The Natural user exit SHCMD
can be used to issue an
operating system command, call a shell
script or execute an
executable program on UNIX from within a Natural program.
This document covers the following topics:
CALL 'SHCMD'
'command'
['option']
|
command
|
Command to be executed under control of the operating system command shell. Natural waits until the command is completed and then Natural returns control back to the Natural program. For more information, see Examples below. |
option
|
See Parameter Options below. |
The following parameter options are available:
Note:
The options SCREENIO
and
NOSCREENIO
may be not set at the same time.
The following return code values are available:
Return Code | Description |
---|---|
0 |
Command successfully executed. |
4 |
Illegal SHCMD parameter specified. |
All other codes | Command shell return code. |
Execute a command shell from within Natural:
CALL 'SHCMD' 'myshell.sh'
Execute an executable program from within Natural:
CALL 'SHCMD' 'myprogram'
Execute the operating system command ls
on
UNIX to list the contents of a directory:
CALL 'SHCMD' 'ls'
After executing the ls
command, you will
recognize that the output generated by this command has changed the last
Natural screen output. You have to press the refresh-screen key to clear the
screen. To do this automatically, you can specify the SCREENIO
option:
CALL 'SHCMD' 'ls' 'SCREENIO'
Retrieve the return code by using the RET
function:
DEFINE DATA LOCAL 1 rc (I4) END-DEFINE CALL 'SHCMD' 'lsDIRECTORY' 'SCREENIO' ASSIGN rc = RET( 'SHCMD' ) /* retrieve return code IF rc <> 0 THEN IF rc = 4 THEN WRITE NOTITLE 'Illegal option specified' ELSE WRITE NOTITLE 'Command not executed successfully (rc=' rc ')' END-IF ELSE WRITE NOTITLE 'Command executed successfully' END-IF END