If you're in a csh shell (or most other shells), then yes, entering source sge_sigma.csh at the command line will cause the contents of that file to be interpreted and take effect in the current shell.
bannor:~/work/perl/monks$ csh
bannor:~/work/perl/monks> cat test.csh
setenv MYTEST "This is a test."
bannor:~/work/perl/monks> echo $MYTEST
MYTEST: Undefined variable.
bannor:~/work/perl/monks> source test.csh
bannor:~/work/perl/monks> echo $MYTEST
This is a test.
You can't do this from within a Perl script, because it's a sub-process of the shell, so it can't change its parent's environment. To put it another way, you can change environment variables within a Perl script by use of the %ENV hash, and those will be inherited by any child processes that your Perl script spawns, but they can't go "upstream" to the parent process.
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