Assign Line Numbers to each line of the file


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# 1  
Bug Assign Line Numbers to each line of the file

Hi! I'm trying to assign line numbers to each line of the file
for example consider the following..
The contents of the input file are


Code:
hello how are you?
I'm fine.
How about you?

I'm trying to get the following output..

Code:
1 hello how are you?
2 I'm fine.
3 How about you?

Note:The number has to be followed by a space not a tab..

Any idea of how to do it??
Thanks in advance..
# 2  
Try

Code:
awk '{print NR" "$0}' input_file


Last edited by kumaran_5555; 06-06-2011 at 01:50 PM..
# 3  
Quote:
Originally Posted by abk07
Hi! I'm trying to assign line numbers to each line of the file
for example consider the following..
The contents of the input file are


Code:
hello how are you?
I'm fine.
How about you?

I'm trying to get the following output..

Code:
1 hello how are you?
2 I'm fine.
 
 
3 How about you?

Note:The number has to be followed by a space not a tab..

Any idea of how to do it??
Thanks in advance..

Code:
 
perl -lne 'print "$. $_" input

# 4  
...or, the same in sed:

Code:
sed 's/^/= /' /path/to/infile > /path/to/outfile

I hope this helps.

bakunin
# 5  
Code:
cat -n filename

# 6  
@itkamaraj
The separator in "cat -v" is a tab character.
# 7  
Code:
$ nl -nln -s\   infile

If you need to reduce the default numwidth, use the -w option:

Code:
$ nl -nln -s\  -w2  infile
1  hello how are you?
2  I'm fine.
3  How about you?


Last edited by radoulov; 06-06-2011 at 01:44 PM..
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