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Replacing Strings in a File

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# 1  
Old 03-20-2010
Replacing Strings in a File
I have a input file which looks like this:

Code:
Value1=""
Value2=""
Value3=""

ListOfValues=" $Value1 $Value2 $Value3"

I have another program which computes the values ($val1, $val2, $val3). So if $val1 is 'A', $val2 is 'B' and $val3 is 'C', I should edit the input file so it will look like:

Code:
Value1="A"
Value2="B"
Value3="C"

ListOfValues=" $Value1 $Value2 $Value3"

Note that Value1, Value2 and Value3 are fixed variable names.
# 2  
Old 03-20-2010
Maybe something like this ?

Code:
$ 
$ cat input.txt
Value1=""
Value2=""
Value3=""

ListOfValues=" $Value1 $Value2 $Value3"
$ 
$ echo $val1
A
$ echo $val2
B
$ echo $val3
C
$ 
$ # modify the file input.txt inline
$ perl -pi.bak -e "s/^Value1.*$/Value1=\"$val1\"/; s/^Value2.*$/Value2=\"$val2\"/; s/^Value3.*$/Value3=\"$val3\"/" input.txt
$ 
$ # check the contents
$ cat input.txt
Value1="A"
Value2="B"
Value3="C"

ListOfValues=" $Value1 $Value2 $Value3"
$ 
$

Quote:
Originally Posted by laiko
Note that ... are fixed variable names.
Sounds like an oxymoron. Smilie

tyler_durden
# 3  
Old 03-21-2010
Thanks Tyler, that really helped!

---------- Post updated at 12:29 PM ---------- Previous update was at 09:16 AM ----------

By the way, I noticed that it creates a BAK file. Is it possible not to? Thanks.
# 4  
Old 03-22-2010
Code:
val1=1;val2=2;val3=3
sed "s/Value1=.*/Value1=\"$val1\"/;s/Value2=.*/Value2=\"$val2\"/;s/Value3=.*/Value3=\"$val3\"/" file

# 5  
Old 03-22-2010
Thanks, Kurumi...
But I should have made my question clear.. What I meant was is it possible to avoid creation of an extra file? I just want to update the input.txt without the need to create an intermediate file..
Thanks in advance..
# 6  
Old 03-22-2010
Quote:
Originally Posted by laiko
Thanks Tyler, that really helped!
By the way, I noticed that it creates a BAK file. Is it possible not to? Thanks.
Replace:
Code:
perl -pi.bak

with:
Code:
perl -pi

Last edited by Franklin52; 03-22-2010 at 11:26 AM..
# 7  
Old 03-22-2010
Quote:
Originally Posted by laiko
Thanks, Kurumi...
But I should have made my question clear.. What I meant was is it possible to avoid creation of an extra file? I just want to update the input.txt without the need to create an intermediate file..
Thanks in advance..
use -i
Code:
 sed -i.bak [.....] file

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