The easiest way to quote for the shell: * Add ' at the beginning and end * Replace internal ' with '\'' This is because inside '-quoted string only ' itself

The easiest way to quote for the shell: * Add ' at the beginning and end * Replace internal ' with '\'' This is because inside '-quoted string only ' itself has special semantics. > wrap each argument in 's if it contains anything suspicious. Such vague advice is wrong in all contexts.