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Adding a backslash in front of square brackets with sed

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Top Forums Shell Programming and Scripting Adding a backslash in front of square brackets with sed
# 8  
Old 03-04-2013
A ] character within a [character_set] must be first, to not become the closing ]
This User Gave Thanks to MadeInGermany For This Post:
lehaste
# 9  
Old 03-04-2013
Thanks mirni!
# 10  
Old 03-04-2013
And everyone else! It wasn't just me who provided relevant info Smilie
You're welcome!
# 11  
Old 03-14-2013
I tried
Code:
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.
# 12  
Old 03-14-2013
Perl and sed are not the same thing. Although I am quite rusty in Perl, this should do the trick:
Code:
 perl -pe s'/([][])/\\$1/g'

# 13  
Old 03-14-2013
What is your OS and version? How do you write this sed command to a file using perl? Did you use single quotes or double quotes?
# 14  
Old 03-14-2013
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:
Code:
print {$sh} "set expr=`echo $temp | sed 's/[][]/\\&\g'`\n";
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