topic Re: extracting specific line from text in Operating System - HP-UX

extracting specific line from text

Henry Chua — Thu, 21 Apr 2005 01:57:00 GMT

Hi Guys,

Say I want to extract line 2 from a text log, what is the best way to do it using shell?
Thanks

Best regards
Henry

Re: extracting specific line from text

Alex Lavrov. — Thu, 21 Apr 2005 02:00:24 GMT

head -2 | tail -1

Re: extracting specific line from text

Peter Godron — Thu, 21 Apr 2005 02:05:57 GMT

Henry,
you do not specify the selection criteria for your extract (top of the file,end of the file....)

If you want to extract lines 12 and 13 of a file for example you can use
sed -n '12,13' file.lis

For top 2 lines:
head -2 file.lis

For last 2 lines:
tail -2 file.lis

Can you please update with more details.
Regards

Re: extracting specific line from text

Alex Lavrov. — Thu, 21 Apr 2005 02:10:02 GMT

Another one I came up with:

cat -n | awk '$1 ~ ln {print $0}' ln=

For example:

cat -n /tmp/my_test.txt | awk '$1 ~ ln {print $0}' ln=28

Re: extracting specific line from text

Indira Aramandla — Thu, 21 Apr 2005 02:17:02 GMT

Hi Henry,

To list lines 2 through 8 of a file

In awk ----> awk 'NR>=2 && NR <=8'

In sed ----> sed -n -e 2,8p filename

In perl ----> perl -ne 'print unless (($.<2) or ($.>8));' filename

In your case to extract line 2

sed -n -e 2,2p filename

IA

Re: extracting specific line from text

Henry Chua — Thu, 21 Apr 2005 02:58:42 GMT

Thanks guys, got the answer I want..
Alex first solution is brilliant.. short but handy..

THanks!!