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Use variables with double quotes sed -i

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# 1  
Old 02-05-2010
Use variables with double quotes sed -i
I have the following line of code:

Code:
sed -i "/MatchText/ s/${tgrepLine}/${tNewLine}/" filename.output

filename.output contains this:

Code:
blablabla
PATH=".:/home/root/bin/:/usr/local/bin/"
blablabla

Variable ${tgrepLine} contains:
PATH=".:/home/root/bin/:/usr/local/bin/"
Variable ${tNewLine} contains:
PATH="/home/user/bin/:.:/home/root/bin/:/usr/local/bin/"

As you can see, both variables contains " (double quotes)
If I run the 'sed -i' command, I get an error.
I cant use double quotes within the double quotes of the 'sed' command...

The sed command would look like this:

Code:
sed -i "/MatchText/ s/PATH=".:/home/root/bin/:/usr/local/bin/"/PATH="/home/user/bin/:.:/home/root/bin/:/usr/local/bin/"/" filename.output

I must find a solution to this problem. Do I need to use the double quotes in both commands??

Thanks in advance!
# 2  
Old 02-05-2010
Hi.

The quotes aren't really a problem, if you escape them. In this case you can use single outer quotes. Also, your path contains /, which is "confusing" sed.

Change the separator to something else:

Code:

sed -i '/MatchText/ s@PATH=".:/home/root/bin/:/usr/local/bin/"@PATH="/home/user/bin/:.:/home/root/bin/:/usr/local/bin/"@' filename.output

# 3  
Old 02-05-2010
Tried it, but still nothing.
Tried this one:
sed -i s_${tgrepLine}_${tNewLine}_ filename.output

But than i got the following error:
sed: -e expression #1, char 38: unknown option to `s'

---------- Post updated at 11:54 AM ---------- Previous update was at 11:51 AM ----------
Quote:
Originally Posted by scottn
Hi.

The quotes aren't really a problem, if you escape them. In this case you can use single outer quotes. Also, your path contains /, which is "confusing" sed.

Change the separator to something else:

Code:

sed -i '/MatchText/ s@PATH=".:/home/root/bin/:/usr/local/bin/"@PATH="/home/user/bin/:.:/home/root/bin/:/usr/local/bin/"@' filename.output


Can I use single quotes?
If I use single quotes, the variable names are just displayed as 'variable names' and not with their content.
# 4  
Old 02-05-2010
I don't think using _ is a good candidate for a separator.

Code:
$ cat file1
PATH=".:/home/root/bin/:/usr/local/bin/"

$ echo $X
PATH=".:/home/root/bin/:/usr/local/bin/"

$ echo $Y
PATH="/home/user/bin/:.:/home/root/bin/:/usr/local/bin/"

$ sed "s@$X@$Y@" file1
PATH="/home/user/bin/:.:/home/root/bin/:/usr/local/bin/"

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