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sed variable issue

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# 1  
Old 11-27-2006
sed variable issue
I'm writting a krn shell script and i'm having an issue with a variable using sed.
If someone enters a variable with a " /" the sed command doesn't read it right.
example.
a='12000/10-DC'
b='12000/10-AC'

cat file | sed "s/$a/$b/"

How can i correct this issue? Will the fix to this problem also work if someone enters a variable without a " /" ? What is it called when a variable has a character like this? I didn't know how to search for this issue correctly.
Thanks.
Smilie
# 2  
Old 11-27-2006
Here is one workaround -- use delimiting characters that are not in the user-defined strings (assumes the # character is not in the strings):
Code:
a='12000/10-DC'
b='12000/10-AC'

cat file | sed "s#$a#$b#"

# 3  
Old 11-27-2006
Thanks it worked.
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