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Old 10-13-2003, 03:02 AM   #1
ganninu
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Registered: Jul 2003
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Display/Read line 'N' in a text file using script


I was just wondering if there exists already an inbuilt Linux command to just display a particular line or range of lines in a text file. I normally use a "for" loop for this kind of thing and works well.
 
Old 10-13-2003, 05:20 AM   #2
iainr
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There may be a more elegant way, but if, for example, I wanted to display lines 23-30 I would use

head -30 <file> | tail -8

Or more generally, in a script

FIRST_LINE=$1
LAST_LINE=$2
typeset -i NUM_LINES=$LAST_LINE-$FIRST_LINE+1
head -$LAST_LINE|tail -$NUM_LINES

(I only just tried this code in ksh so apologies if it needs to be tweaked for bash).

Iain.
 
Old 10-13-2003, 05:28 AM   #3
ganninu
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very elegant technique indeed...
 
  


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