tcsh - SHELL: Undefined variable.

[Anton Shterenlikht]

I noticed recently that my tcsh does not
define SHELL anymore:

> echo $SHELL
SHELL: Undefined variable.

There is XTERM_SHELL:

> setenv|grep SHELL
XTERM_SHELL=/bin/tcsh

but that's it.

When I launch xterm from an existing shell,
it opens with /bin/sh and returns nothing at all for $SHELL:

$ echo $SHELL

$

This is weird because xterm manual says if shell
name is not given on the command line, it tries
to get it from /etc/passwd. My entry has /bin/tcsh:

> grep `whoami` /etc/passwd
<username, uid, gid, comment, home dir>:/bin/tcsh

My .tcshrc:

set path=(/sbin /bin /usr/sbin /usr/bin /usr/local/sbin /usr/local/bin \
 /usr/X11R6/bin /home/mexas/bin /usr/local/kde4/bin/)
setenv EDITOR vi
setenv PAGER more
setenv LSCOLORS "ExFxCxDxBxegedabagacad"
setenv LYNX_CFG ~/.lynx.cfg
setenv LC_CTYPE en_US.UTF-8 
setenv NNTPSERVER nntp.aioe.org 
alias su /usr/bin/su -

Please help

Anton