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GuruMeditation
Docs » Autodocs » dos.library » SystemTagList

NAME

	SystemTagList -- Have a shell execute a command line (V36)

SYNOPSIS

	error = SystemTagList(command, tags)
D0 D1 D2
LONG SystemTagList(STRPTR, struct TagItem *)
error = System(command, tags)
D0 D1 D2
LONG System(STRPTR, struct TagItem *)
error = SystemTags(command, Tag1, ...)
LONG SystemTags(STRPTR, ULONG, ...)

FUNCTION

	Similar to Execute(), but does not read commands from the input
filehandle. Spawns a Shell process to execute the command, and
returns the returncode the command produced, or -1 if the command
could not be run for any reason. The input and output filehandles
will not be closed by System, you must close them (if needed) after
System returns, if you specified them via SYS_Input or SYS_Output.
By default the new process will use your current Input() and Output()
filehandles. Normal Shell command-line parsing will be done
including redirection on 'command'. The current directory and path
will be inherited from your process. Your path will be used to find
the command (if no path is specified).
Note that you may NOT pass the same filehandle for both SYS_Input
and SYS_Output. If you want input and output to both be to the same
CON: window, pass a SYS_Input of a filehandle on the CON: window,
and pass a SYS_Output of NULL. The shell will automatically set
the default Output() stream to the window you passed via SYS_Input,
by opening "*" on that handler.
If used with the SYS_Asynch flag, it WILL close both it's input and
output filehandles after running the command (even if these were
your Input() and Output()!)
Normally uses the boot (ROM) shell, but other shells can be specified
via SYS_UserShell and SYS_CustomShell. Normally, you should send
things written by the user to the UserShell. The UserShell defaults
to the same shell as the boot shell.
The tags are passed through to CreateNewProc() (tags that conflict
with SystemTagList() will be filtered out). This allows setting
things like priority, etc for the new process. The tags that are
currently filtered out are:
NP_Seglist
NP_FreeSeglist
NP_Entry
NP_Input
NP_Output
NP_CloseInput
NP_CloseOutput
NP_HomeDir
NP_Cli

INPUTS

	command - Program and arguments
tags - see <dos/dostags.h>. Note that both SystemTagList()-
specific tags and tags from CreateNewProc() may be passed.

RESULT

	error	- 0 for success, result from command, or -1.  Note that on
error, the caller is responsible for any filehandles or other
things passed in via tags. -1 will only be returned if
dos could not create the new shell. If the command is not
found the shell will return an error value, normally
RETURN_ERROR.

SEE ALSO

Execute(), CreateNewProc(), <dos/dostags.h>, Input(), Output()

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