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   $status = system( "$program arg1 $arg2" );

open( SH, "| /bin/csh" ) or die "Can't start subshell: $!";
print SH "echo this is foo bar\n";
print SH "source some_script\n";
print SH "echo \$some_obscure_shell_variable_set_by_some_script\n";
#...