home *** CD-ROM | disk | FTP | other *** search
- _____________________________
- / \
- | Inside Vax/Vms |
- | Using Command Procedures |
- | |
- | By |
- | Master Blaster |
- \_____________________________/
- Advanced Telecommunications Inc.
-
- Note: The following is geared for the more advanvced hacker.
-
- Part 1: Using Command Procedures.
- ----- ------- ----------
- You can use command procedures to automate sequences of
- commands that you use quite often. For example, if you always
- use the DIRECTORY command after you move to a Sub-Directory
- where work files are kept, you can write a simple command
- procedure to issue the SET DEFAULT and DIRECTORY commands for you.
- the following example, GO_DIR.COM, contains two commands:
- $ Set Default [perry.accounts]
- $ directory
- Instead of using each command alone, you can execute GO_DIR.COM
- with the @ command:
- $ @Go_Dir
-
- this command tells the DCL command interpreter to read the file
- GO_DIR.COM and executes the commands in the file. So the command
- interpreter sets your default directory to[PERRY.ACCOUNTS] and
- issues the DIRECTORY command.
-
- note: DCL means Digital Command Language. (sorry)
-
- Formatting Command Procedures
- ---------- ------- ----------
- Use the DCL command CREATE to create and format a command
- procedure. When you name the command procedure, use the default
- file type COM. If you use this default, you don't have to use the
- file type when you execute the procedure with the @ command.
- Command procedures contain DCL commands that you want the DCL
- command intepreter to execute and data lines that are used by
- these commands. Commands must begin with a dollar sign. You can
- start the command string just after the dollar sign.
- Data lines do not start with a dollar sign. Data lines are used
- as input data for commands. Data lines are used by the most
- recently issued command.
-
- the following example shows command and data lines in a command
- rocedure.
- $ mail
- SEND
- THOMAS
- MY MEMO
- did you get my memo?
-
- Show users thomas
- The first line is a command and must start with a "$". The next
- lines are data lines that are used by the mail function; these
- lines must not start with "$".
-
- Using Multiple Lines for One Command
- ----- -------- ----- --- --- -------
-
- If you are writing a command that includes many qua|ifers,
- ou can make the command procedure more readable by |isting the
- qualifers on seperate lines rather than running them together. To
- do this, use the hyphen as a continuation character. Don't start
- the continued line with "$". For example:
- $ print test.out -
- /after=18:00 -
- /copies=10 -
- /queue=lpb0:
-
- Executing Command Procedures
- -------- ------- ----------
- You can execute command procedures in two modes: interactive
- and batch. In interactive mode, the commands in the command
- procedure are executing as if you were typing them. You cannot
- execute any other commands from your computer. In batch mode,
- the system creates a seprate process to run the command
- procedure. After you use a batch job you can continue to use
- the system while it executes.
-
- Executing Command Procedures Interactively
- -------- -------- ---------- -------------
- To execute a command procedure interactively, type the "@"
- command followed by the file specifications. If you don't enter
- the entire command specification, the system will use the current
- disk, directory, and file default.
-
- Changing Command Levels
- -------- ------- ------
- A command level is the DCL level from which you issue
- commands. When you log in and type commands at your Computer,
- you are issuing commands at your level zero. If you execute a
- procedure, the commands in the procedure are executed at command
- level 1. When the procedure ends and the DCL prompt is on your
- screen, you are back at levil zero.
-
- A System Login File
- - ------ ----- ----
- If a system login fi|e exists, it is executed before the
- personal file. When the system login file ends, control is
- passed to the personal login file. System and group login files
- allow a system manager to make sure certian files are executed
- when a person logs in.
- To make a system login file, you have to have a managers account,
- you use the name SYS$SYLOGIN to make the login file.
-
- Personal Login Files
- ------- ----- -----
- After executing a system or group login file, the system
- executes a personal login file. Use a personal login file to
- execute gommands that you want to that you want to issue
- everytime you login. Name the login command procedure LOGIN.COM
- and put it in the default login directory.
-
- Defining Parameters or Qualifers
- --------- ---------- -- ---------
- You can create a command procedure that specifies only
- parameters and(or) qualifers and then use the command procedure
- then a DCL command string. This type of command procedure is
- useful when there is a set of parameters or qualifiers that you
- requently use with one or more particular commands. To execute
- the command string where you would normally use the qualifiers or
- parameters.
- For example: You could greate a command procedure that contains
- these qualifiers.
- /DEBUG/SYMBOL_TABLE/MAP/FULL/CROSS_REFERENCE
-
- To use this command procedure, execute it on the command line
- where you would otherwise place qualifiers. For example, if you
- name the command procedure DEFLINK.COM, you would use the
- following command line to link to an object module name
- SYNAPSE.OBJ with the qualifiers that you specified in the command
- procedure:
- $ LINK SYNAPSE@DEFLINK
-
- The next example shows a command procedure named PARM.COM that
- contains parameters:
- CHAP1, CHAP2
- To execute the procedure, use it in a command string in place of a
- parameter name:
- $ DIRECTORY @PARAM
-
- As the others in this set are completed, they should stay in a
- group.
- ________________________________________________
- \
- H)ackRite 1986 - Advanced Telecommunications Inc.
- ________________________________________________/
-