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exec
<string>
exec is undoable, queryable, and editable.
The string argument is a command which gets executed as a background process from the shell. Note that the exec command is system dependent, and will give different results on Windows than on a UNIX system. On UNIX systems (eg Linux and Mac OS X) the process id of the background process is returned as an int. On Windows, 0 is returned if the command is successful. On Windows we use spawnvp and on UNIX systems we use execv.int
In query mode, return type is based on queried flag.
exec ("render");
// Result: 913 //