QNX4 operating system using Korn Shell. This is in a .profile file.
export VARDIR=//1/usr/pvcs
What does the //1/ represent?
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6Related: On what systems is //foo/bar different from /foo/bar?Stéphane Chazelas– Stéphane Chazelas2018-01-31 23:10:08 +00:00Commented Jan 31, 2018 at 23:10
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2 Answers
For the most part, multiple slashes are equivalent to a single slash. There's one exception: paths beginning with exactly two slashes (//foo/…, as opposed to /foo/… or ///foo/…) have a different meaning on some Unix variants. The meaning is often to access a remote resource with a path like //hostname/dir1/dir2/dir3/file. (Windows does this too, with \\hostname\dir1\dir2\dir3\file.)
QNX is one of those variants. On QNX4 with the FLEET distributed processing protocol, // followed by a number refers to that node. So //1/usr/pvcs on any node refers to the file /usr/pvcs on node 1.
(Source: the QNX6 manual, I can't find official QNX4 documentation online.)
answered Jan 31, 2018 at 20:56
Gilles 'SO- stop being evil'
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To all indications, the variable is receiving a web path as content.
//aaaa/bbbb/cccc/nnnn -
at where:
aaaa = server name or IP address;
bbbb = folder from the logical root of the domain aaaa (web servers can handle this dynamically);
cccc = bbbb subfolder;
nnnn = nth subfolder.
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3It is not an URL, but a special path handled in a particular way on QNX systems.2018-02-07 10:45:13 +00:00Commented Feb 7, 2018 at 10:45