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which CMD in csh

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# 1  
Old 04-21-2010
which CMD in csh
Today I encounter one problem, I ran one script like follows:

Code:
#!/bin/csh -f

which ls

It supposes to skip the .cshrc and .login files when run this script with the "-f" option, but it does NOT.

I can see the "which" cmd first source the .cshrc ( I marked one "echo " in .cshrc ), then print out the "ls" path.
And with "-f" option, it still can inherit the ENV variables but can't get the defined variables from the current shell.

My question is
How to avoid the script to inherit the ENV variables from the current shell, or at least avoid to "source .cshrc" when ran "which" cmd?

Thanks very much
# 2  
Old 04-21-2010
Hi.

It seems to work for me (edited for readability):
Code:
Last login: Wed Apr 21 10:17:59 2010 ...
Sun Microsystems Inc.   SunOS 5.10      Generic January 2005
 .cshrc invoked, version 2010.04.21.
 .login invoked, version 2010.04.21.

vm-solaris% csh
 .cshrc invoked, version 2010.04.21.
vm-solaris% cat .cshrc

#ident  "@(#).cshrc        1.2     00/05/01 SMI"
echo " .cshrc invoked, version 2010.04.21."
umask 022
set path=(/bin /usr/bin /usr/ucb /etc .)
if ( $?prompt ) then
        set history=32
endif

vm-solaris% exit
vm-solaris% vm-solaris% csh
 .cshrc invoked, version 2010.04.21.

vm-solaris% exit
vm-solaris% vm-solaris% csh -f
vm-solaris% version =o
OS, ker|rel, machine: SunOS, 5.10, i86pc

Scripts worked the same -- no message if "-f" was supplied on shebang line.

Are you using csh or tcsh? ... cheers, drl
# 3  
Old 04-21-2010
Thanks for your reply, drl.

I am using csh, not tcsh.
'which' will have different behavior on different machines.
I tried on AIX5300, before it gave out the "ls" path, it will first source ".cshrc"; but on Debian, it's OK.

And for ENV variables, it will inherit from the parent shell no matter "-f" issued;
for normal variables, it won't inherit from parent shell if "-f" issued.
# 4  
Old 04-22-2010
Hi.

Here is the result of running on an AIX system to which I have access:
Code:
#!/bin/sh

echo
echo " System name, release, version:"
uname -s
oslevel

echo
echo " .cshrc:"
cat $HOME/.cshrc

echo
echo " Script s1, and results:"
cat s1
echo
./s1

echo
echo " Script s2, and results:"
cat s2
echo
./s2

exit 0

producing:
Code:
$ ./s0

 System name, release, version:
AIX
5.1.0.0

 .cshrc:
#ident  "@(#).cshrc     1.2     00/05/01 SMI"
echo " .cshrc invoked, version 2010.04.21."
umask 022
set path=(/bin /usr/bin /usr/ucb /etc .)
if ( $?prompt ) then
        set history=32
endif


 Script s1, and results:
#!/bin/csh

echo " Hello, world."

 .cshrc invoked, version 2010.04.21.
 Hello, world.

 Script s2, and results:
#!/bin/csh -f

echo " Hello, world."

 Hello, world.

So this works as I expect it.

I see that on AIX, the command which is itself a csh script. The first few lines are:
Code:
#!/usr/bin/csh -f
set prompt = "% "
if ( -f ~/.cshrc) then
        source ~/.cshrc
endif
...

If it's the same on your system, then I think you have the reason for the behavior you have seen ... cheers, drl
Last edited by drl; 04-22-2010 at 12:28 AM..
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