W dniu 2013-12-05 19:38, Scott Ford pisze:
I always thought VMS was *nix like??? If not what opsys is it similar too or is
it's own thang
In simple words: No. VMS is similar to ...VMS, and maybe older DEC
systems which I don't know (RSX-11 AFAIR).
Few concepts of VMS:
Unix has single root, VMS has "drives" similar to DOS/Windows (AFAIR not
drive LETTER, but drive NAME)
both systems use directory, subdirectory concept to for grouping files
another syntax, square parentheses are used for pathname
interesting thing: [...] means "this directory and all subdirectories.
Can be used for i.e. DEL *.BAK in whole tree.
Filename is file.extension both components up to 40 characters. only two
components (qualifiers) allowed. Second qualifier plays role similar to
DOS extension, i.e. LOGIN.COM is king of .profile or AUTOEXEC.BAT and
it's executable script. Files also have third part: version, usually
omitted. Full name is FILE.EXTENSION;version (a number).
All file names were uppercase charcters allowed wer similar to MVS. No
tricky names possible (try to use filename * in Unix and then delete it).
Directories can be nested up to 8 levels. further nesting is allowed,
but indirectly: you have to create 'symbolic' drive at some directory level.
Most files are plain like in unix or DOS/Windows, but some file can have
internal structure - like PS, or VSAM.
Commands are much longer than in Unix.
Command syntax is similar to DOS, but command names and parameters tend
to be longer.
--
Radoslaw Skorupka
Lodz, Poland
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