deleting top ten and bottom ten lines of a text file using a script 1

[tempsup]

Hi to all,

I got a problem with scripts. I got a text file generated by some process and i need to remove the top ten and bottom ten lines. This has to be done using a script so that it can be performed automatically.. I really have no idea what to do. Will some kind hearted souls please help me????

Thanxxx.

 

[Salem]

I think this should help - it uses the ed editor

#!/bin/sh

# prepare a test file
awk 'BEGIN { for ( i = 1 ; i <= 30 ; i++ ) print i }' > tmp

# use ed to remove the last 10 and first 10 lines
ed -s tmp << HERE
^10
.,\$d
1,10d
wq
HERE

--

http://www.catb.org/~esr/faqs/smart-questions.html

 

[dickiebird]

Or just with head and tail ( untested ) :

((count=`cat yourfile|wc -l` -10))
head -"$count" yourfile > tmp1
tail +10 tmp1 > yourfile

HTH


Dickie Bird (-)))

 

[Ygor]

Or with awk...

awk '{a[++x]=$0}END{for(i=10;i<x-10;i++)print a[i+1]>FILENAME}' file1

 

[dickiebird]

Neat solution Ygor - so does ++x force a write to the array, and not an overwrite in the case of duplicates ?

Dickie Bird (-)))

 

[Ygor]

Ooops, I just realised that I don't need x at all, just

awk '{a[NR]=$0}END{for(i=10;i<NR-10;i++)print a[i+1]>FILENAME}' file1

 

[tempsup]

Hey guys, thanxxx for all your help. Couldn't hav done it without your!!