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I'm using Red Hat, 2.16.0. Here is the line of perl code I'm using to write the sed command to the shell script:
print {$sh} "set expr=`echo $temp | sed 's/[][]/\\&\g'`\n";

I tried sed s'/[][]/\\&/g' but it replaced the square brackets with &. Any suggestions?

Note: I'm writing this sed command to a file using perl - maybe I need to add more backslashes. Will try now.

Thanks mirni!

Works great! Can one of you explain what is happening with the regular expression?

I'm trying to convert this line:
[some text]

to

\[some text\] with sed.

This is what I have so far:
sed -e 's/\[\([^]]*\)\]/\\\\\[\1\\\\\]/'

but this still gives me [some text].
...