From: arne@vajhoej.dk   
      
   On 2/21/2025 5:18 PM, Lawrence D'Oliveiro wrote:   
   > On Fri, 21 Feb 2025 16:42:56 -0500, Stephen Hoffman wrote:   
   >> Is it feasible for DCL?  Sure. Though it'll likely involve passing some   
   >> of the syntax to lib$table_parse or ilk for parsing, as do a few DCL   
   >> commands I've encountered (or have written) over the years.   
   >   
   > What happens when you bypass DCL? So one program directly spawns another   
   > and gives it a command to execute. Can the receiving program behave the   
   > same in that case as if it were invoked from a shell?   
      
   This is where the difference in *nix and VMS process model   
   get into the picture.   
      
   A "normal" process on VMS got the CLI (DCL) in P1 and   
   the running image in P0 and/or P2.   
      
   Most ways to activate another image (lib$spawn, C system,   
   C exec* etc.) end up creating a process with CLI mapped.   
      
   It is possible to start a process without CLI (sys$creprc   
   or run process - with an image that is not loginout.exe).   
      
   In that case I don't think there are a concept of arguments.   
   I don't see a way to pass arguments. Arguments are something   
   CLI provide to image, so no CLI means no arguments.   
      
   Such processes exist, but I would consider them relative   
   rare. There are some limitations on such processes - some   
   LIB$ functions will return LIB$_NOCLI.   
      
   Arne   
      
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