gerd@gm2015:~/Programming/Perl> ./FirstTrial
./FirstTrial: line 1: #!/usr/bin/perl: No such file or directory
./FirstTrial: line 2: use: command not found
./FirstTrial: line 6: say: command not found
gerd@gm2015:~/Programming/Perl> which perl
/usr/bin/perl
gerd@gm2015:~/Programming/Perl> echo $PATH
/home/gerd/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
gerd@gm2015:~/Programming/Perl> perl FirstTrial
Hello
gerd@gm2015:~/Programming/Perl> more FirstTrial
#!/usr/bin/perl -w
use 5.18.2;
#use strict;
#use warnings;
#use utf8;
say "Hello";
gerd@gm2015:~/Programming/Perl>