       1mfor_file 4m22mvar24m 4mfilename24m 4mcode0m
              This  procedure  implements  a loop over the contents of a file.
              For each line in 4mfilename24m, it sets 4mvar24m to the line and  executes
              4mcode24m.

              The 1mbreak 22mand 1mcontinue 22mcommands work as with foreach.

              For example, the command

                   for_file line /etc/passwd {echo $line}

              would echo all the lines in the password file.
