Linked by Eugenia Loli on Mon 12th Jan 2004 05:21 UTC, submitted by Simon Strandgaard
Permalink for comment
To read all comments associated with this story, please click here.
To read all comments associated with this story, please click here.
News
Linked by Thom Holwerda on 06/18/13 22:33 UTC
Linked by Anonymous on 06/18/13 22:26 UTC
Linked by Thom Holwerda on 06/18/13 22:25 UTC
Linked by Thom Holwerda on 06/18/13 17:45 UTC
Linked by Thom Holwerda on 06/18/13 17:32 UTC, submitted by poundsmack
Linked by Thom Holwerda on 06/17/13 17:58 UTC
Linked by Thom Holwerda on 06/17/13 17:52 UTC
Linked by Thom Holwerda on 06/14/13 21:03 UTC
Linked by Thom Holwerda on 06/14/13 20:46 UTC
Linked by Thom Holwerda on 06/14/13 17:32 UTC
More News »
Sponsored Links



File versioning was the best VMS feature besides clustering. However, I think logicals are pretty cool.
In Unix, environment variables are all process-specific. In VMS, logicals act as environment variables. There are two types of logicals, SYSTEM and PROCESS.
SYSTEM logicals, as the name implies, are visible system-wide so that any process could potentially pick them up (assuming the process has the right privs). PROCESS logicals are similar to Unix environment variables in that they are specific to a particular process.
- For cluster system management, it is possible to change any system logical across your entire cluster without end-users having to do a thing. No re-login necessary. This is extremely useful.
- The file system can handle logicals directly, since logicals are part of the core OS rather than just part of the shell.
- A logical can point to a list of directories or files. This list of files or directories acts as a search path similar to the PATH variable, except much more generic.
IMHO, VMS logicals are environment variables done right.