In this section, we will explore the essential file management commands in Control Language (CL). These commands are fundamental for managing files on your system, including creating, deleting, copying, and moving files. Understanding these commands will help you efficiently handle file operations in your CL programs.

1. File Creation and Deletion: Learn how to create and delete files using CL commands.
2. File Copying and Moving: Understand how to copy and move files within the system.
3. File Attributes: Get familiar with commands to view and modify file attributes.
4. File Access and Permissions: Learn how to manage file access and permissions.

Here is a list of some common file management commands in CL:

The CRTPF command is used to create a physical file. Here is an example:

Explanation:

• FILE(MYLIB/MYFILE): Specifies the library (MYLIB) and the file name (MYFILE).
• RCDLEN(100): Specifies the record length of the file.

The DLTF command deletes a file. Here is an example:

Explanation:

• FILE(MYLIB/MYFILE): Specifies the library and the file name to be deleted.

The CPYF command copies a file. Here is an example:

Explanation:

• FROMFILE(MYLIB/SRCFILE): Specifies the source file.
• TOFILE(MYLIB/DESTFILE): Specifies the destination file.
• MBROPT(*REPLACE): Specifies that the destination file should be replaced if it already exists.

The MOVOBJ command moves an object, including files. Here is an example:

Explanation:

• OBJ(MYLIB/MYFILE): Specifies the object to be moved.
• OBJTYPE(*FILE): Specifies the type of object (file).
• TOLIB(NEWLIB): Specifies the target library.

The CHGPF command changes the attributes of a physical file. Here is an example:

Explanation:

• FILE(MYLIB/MYFILE): Specifies the file whose attributes are to be changed.
• SIZE(*NOMAX): Specifies that the file size should be set to no maximum.

The DSPFD command displays the description of a file. Here is an example:

Explanation:

• FILE(MYLIB/MYFILE): Specifies the file whose description is to be displayed.

The GRTOBJAUT command grants authority to an object. Here is an example:

Explanation:

• OBJ(MYLIB/MYFILE): Specifies the object to which authority is being granted.
• OBJTYPE(*FILE): Specifies the type of object (file).
• USER(USER1): Specifies the user to whom authority is being granted.
• AUT(*ALL): Specifies the type of authority being granted (all permissions).

1. Create a physical file named TESTFILE in the library TESTLIB with a record length of 80.
2. Delete the file TESTFILE from the library TESTLIB.

Solution:

1. Copy a file named SOURCEFILE from the library SRCLIB to a file named TARGETFILE in the library TARGLIB.
2. Move the file TARGETFILE from the library TARGLIB to the library FINALIB.

Solution:

1. Change the size of the file MYFILE in the library MYLIB to no maximum.
2. Display the description of the file MYFILE in the library MYLIB.

Solution:

• Incorrect Library/File Names: Ensure that the library and file names are correctly specified in the commands.
• Permissions: Make sure you have the necessary permissions to perform file operations.
• File Existence: Verify that the file exists before attempting to delete or move it.

In this section, we covered the essential file management commands in CL, including creating, deleting, copying, and moving files. We also explored how to change file attributes and manage file permissions. These commands are fundamental for efficient file management in your CL programs. In the next section, we will delve into job management commands, which are crucial for managing jobs and processes on your system.