• To open a file into the editor: 

> JOB
> OPSED filename 
• LIS            display all lines in file (cursor goes to last line displayed) (hit the pause key at any time to stop scrolling)

LIS #         display a certain number of lines (cursor goes to last line displayed)
• G #           go to particular line
• DEL          delete the line you are on

DEL #       delete a particular line
• ADD         adds a line where you are
• REP          replace what is in the line you are on

REP #       replace line number 
• LIN            will show what line you are on
• LDIR          lists all files in directory
• FOR          can use relative or absolute numbers
• BACK        can use relative or absolute numbers 
• SCA          scale function (shows column numbers)
• PC            will show any control characters in the file (if you have odd errors, try this)
• P #           shows number of lines (cursor remains at line 1) 
• CHA "string" "string" 1 999        Change one string to another from line # to line #
• MOD          modify the line you are currently on
• MOD #       modify a particular line

modify commands:  _ (underscore) deletes what is in that position
                              &   deletes what is in that position but leaves a space
                              hitting space key will also leave a space
• REC filename      Save current file as filename "______"
• REC *           Save current file as current filename
• RENAME filename(old)  filename(new)     rename file
• REMOVE filename      delete the file 
• EXIT or E       Exit the editor program

If you edit an observe file using opsed (or emacs), it is a good idea to check the file with the following command:

> JOB
> FILECHK filename
 

For more complete information, refer to the "Modcomp Programmer's Reference Manual". Commands are found on pages 1-2.