How To Use Quotes In Variable In Bash

I need to assign a command to a variable and execute it with variable in linux bash. The command executes fine from command line but not from the variable because of multiple quotes. I hope backslash should be used for multiple quotes to avoid the error. Please help with the correct format. **Code:** parm="cat file|awk '$1>0 && $1="abc" {print f $0} {f=$0 ORS}'" eval "$parm" **Contents:** abc 123 efg 456 **Error:** awk: cmd. line:1: >0 && =abc {print f bash} {f=bash ORS} awk: cmd. line:1: ^ syntax error Thanks in advance!