NUM $RECS $(echo "scale=3 ; $NUM * 100 / $RECS " | bc)

Last edited by Chubler_XL; 09-04-2014 at 05:16 PM..
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