Error executing Linux command using tcl

I have the following TCL script which executes a Linux command to format a file.

exec sed -r '2,$s/(.{55} )/\1\n\t/g' $formatfileName | sed 's/ $//' > $formatfileName

I get an error saying can't read "s": no such variable while executing the above line - It is considering $ sign in Linux command as a variable. I tried to put curly braces {} but that did not work.

Can you please advise how to use the above command without errors? Thanks for your help.

Copyright Notice：Content Author:「NewCoder」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/46085397/error-executing-linux-command-using-tcl

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