特定のディレクトリへのパスを設定するようにcshrcを設定します。

特別なエイリアスを使用できますcwdcmd。からtcsh(1)：

   cwdcmd  Runs after every change of working directory.  For example,  if
           the  user is working on an X window system using xterm(1) and a
           re-parenting window manager that supports title  bars  such  as
           twm(1) and does

               > alias cwdcmd  'echo -n "^[]2;${HOST}:$cwd ^G"'

           then the shell will change the title of the running xterm(1) to
           be the name of the host, a colon, and the full current  working
           directory.  A fancier way to do that is

               >          alias          cwdcmd          'echo          -n
               "^[]2;${HOST}:$cwd^G^[]1;${HOST}^G"'

           This will put the hostname and working directory on  the  title
           bar but only the hostname in the icon manager menu.

           Note  that  putting  a cd, pushd or popd in cwdcmd may cause an
           infinite loop.  It is the author's opinion that anyone doing so
           will get what they deserve.

私はあなたに提案します~/.tcshrc：

set basepath = (/sbin /bin /usr/sbin /usr/bin)
set path = ($basepath)

alias cwdcmd source ~/.tcsh/cwdcmd.tcsh

# Do this on startup as well
cwdcmd

それから~/.tcsh/cwdcmd.tcsh：

# Reset path
set path = ($basepath)

# cwd is exactly this
if ( "$cwd" == "/home/martin/code" ) then
    set path = ($path /code-path)
# cwd starts with this
else if ( "$cwd" =~ "/home/martin/tmp*" ) then
    set path = ($path /tmp-path)
endif