#printSo far all the special characters in the substitutecommand are used to select the string to be replaced.There is one character used in the new string to be inserted.It is '&' which when used on the right hand side of a substitution,refers to the expression given on the left hand side.For example, the commands/the/&m/changes "the" into "them".  Try that on file "text";then rewrite the file and type "ready".#create Refwe went to see them yesterday.#create textwe went to see the yesterday.#user#cmp text Ref#log#next36.2b 5