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CREATE
to make new files.
COPY
to make a copy of an existing file.
RENAME
to change the name of a file.
DELETE
to remove a file from the system.
CREATE
command, an editor can create a file, as can a running program, and files can be copied from other directories. This section explains use of the CREATE
command. Editors are described in Chapter 4.Before creating too many files, keep in mind that disk quotas are imposed on Science Cluster users. If you exceed your disk quota, you will be able to finish your current session using an overdraft allocation, but will be unable to create any new files until you delete enough files to bring you back within your quota. See "Managing Your Disk Space" on page 51 for more information about disk quotas.
The VMS CREATE
command is used to take keyboard input and store it directly to a file. The command requires a file name as a parameter, but will prompt you if you don't enter it on the command line. Once the command is entered, everything you type goes in the file until you press
-
to close the file (or
-
or
-
to abort). Figure 3.2 shows how to create a file called
MYPAPER.TXT
; notice that the file is immediately opened and input goes in the file.
To simply make a copy of an existing file in the current directory, for example, to make a working copy of some source code while preserving the original copy, you could use the following command:
Many VMS commands create temporary files. These files usually carry the file type .
When you are cleaning your directories, keep in mind that the
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Figure 3.2: Creating a File
If you notice a mistake before pressing
, then you can correct it with the
key, otherwise you will have to wait until the file is closed and then re-open it with a text editor (such as DECTPU or Emacs) and correct the mistake. If you press
-
while entering a line, the entire line is deleted.
Duplicating a File: The COPY Command
The COPY
command duplicates a file; it is usually used to either make a copy of a file giving it another filename, or to copy a file from one directory to another. COPY
takes two parameters: the name of the original file (including directory name), and the name of the new file.
$ COPY ANN_REP.TEX WRKNG_ANN_REP.TEX
The following command shows how to copy a file from another directory to the current directory.
$ COPY DISK$STSDAS:[JENSEN]ANN_REP.TEX *.*
The highest version number will be used if none is specified. Copying files between nodes on a network is discussed on page 152. Additional information about the COPY
command is available in the online help. Changing File Names: The RENAME Command
File names can be changed with the RENAME
command. This command takes two arguments: the old file name, and the new file name. For example:
$ RENAME OLDFILE.TXT NEWFILE.TXT
If you type RENAME
without any arguments, the system will prompt you for the old and new file names. You must have delete privileges for the file you want to rename. (File protections are described on page 54.) In the example above, no version number was specified. In this case, the highest version number is used.
The
RENAME
command does not work across disks. Use the COPY
command for this. For example, the following command will not work:
$ RENAME DISK$USER1:[JONES]A.TXT DISK$SCRATCH:[JONES]
Removing a File: The DELETE Command
This section explains how to eliminate unwanted files that can quickly clutter your account. When you type a DIRECTORY
command, you may see several files that you no longer need. To delete obsolete files, use the DELETE
command followed by a file name or file name template (wildcards). For example:
$ DELETE FILENAME.EXT;1
Notice that a version number is included. You must specify which version of a file is to be deleted. If you want to delete every version of a file, then use the wildcard character, for example:
$ DEL STAR_CHART.PLT;*
As with other commands, the DELETE
command has many options. A full description of these options can be obtained through the online help facility by typing:
$ HELP DELETE
One of the most useful options is the /CONFIRM
qualifier. This gives you a chance to change your mind. The following command shows how the CONFIRM
option is specified:
$ DELETE/CONFIRM *.C;*
The system will respond with a message listing the directory, file name, date created, and other information about each the file it is ready to delete. You then type either YES
or NO
(abbreviated to y
or n
) in response to the message. YES
will delete the file, NO
will retain the file. This command is exceptionally useful when deleting a large number of files at once. The DELETE/CONFIRM
sequence may be safely aborted at any time by pressing
-
.
TMP
. These files can be safely deleted at the end of a terminal session.PURGE
command can be used to delete all old versions of files (see "Removing Multiple Versions of Files: PURGE" on page 53).