Shell Programming and Scripting

Hi guys,

I'm trying to figure out how to use a shell variable inside my sed command.
I just want to remove a certain part of a path. I've tried three different combinations and none of them work. Here are the three combinations:

Code:

echo $file | sed 's/'$test'//'
echo $file | sed "s/$test//"
echo $file | sed 's/'"$test"'//'

and all three of these generate the same error:

sed: -e expression #1, char 8: unknown option to `s'

I just want to remove $test from $file. I'm using tcsh. Does anyone have any ideas on what I can do? Appreciate all the help!

Code:

 
$ test=a
$ echo "abac" | sed "s/$test/A/g"
AbAc

what does the variable $test contains?
If there are "/" in variable, you should escape it or use another terminator.

Code:

sed "s|$test||g"

is that working fine in bash?

It will work in bash, but in that shell there is no need for sed since you can just do this:

Code:

echo "${file//$test}"

Hi, i am not aware of this bash feature. Whats this feature? so, can we pass filename to echo command? Where can i learn about this more? Thanks

@Pandeesh,

Bash support many string manipulation strings

Manipulating Strings