In particular they are written in Kernighan and Ritchie C, not the newer ANSI standard C.
This is seldom true these days.
Under HPUX, two other files are also read by the C-shell. These are called `/etc/csh.login' and `/etc/src.csh', enabling some standard set-up to be configured globally. GNU/Linux has a similar system. On solaris systems `/etc/.login' is read.
Newer versions of the Bourne shell, like the Korn shell and Bourne-again-shell do have these facilities.
This does not seem to work in solaris?!
You could also set the sticky bit `1777' in order to prevent malicious users from deleting your file.
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