Output a variable to command

[kazza765]

Hi all. I have a fairly simple question, but I can't find the answer anywhere on the internet. All I'm trying to do is get my bash script to rename some files.

The command I want the script to run is of the form

rename 's/4s/2p/' *

but in place of 4s I want my variable. If I just try something like this

var=4s
rename 's/${var}/2p/' *

I get an error "Global symbol "$var" requires explicit package name at (eval 1) line 1."

I've tried about a dozen different things now. Obviously the problem is the use of the quotation marks but I just can't work it out. I would be very grateful if someone can show me the correct syntax.

Thankyou

[GNU-Fan]

First, try double quotation marks. (")

If this doesn't work, use xargs.

[kazza765]

Fantastic, works perfectly, thankyou.

Now I feel incredibly silly for not doing that initially, instead of the incredibly long and convoluted expressions I've been trying for the last half hour.