   Parameters: 
   [COLUMNS [#columns {72} [pos [beg-col]]] | FILES [beg#[end#]]]
   [DIRECTORY [file-spec][#cols]]
  
 shows line columns, files used, or directory listings. 
  
 The  "COLUMNS"  (or "C") option shows a column-indicator line of
 length "#columns" (default of 72).  The  column  indicator  will
 align  with  printed  lines  unless  the  "pos" line position is
 specified  ("pos"  may  be  signed  +  or  -  relative  to   the
 printed-line position).  Columns will be numbered from "beg-col"
 (default is 1). 
  
 The  "FILES"  (or  "F") option shows a list of files used during
 the current edit session.  Each  file  specification  is  listed
 with  the  number  of lines read from or written to the file and
 the number of the last input or output reference that  was  made
 to the  file.    The  usage column indicates the remembered Edit
 file with "Edit->", the remembered Merge file with "Merge>", and
 the remembered Command file with "Cmds->".  For Example: 
  
             # INP  OUT  Lines  Usage  File Name
             1   1   10    87   Edit-> MYPROG.FOR
             2   2    0    19   Merge> XXX.FOR
  
 A portion of the file list may be specified by giving the  range
 of files  "beg#" to "end#".  If "end#" is omitted, only one file
 is selected. 
  
 The "beg#" may be signed + or -, relative to the position of the
 current  edit  file  specification  in  the  list,  and  "end#",
 relative to "beg#". 
  
 The  "DIRECTORY" (or "D") option allows directory listings to be
 displayed.  Only entire directories can be  diplayed,  and  only
 highest-version files  are  listed.   However, logical names are
 allowed:  SHOW DIR SYS$LOGIN:  Also, a  directory  name  may  be
 given relative  to  a logical name:  SHOW DIR SYS$LOGIN:[.TEST].
 Unless otherwise specified, "#col" will default so  as  to  pack
 the requested file names within the current line length. 
