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head\tail how to display middle lines

 
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# 1  
Old 11-25-2011
head\tail how to display middle lines
hay i need to display middle line:
1
2
3
4
5

how can i display 3-4?
# 2  
Old 11-25-2011
use the steps below:
save txt in a file
$ cat g
1
2
3
4
5
6
$ cat g |fmt|cut -c2-9
2 3 4 5
# 3  
Old 11-25-2011
Chopping the first and last lines from a file is easy:


Code:
sed '1d; $d;' input-file >output-file

# 4  
Old 11-25-2011
Quote:
Originally Posted by Gaurav198
use the steps below:
save txt in a file
$ cat g
1
2
3
4
5
6
$ cat g |fmt|cut -c2-9
2 3 4 5
the #num represent lines
i need to cut lines with different starters and words
i need something like
head -2 filename | tail -4
but i can't seem to get it to work Smilie
# 5  
Old 11-25-2011
you probably think you want:
Code:
tail -4 file | head -2

But from this
Quote:
Originally Posted by margan_ron
i need to cut lines with different starters and words
It looks like sed is your friend:
Code:
sed -n '/begPattern/,/endPattern/ p' file

or
Code:
sed -n '6,/endPattern/ p' file

where 6 is the line number, or other combination of numbers and regex patterns. Use '$' for the last line.
# 6  
Old 11-25-2011
amm..thanks but i still didn't learn it at college. is there a way to do it with: cut\head\tail ??

---------- Post updated at 11:27 PM ---------- Previous update was at 10:19 PM ----------

Quote:
Originally Posted by mirni
you probably think you want:
Code:
tail -4 file | head -2

But from this

It looks like sed is your friend:
Code:
sed -n '/begPattern/,/endPattern/ p' file

or
Code:
sed -n '6,/endPattern/ p' file

where 6 is the line number, or other combination of numbers and regex patterns. Use '$' for the last line.
why can't i use it with var's ?

#!/bin/bash
read x
read z y
sed -n '$z,$y p' $x

maroron@mars~>P3.1
F1
2 4
sed: -e expression #1, char 2: unknown command: `z'
# 7  
Old 11-25-2011
Small script that takes three parameters on the command line: start record, stop record and filename:


Code:
#!/usr/bin/env ksh

awk -v start=${1:-2} -v stop=${2:-3} ' NR >= start && NR <= stop ' $3

If filename is not given, then it reads from stdin.


You can use variables in your sed programme, but you must use double quotes and not single quotes round it:


Code:
read x
 read z y
 sed -n "$z,$y p"  $x

And make sure you have a space between it and the filename ($x)
This User Gave Thanks to agama For This Post:
margan_ron
 
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