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Assign Line Numbers to each line of the file

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# 1  
Old 06-06-2011
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  
Old 06-06-2011
Try

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

Last edited by kumaran_5555; 06-06-2011 at 12:50 PM..
# 3  
Old 06-06-2011
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  
Old 06-06-2011
...or, the same in sed:

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

I hope this helps.

bakunin
# 5  
Old 06-06-2011
Code:
cat -n filename

# 6  
Old 06-06-2011
@itkamaraj
The separator in "cat -v" is a tab character.
# 7  
Old 06-06-2011
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 12:44 PM..
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