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I have a log file. For every line with a specific number, I want to sum the last number of those lines. To grep and cut is no problem but I don't know how to sum the numbers. I tried some solutions from StackExchange but didn't get them to work in my case.

This is what I have so far:

grep "30201" logfile.txt | cut -f6 -d "|"

30201 are the lines I'm looking for.

I want to sum the last numbers 650, 1389 and 945

The logfile.txt

Jan 09 2016|09:15:17|30201|1|SL02|650
Jan 09 2016|09:15:18|43097|1|SL01|945
Jan 09 2016|09:15:19|28774|2|SB03|1389
Jan 09 2016|09:16:21|00788|1|SL02|650
Jan 09 2016|09:17:25|03361|3|SL01|945
Jan 09 2016|09:17:33|08385|1|SL02|650
Jan 09 2016|09:18:43|10234|1|SL01|945
Jan 09 2016|09:21:55|00788|1|SL02|650
Jan 09 2016|09:24:43|03361|3|SB03|1389
Jan 09 2016|09:26:01|30201|1|SB03|1389
Jan 09 2016|09:26:21|28774|2|SL02|650
Jan 09 2016|09:26:25|00788|1|SL02|650
Jan 09 2016|09:27:21|28774|2|SL02|650
Jan 09 2016|09:29:32|30201|1|SL01|945
Jan 09 2016|09:30:12|34032|1|SB03|1389
Jan 09 2016|09:30:15|08767|3|SL02|650

You can take help from paste to serialize the numbers in a format suitable for bc to do the addition:

% grep "30201" logfile.txt | cut -f6 -d "|"
650
1389
945

% grep "30201" logfile.txt | cut -f6 -d "|" | paste -sd+
650+1389+945

% grep "30201" logfile.txt | cut -f6 -d "|" | paste -sd+ | bc
2984

If you have grep with PCRE, you can do it with grep alone using postive lookbehind:

% grep -Po '|30201|.*|Kd+' logfile.txt | cut -f6 -d "|" | paste -sd+ | bc
2984

With awk alone:

% awk -F'|' '$3 == 30201 sum+=$NF; ENDprint sum' logfile.txt 
2984

• 
  -F'|' sets the field separator as |
  


• 
  $3 == 30201 sum+=$NF adds up the last field's values if the third field is 30201
  


• 
  ENDprint sum prints the sum at the END
  

Bash solution.

#!/bin/bash
pa=0 ; s=0 ; 
while read a b ; do 
 if [ "$a" == "$pa" ] ; then 
 s=$(($s+$b)) ; 
 else 
 if [ "$pa" != 0 ] ; then 
 echo $pa $s ; 
 fi ; 
 pa=$a ; s=$b ; 
 fi ; 
done < <(cat j.txt | awk -F'|' 'printf("%s %sn",$3,$6)' | sort -n) 
echo $pa $s

Init Previous A and SUM

Cut down the input to fields 3 and 6 and sort them by number

Loop as long as field 3 stays the same, add field 6 to the SUM

if field 3 changes but the Previous A is not 0, output the Previous A and the SUM and reinit Previous A to a and SUM to last field 6 read.

Output last Previous A and SUM.

Output of the given input:

00788 1950
03361 2334
08385 650
08767 650
10234 945
28774 2689
30201 2984
34032 1389
43097 945

There is nothing really wrong with your grep and cut command. You could make it more robust by using "|30201|" as the search pattern. The issue then is dealing with the output.

Using bash:

#!/bin/bash
# get the output as a bash array and add the elements
nums=( $(grep "|30201|" logfile.txt | cut -f6 -d "|") )
total=0

for i in $!nums[@]
 do
 total=$(($total+$nums[i]))
 done
echo $total

One little tool I keep around I call sumcol

#!/bin/sh
# Icarus Sparry. Free for any use.
C=$1:?"missing required column number"
shift
awk 's+=$'"$C"' END print s ' "$@"

which adds up the whitespace delimited column you provide. Whilst I would write (as @heemayl does)

awk -F'|' '$3 == 30201 s+=$6 END print s' logfile.txt

for the OP's problem, he could use

grep "30201" logfile.txt | cut -f6 -d "|" | sumcol 1

or

grep "30201" logfile.txt | tr "| " " _" | sumcol 6