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NAME

       med - NCAR CGM metafile frame editor

SYNOPSIS

       med [ -e command ]* [ -f sfilename ] [ -l local_dir ] [ -V ] [ filename]

DESCRIPTION

       med is a frame-level, metafile editor designed to resemble syntactically UNIX's sed(1) and
       ed(1).  med operates on a copy of filename, called  a  buffer,  and overwrites a file only
       when  you  issue  the  w  (write) command.  med provides line oriented editing commands to
       display or delete frames from the buffer, to move, copy or merge frames within the buffer,
       or  to write frames from and read frames into the buffer. By default med reads in commands
       from standard input.

OPTIONS

       -e command
              command is a single med command. The  valid  med  commands  are  discussed  in  the
              Commands  section  below.  Multiple -e options may appear on a single command line.
              Be careful to use quotes if your command contains  spaces  or  metacharacters  that
              might  be  interpreted  by  the  shell. When this option is used med does not enter
              interactive mode. It simply performs the given commands and then exits.

       -f sfilename
              Execute the med line-separated list of commands in the file sfilename.   After  the
              commands are exhausted med will exit.

       -l local_dir
              Use  local_dir  as  the tmp directory for scratch disk space. If this option is not
              specified med will use the value of  the  $NCARG_TMP  or  the  $TMPDIR  environment
              variable.  See  ncargintro(1ncarg)  for  a  discussion on NCAR Graphics environment
              variables.

       -V     Print the version number and then exit.

USAGE

   Command Structure
       med commands attempt to have a syntactically identical form to those of ed(1)  or  sed(1).
       Commands  consist  of  an  optional  address  or two optional, comma separated, addresses,
       followed by a command, which may be abbreviated, possibly followed by a third address or a
       command specific argument list :

              [ address [, address ] ] command [ address | args ]

       If  only  one  address  is  specified,  operations  are  performed  on that frame.  If two
       addresses are specified, med performs the operation on the inclusive range of frames.   If
       no address is specified then the current frame is used as a default. The exception to this
       are the w (write) and the a (append) commands. The default address for  w  is  the  entire
       buffer.

       For  example,  1,10p  means  “print (display) frame 1 through 10” (two addresses), d means
       “delete the current frame” (no address implies the current frame  used  as  default),  and
       1,5c5  means  “append  a  copy  of  frames 1 through 5 at frame 5” (three addresses).  The
       meaning of argument varies for each operation. In  med's  current  state  the  only  valid
       argument  is a filename — for the write, w , command for instance, argument is the name of
       the file to write to.

       Unlike its friends ed(1) and sed(1) med attempts to be fairly user friendly. If an invalid
       or  ambiguous command is given med will tell you so. If med thinks it recognizes a command
       with invalid arguments a usage  statement  for  the  offending  command  is  given.  If  a
       particular  command fails and med is smart enough to figure out why it will tell you.  med
       will almost ALWAYS immediately terminate when an error occurs  while  processing  commands
       from  a  file  or  the  command  line.  Help  is  available  by using the h command. Usage
       statements for a particular command may be obtained with: h command name .

   Addresses
       Frames can be addressed in several ways:

       nnn    By frame number.  Frames in the buffer are numbered relative to the  start  of  the
              buffer.  The first frame is frame 1.

       $      The last frame of the buffer.

       .      The  current  frame.   med  keeps track of the frame on which you last performed an
              operation.  This frame is called the current frame.  You can address this frame  by
              typing a “dot” character.

       ±n     By  relative  frame number.  Address the frame number that is n frames higher, or n
              frames lower than the current frame.

       address±n
              An address followed by a plus sign (+) or a minus sign (-), followed by  a  decimal
              number,  specifies  that  address plus or minus the indicated number of frames.  If
              the address is omitted, the current frame is used as the base.  For example, `31-3'
              addresses frame 28 in the buffer.

       If  you  do not specify an address for a command to operate on, a command that requires an
       address supplies one by default, usually the current frame.

       A pair of addresses separated by a comma signifies an inclusive range of frames,  and  the
       current frame is not changed unless the command changes it.

   Commands
       Only  one  command  may  appear per line.  Commands may accept zero, one or two addresses,
       followed by possibly a third address or an  argument.  Commands  that  accept  up  to  two
       addresses  regard  a  third as an error. Likewise, commands that do not accept an argument
       regard one as an error. Commands may be abbreviated.

       In the absence of a second address for a two or three address  command  the  command  will
       regard  the second address as the same as the first. For example, 2d is equivalent to 2,2d
       .  The absence of a first address, where required, will result in the current frame  being
       used  as  the  default.  The  same is true in the absence of a required third address. For
       example, c is equivalent to .,.c..

       The commands q (quit) and e (edit) may be  followed  by  a  '!'  to  override  med's  user
       protection.

       In  the  following  list  of  med  commands,  the  default  addresses/arguments  appear in
       parentheses; the parenthesized addresses are not part of  the  command.  Unless  otherwise
       noted a command does not change the current frame number.

       (1,$)append metafile
              Append buffer to a file. Append the addressed frames in the buffer to metafile.  If
              no address is specified the entire buffer is written. If the file  does  not  exist
              create it.
       (.,.) copy (.)
              Copy frames. Duplicate the addressed frames in the buffer and append them after the
              third address. The current frame becomes the destination of the last frame copied.
       (.,.)delete
              Delete the addressed lines from the buffer.  delete accepts one or  two  addresses;
              the  default  is  the  current  frame.  The current frame is set to the first frame
              after the deleted frame(s).
       edit metafile
              Edit a metafile.  The current contents of the buffer, if any, are erased. The named
              metafile is read in to the buffer. The resulting current frame is the last frame in
              the buffer. If changes have been made to the buffer since the last write  med  will
              refuse  the  request  unless  the  command is appended with a '!'.  edit prints the
              number of frames in the metafile. If no metafile is given, the current metafile, if
              any is used.  The current frame becomes the last frame in the file.
       help command
              help.  Give  a  usage  message for command .  If no command is given, print list of
              command names with a short description of each.
       (.,.)label string
              Label the addressed frames with string .  The CGM Begin Picture  element  contained
              in each metafile frame allows for the encoding of character data.  label provides a
              means for accessing this data.
       (.,.)merge
              Merge the contents of the second addressed frame on  top  of  the  first  addressed
              frame.  The  first  addressed  frame  is thus changed. The second frame remains the
              same. The current frame is set to the first addressed frame.
       (.,.) move (.)
              Move the addressed frames to the first frame following the third address.
       (.,.)print
              Show the contents of the buffer at the given address. What is actually displayed is
              information  regarding  the  addressed  frames. This information includes: relative
              frame number within the buffer, the number of records contained in the  frame,  the
              starting  record  for the frame and the contents of the CGM element BEGIN PICTURE .
              If no address is specified the current frame does not change. Otherwise it  becomes
              the last frame printed.
       quit
              Quit. Terminate the editing session without saving the buffer contents. In order to
              save the buffer an explicit write must be performed. If changes to the buffer  have
              been made since the last write med will refuse to terminate unless quit is appended
              with a '!'.
       (.)read metafile
              Read in a metafile. Read the contents of metafile into the buffer and append it  at
              the  given address.  metafile must be a valid NCAR CGM. The resulting current frame
              is the last frame read in.
       (1,$)split<number> outfile
              Split the current metafile into number files. The split command attempts to  create
              number  metafiles  from  the  addressed  frames,  each containing approximately n /
              number frames where 'n' is the total number of addressed frames. The first file  is
              named  outfile001.ncgm,  the  second  file  is  named  outfile002.ncgm,  and  so on
              lexicographically. If no outfile is given, med is used as the default (output files
              will be called med001.ncgm, med002.ncgm, etc.).
       (1,$)write metafile
              Write  buffer. Write the addressed frames in the buffer to metafile.  If no address
              is specified the entire buffer is written. If the file does not exist create it. If
              no file name is specified med uses the last currently remembered file name, if any.
              The currently remembered file name is the file  name  from  the  most  recent  edit
              command,  or  the  file  name  med  was  invoked with if no edit commands have been
              issued.
       ! command
              Escape to the shell and execute command.  command is a valid UNIX command.

ENVIRONMENT

       NCARG_TMP
              If set, this environment  variable  contains  a  directory  path  to  be  used  for
              temporary files. On most systems the default is /tmp.

FILES

       /tmp/cgm_tools.#    temporary; # is the process id.

EXAMPLES

       To  concatenate the files ncgm1, ncgm2, and ncgm3 into a single file ncgm123 one might use
       the following:

              % med -e 'r ncgm1' -e 'r ncgm2' -e 'r ncgm3' -e 'w ncgm123'

       Or one could pass the following script to med  as  a  -fscriptfile  option  or  enter  the
       commands interactively.

              r ncgm1
              r ncgm2
              r ncgm3
              w ncgm123

       To Overlay the contents of frame 5 on top of frame 4 from a file ncgm1 one could execute:
              % med -e '4,5 me' -e 'w!' ncgm1

SEE ALSO

       cgm(5NCARG), ed(1), sed(1V)

       Hardcopy: NCAR Graphics Fundamentals, UNIX Version

BUGS

       med
        does not understand filenames that begin with a digit or a period.

CAVEATS

       The  append,  read  and merge commands may produce surprising results. A CGM may contain a
       set of global graphical primitive attributes that are applied to every frame  in  a  file.
       Thus  reading  frames  in  from  a  file with different global attributes than the current
       working file may not produce the desired effect. The same is true when appending frames to
       a  previously  existing  file.   Similarly,  the  CGM  standard  specifies  that graphical
       attributes specified within a metafile frame affect  all  succeeding  primitives.  Thus  a
       frame which is the product of the merge command may appear differently than expected.

COPYRIGHT

       Copyright (C) 1987-2009
       University Corporation for Atmospheric Research

       The use of this Software is governed by a License Agreement.