[SOLVED] Put .(dot) infront of thousands of entries in a file.

Satyaveer Arya · 02-28-2012, 04:05 AM

Hi,

I have to put dot(.) infront of thousands of entries in a file. Can anyone please tell me how to do that through shell scripting? I have a file named 'restricted', there are more than 70,000 lines or entries in this file and infront of each lines or entries I have to put dot(.). How can I do that? I'm not good in shell scripting, please help me.

firstfire · 02-28-2012, 04:21 AM

Hi.

Using sed:

Code:

$ sed 's/^/./' infile

(use -i flag to actually change infile or redirect to another file)
or in bash

Code:

while read line; do echo ".$line" ; done <  infile

or using awk (mawk is faster)

Code:

mawk '{print "."$0}' infile

or perl

Code:

perl -ne 'print ".$_"' infile

(again, add -i to edit infile in place)

If you already have each line of a file in a variable, you can use something like this

Code:

$ x=123; echo ${x/#/.}
.123

Satyaveer Arya · 02-28-2012, 05:29 AM

Hi,

I used this:

Quote:

while read line; do echo ".$line" ; done < infile > a.txt

and it worked for me.

Thanks for your help.