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what are these modules in perl script

I have written a script to send me an email when a new post in a forum comes out. however, when I run this script I got the folloing error:

[jyu@jenkins-test ~]$ crontab -l
40 */2 * * * /home/jyu/script/mit.pl
[jyu@jenkins-test ~]$ /home/jyu/script/mit.pl
/home/jyu/script/mit.pl: line 4: use: command not found
/home/jyu/script/mit.pl: line 5: use: command not found
/home/jyu/script/mit.pl: line 6: use: command not found
/home/jyu/script/mit.pl: line 7: use: command not found
/home/jyu/script/mit.pl: line 8: use: command not found
/home/jyu/script/mit.pl: line 9: use: command not found
/home/jyu/script/mit.pl: line 12: use: command not found
/home/jyu/script/mit.pl: line 14: my: command not found
/home/jyu/script/mit.pl: line 16: my: command not found
/home/jyu/script/mit.pl: line 18: my: command not found
/home/jyu/script/mit.pl: line 20: my: command not found
/home/jyu/script/mit.pl: line 22: my: command not found
/home/jyu/script/mit.pl: line 24: my: command not found
/home/jyu/script/mit.pl: line 26: syntax error near unexpected token `"xiaoyaogu",'
/home/jyu/script/mit.pl: line 26: `main( "xiaoyaogu", $encoding, $selector );'
[jyu@jenkins-test ~]$ perl /home/jyu/script/mit.pl
[jyu@jenkins-test ~]$ which perl
/usr/bin/perl
[jyu@jenkins-test ~]$ cd script/
[jyu@jenkins-test script]$ ls -alth
total 12K
drwxr-xr-x 2 jyu developers 4.0K Jul 31 20:25 .
drwxr-xr-x 9 jyu developers 4.0K Jul 31 20:25 ..
-rw-r--r-- 1 jyu developers    0 Jul 31 20:21 new
-rwxr-xr-x 1 jyu developers 2.2K Jul 31 19:50 mit.pl
[jyu@jenkins-test script]$ vi mit.pl
[jyu@jenkins-test script]$ sudo su
root@jenkins-test:/home/jyu/script$ perl -MCPAN -e shell
mit.pl.txt
0
Jason Yu
Asked:
Jason Yu
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2 Solutions
 
MazdajaiCommented:
You get the error first time because the system don't which interpreter to use.

#!/usr/bin/env perl 

Open in new window


It works the second time because you pass it to run perl directly. Add the following to the first line of the script -

[jyu@jenkins-test ~]$ perl /home/jyu/script/mit.pl

Open in new window

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Jason YuAuthor Commented:
Hi, Mazdajai:

I added your line to my script and it doesn't give me errors anymore, but I still didn't receive any emails about the new posts. How could I test if the email was blocked by the firewall?

The source code is in the attachment of the last post.

thanks.
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arnoldCommented:
The first line should be a complete path to perl
which perl
#!/usr/bin/perl

Make sure the commands you use inside I.e. Sendmail is a full path /usr/sbin/sendmail
Cron defaults to a limited path /bin:/usr/bin such that sendmail will not be found if referenced.

Cron based script should always use explicit and completes paths to command and directories/files that the script needs/uses.
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Jason YuAuthor Commented:
got it, thank you very much, it's working now.
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