my problem is :

i have a small script automising the firefox invokation from my $HOME/bin
directory:
**********************
set FIREFOX_PATH='/tools/openbin/firefox/2.0.0.3/sparc-sun-solaris8'

set GTK_LIB_PATH='/tools/openbin/gtk+/1.2.10/sparc-sun-solaris8/lib'

set GLIB_LIB_PATH='/tools/openbin/glib/1.2.10/sparc-sun-solaris8/lib'


setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:$FIREFOX_PATH;
setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:$GTK_LIB_PATH;
setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:$GLIB_LIB_PATH;

cd $FIREFOX_PATH
./firefox-bin &
cd
***********************
my question is

case:1
when i invoke the script sourcing it

source start_firefox.sh

it works
**********************
case:2

when i do from $hOME/bin

tcsh start_firefox.sh

.......it works
*******************
case:3

but when i do from $HOME/bin..here the script resides

./start_firefox.sh

error messages are coming like
*********
csbu061 [mhalder] 206: ./start_firefox.sh
./start_firefox.sh: setenv: not found
./start_firefox.sh: setenv: not found
./start_firefox.sh: setenv: not found
./start_firefox.sh: ./firefox-bin: not found
....i can understand its working while sourcing but i am confused why its working in the 2nd case while its not working in the 3 rd case

...please make me clear abt this

setenv is a tcsh built-in command, so you can only run it in a shell.
In cae 1, source tells your current (tcsh) shell to interpret and execute the commands in the file.
In case 2, you are creating a new tcsh shell which interprets and executes the commands in the file.
In case 3, it is not clear what is supposed to interpret the commands in the file, so it looks like a default sh shell is created to run them. setenv does not exist in sh,, hence the error message.
Putting at the top of your file will solve this and is effectively the same as case 2.

i tried that way but its not working ..
in my shell

csbu061 [mhalder] 277: cd /usr/bin
/usr/bin
csbu061 [mhalder] 278: ls | grep tcsh
tcsh

****my script after introducing the shebang line

#! /usr/bin/tcsh

set FIREFOX_PATH='/tools/openbin/firefox/2.0.0.3/sparc-sun-solaris8'

set GTK_LIB_PATH='/tools/openbin/gtk+/1.2.10/sparc-sun-solaris8/lib'

set GLIB_LIB_PATH='/tools/openbin/glib/1.2.10/sparc-sun-solaris8/lib'


setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:$FIREFOX_PATH;
setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:$GTK_LIB_PATH;
setenv LD_LIBRARY_PATH ${LD_LIBRARY_PATH}:$GLIB_LIB_PATH;

cd $FIREFOX_PATH
./firefox-bin &
cd


*****
from the shell in $HOME/bin
csbu061 [mhalder] 117: pwd
/users/mhalder/bin

csbu061 [mhalder] 120: ls | grep 'start_a*'
start_firefox.sh
start_thunderbird.sh

csbu061 [mhalder] 152: ./start_firefox.sh
./start_firefox.sh: setenv: not found
./start_firefox.sh: setenv: not found
./start_firefox.sh: setenv: not found
./start_firefox.sh: ./firefox-bin: not found
csbu061 [mhalder] 153: