05/02/19 23:38:58 .net
ググってみたが、原文は
URLﾘﾝｸ(cm.bell-labs.com)
にあるな。
この中の「Process control」の項がその話。
The most memorable of these became evident soon after
the new system came up and apparently worked. In the
midst of our jubilation, it was discovered that the
chdir (change current directory) command had stopped
working. There was much reading of code and anxious
introspection about how the addition of fork could
have broken the chdir call. Finally the truth dawned:
in the old system chdir was an ordinary command; it
adjusted the current directory of the (unique) process
attached to the terminal. Under the new system, the
chdir command correctly changed the current directory
of the process created to execute it, but this process
promptly terminated and had no effect whatsoever on
its parent shell! It was necessary to make chdir a
special command, executed internally within the shell.
jubilation は大喜びとか祝祭って意味ね。