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help for sed

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# 1  
Old 03-12-2005
help for sed
Hi...

i want to replace oldstring to newstring recursively from the folders listed in a file called "listfolder.."

So i use the following script

Quote:
while read line
sed 's/$old/$new/g' $line > newline
done < listfolder
But this will not solve my issue...
each sed command creates a new file...
I want to replace in the same file..
Is there any swithces for sed to do it..

Thanks in advance
esham
# 2  
Old 03-13-2005
Code:
while read line
   /bin/echo "s/$old/$new/g\nwq!" | ex -s $line
done < listfolder

# 3  
Old 03-13-2005
yes,...thats great..
But can we do with sed...Is there any switches for sed...for this task..

also it will be great if you can explain the usage "s/$old/$new/g\nwq!""

particularly.." g\nwq!"

thanks in advance
# 4  
Old 03-13-2005
Quote:
Originally Posted by esham
yes,...thats great..
But can we do with sed...Is there any switches for sed...for this task..
no, not with the 'stock' sed.

Quote:
Originally Posted by esham
also it will be great if you can explain the usage "s/$old/$new/g\nwq!""

particularly.." g\nwq!"

thanks in advance
the syntax of sed and ex is virtually the same.
'g' - global replace on the same line
'\n' - argument of '/bin/echo' to output 'newLine'
'wq!' - argument of 'ex' to 'Write' the file out and 'Quit' the 'ex' session.
# 5  
Old 03-14-2005
Hello vgersh99

that was a good explanation..
Thanks a lot

Regards
Esham
# 6  
Old 03-14-2005
Quote:
Originally Posted by esham
Hi...

i want to replace oldstring to newstring recursively from the folders listed in a file called "listfolder.."

So i use the following script



But this will not solve my issue...
each sed command creates a new file...
I want to replace in the same file..
Is there any swithces for sed to do it..

Thanks in advance
esham

You can simply do with sed as,

sed -i 's/$old/$new/g' <filename>

It will do changes on the filename with out in-need of new temporary file.

HTH.
# 7  
Old 03-14-2005
Quote:
Originally Posted by muthukumar
You can simply do with sed as,

sed -i 's/$old/$new/g' <filename>

It will do changes on the filename with out in-need of new temporary file.

HTH.
not with the stock sed - at least not on Solaris.
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