In particular they are written in Kernighan and Ritchie C, not the newer ANSI standard C.
This is seldom true these days.
more very_ before the first TAB, a single
TAB would be sufficient.
This does not seem to work in solaris?!
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.
You could also set the sticky bit `1777' in order to prevent malicious users from deleting your file.
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