sub test2{ return "HTML"; } sub test { return join '', test2("1", "$ENV{'HTTP_HOSTS'} "); } print test(); #### C:\WINDOWS\system32\cmd.exe /c sh $ perl -w test.PL Use of uninitialized value in concatenation (.) or string at test.PL line 11. HTML$
## C:\WINDOWS\system32\cmd.exe /c sh $ perl -w test.PL Use of uninitialized value in concatenation (.) or string at test.PL line 11. HTML$