what-extracts SCCS version information from a file by printing information found after the () pattern

what ” extracts SCCS version information from a file by printing information found after the @(#) pattern

 what [ s] filename 

what searches each filename for the occurrence of the pattern @(#) , which the SCCS get command substitutes for the %Z% keyword, and prints what follows up to a " > , newline, \ , or null character.