Executes an operating system command or program as a child process, synchronously. (Deprecated).
$ZF(-1) is a deprecated function. It is described here for compatibility with existing code only. All new code development should use $ZF(-100).
$ZF(-1) permits an InterSystems IRIS process to invoke a program or a command of the host operating system. It executes the program or command specified in program as a spawned child process from the current console. It executes synchronously; it waits for the process to return. $ZF(-1) returns the child process exit status.
$ZF(-1) returns the following status codes:
It returns 0 if the child process executed successfully.
It returns a positive integer based on the exit status error code issued by the operating system shell. This integer exit status code value is determined by the host operating system. For example, for most Windows command syntax errors, $ZF(-1) returns 1.
It returns -1 if the child process could not be forked.
Because $ZF(-1) waits for a response from the spawned child process, you cannot successfully shut down InterSystems IRIS while the child process is executing.
$ZF(-1) with no specified argument launches the default operating system shell. For further details, see “Running Programs or System Commands with $ZF(-100)” in Using the Callout SDK.
If a pathname supplied in program contains a space character, pathname handling is platform-dependent. Windows and UNIX® permit space characters in pathnames, but the entire pathname containing spaces must be enclosed in an additional set of double quote (") characters. This is in accordance with the Windows cmd /c statement. For further details, specify cmd /? at the Windows command prompt.
You can use the NormalizeFilenameWithSpaces()Opens in a new tab method of the %Library.FileOpens in a new tab class to handle spaces in pathnames as appropriate for the host platform.
$ZF(-1) requires the %System_Callout:U privilege. See “Adding the %System_Callout:USE Privilege” in Using the Callout SDK for details.
If $ZF(-1) is unable to spawn a process, it generates a <FUNCTION> error.
At the Terminal in the Terminal, you can perform operations similar to $ZF(-1) by using an exclamation point (!) or a dollar sign ($) as the first character, followed by the operating system command you wish to execute. The ! or $ command line prefix executes the operating system command, returns results from the invoked process and displays those results at the Terminal. $ZF(-1) does not return operating system command results; it executes the operating system command, then returns the exit status code for the invoked process. For further details, see “Running Programs or System Commands with $ZF(-100)” in Using the Callout SDK.
An OS command audit record is added to the audit log for each $ZF(-1) call. This record includes information such as the following:
Execute O/S command Directory: c:\182u5\mgr\
Command: ls -lt 4002
The following Windows example executes a user-written program, in this case displaying the contents of a .txt file. It uses NormalizeFilenameWithSpaces() to handle a pathname for $ZF(-1). A pathname containing spaces is handled as appropriate for the host platform. A pathname that does not contain spaces is passed through unchanged. $ZF(-1) returns the Windows shell exit status of 0 if the specified file could be accessed, or 1 if the file access failed:
SET fname="C:\My Test.txt"
The following Windows example invokes the Windows operating system SOL command. SOL opens a window that displays the Solitaire game provided with the Windows operating system. Upon closing of the Solitaire interactive window, $ZF(-1) returns the Windows shell exit status of 0, indicating success:
The following Windows example invokes a non-existent Windows operating system command. $ZF(-1) returns the Windows shell exit status of 1, indicating a syntax error:
The following Windows example invokes a Windows operating system command, specifying a non-existent network name. $ZF(-1) returns the Windows shell exit error status of 2:
WRITE $ZF(-1,"NET USE :k \\bogusname")