Operating System Functions
Statements and procedures for working with files, directories and the system.
Description
The statements and procedures listed here provide access to the operating system environment. They transfer execution to external programs, get information about files and directories, manipulate the file system and send commands to the command shell.
Working with Files
Procedures that deal with files.
Working with Directories
Various directory management procedures.
File Properties
Get information about files.
System Procedures
Procedures for working with the environment.

Working with Files Exec and Chain Temporarily transfers control to another program. Run Transfers control to another program.
Kill
Deletes an existing file.
Name
Renames an existing file.
Working with Directories
CurDir
Gets the current working directory.
ChDir
Sets the current working directory.
Dir
Gets the names of files or directories matching certain attributes.
ExePath
Gets the directory of the current running program.
MkDir
Creates a new directory.
RmDir
Deletes an existing directory.
File Properties
FileAttr
Gets information about a file bound to a file number.
FileCopy
Copies a file.
FileDateTime
Gets the last modified date and time of a file.
FileExists
Tests for the existence of a file.
FileLen
Gets the length (in bytes) of a file.
System Procedures
Fre
Gets the amount of free memory (in bytes) available.
Command
Gets the command-line parameters passed to the program.
Environ
Gets the value of an environment variable.
SetEnviron
Sets the value of an environment variable.
Shell
Sends a command to the system command interpreter.
System
Closes all open files and exits the program.