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Shell Programming and Scripting

Search & Replace

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# 1  
Old 06-14-2012
Search & Replace
Hi all

Please can you help me with a script to check several files for the following string:
Code:
encoding=""

and replace it with:
Code:
encoding="UTF-8"

I did the following, :
Code:
#!/bin/sh
string1="encoding="""
string2="encoding="UTF-8"
sed 's/'"$string1"'/'"$string2"'/g'

but does not work.

Please can you help

FR
# 2  
Old 06-14-2012
Having $string2 defined as the complete output makes no sense (to me) as you could simply print it without any substitution. I guess this is more appropriate:
Code:
$> string1='encoding=""'; string2=UTF-8; echo $string1| sed 's/""/'$string2'/g'
encoding=UTF-8

sed is a StreamEditor and so needs a stream as input to work on. Having no file or redirected input won't make it work.
Last edited by zaxxon; 06-14-2012 at 10:40 AM..
# 3  
Old 06-14-2012
Quote:
Originally Posted by fretagi
Code:
#!/bin/sh
string1="encoding="""
string2="encoding="UTF-8"
sed 's/'"$string1"'/'"$string2"'/g'


Original:
Code:
#!/bin/sh
string1="encoding="""
string2="encoding="UTF-8"
sed 's/'"$string1"'/'"$string2"'/g'

Needs to be:

Code:
#!/bin/sh
string1="encoding=\"\""
string2="encoding=\"UTF-8\""
sed 's/$string1/$string2/g'

Another thing I don't see here is what stream are you passing to sed?
You have no file name at the end of the sed command and you are not piping anything into the front of it, so sed has no stream to work on.
# 4  
Old 06-14-2012
One way using perl. It modifies your files in-place, use -i.bak to create a backup of each file with 'bak' suffix.
Code:
$ perl -i -pe 's/\A(encoding=")(")/$1UTF-8$2/' files

# 5  
Old 06-14-2012
Sorry

I did not get it working!

Do I have to run like:

Code:
./mach.ksh <filename.txt

where filename.txt is where the

Code:
encoding="UTF-8"

exist?
# 6  
Old 06-14-2012
@birei
sed can modify file in place as well with the "-i" (or --in-place) flag.

sed man page clip:
Quote:
-i[SUFFIX], --in-place[=SUFFIX]

edit files in place (makes backup if extension supplied). The default operation mode is to break symbolic and
hard links. This can be changed with --follow-symlinks and --copy.
# 7  
Old 06-14-2012
I changed my post, best try out the actual content of it, thanks.
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