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Old 03-06-2010, 11:35 PM   #1
Jason7449
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Registered: Mar 2010
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Question Help Needed - How to count an item in a tab-delimited txt file?


Hi, I got a question and need some help:

in a tab-delimited file, such as:
Code:
1	11	a	I	ab
2	22	b	II	bc
3	33	c	III	cd
4	33	d	IV	de
5	55	e	V	ef
6	66	f	VI	fg
7	77	g	VII	gh
8	88	h	VIII	hi
how can I count the number of occurrence of an item, such as 33 (twice)?

Thank you very much for your help!
 
Old 03-07-2010, 12:05 AM   #2
simitra
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Hi Jason,

you may not be very familiar with cool linux command line stuff.

I think the following will do the trick

cat fileName | awk '{if ($2 == 33) print $2};' | wc -l

What this does is first print the file, cat fileName
pipe the result of that file to awk, a command line programming language

awk '{if ($2 == 33) print $2};'

checks if the second column is 33, the value u want, if it is, print it. (otherwise ignore)
similarily, $1 is first column, $4 is fourth column, $0 is entire line.

finally, use wc -l to check the number of lines, the number of occurrence of the number you want.

hope it helps
Simitra

Last edited by simitra; 03-07-2010 at 12:07 AM.
 
Old 03-07-2010, 06:36 AM   #3
lwasserm
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Location: Baltimore Md
Distribution: ubuntu
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grep -o "occurrence" sourcefile|wc -l
 
Old 03-07-2010, 09:20 AM   #4
Jason7449
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Registered: Mar 2010
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Thank you sooooo much guys!

I am really a newbie in linux, just started learning for couple of days. Hope I can pick it up without too much struggles.
 
  


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