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Comment lines in file without vi editor

 
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# 1  
Old 04-11-2013
Comment lines in file without vi editor
Legends,

Can you please help me in following.
I need to comment lines from
Code:
“/tmp/a.txt”

from the line A to line B through the command prompt only.
Please use variables not direct values like 2 or 5

It can be done with VI editor but it's not matches with my requirement
Code:
 (: 2,5 s/^/#/g)

.

Please help me with the command..

Code:
/tmp:} A=2
/tmp:} B=5
/tmp:} cat /tmp/a.txt
Line no 1
Line no 2
Line no 3
Line no 4
Line no 5
Line no 6
Line no 7
Line no 8
Line no 9
Line no 10

Output should be

Code:
/tmp:} cat /tmp/a.txt
Line no 1
#Line no 2
#Line no 3
#Line no 4
#Line no 5
Line no 6
Line no 7
Line no 8
Line no 9
Line no 10

# 2  
Old 04-12-2013
vi and sed are closely related:
Code:
$ sed "2,5 s/^/#/" a.txt
Line no 1
#Line no 2
#Line no 3
#Line no 4
#Line no 5
Line no 6
Line no 7
Line no 8
Line no 9
Line no 10

This User Gave Thanks to hanson44 For This Post:
sdosanjh
 
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