Error on CentOS 7. syntax error near unexpected token

[patsevanton]

./postgresqltuner.pl
./postgresqltuner.pl: line 25: use: command not found
./postgresqltuner.pl: line 26: use: command not found
./postgresqltuner.pl: line 30: my: command not found
./postgresqltuner.pl: line 31: syntax error near unexpected token "Getopt::Long",{}' ./postgresqltuner.pl: line 31: $nmmc+=try_load("Getopt::Long",{});'

cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)

yum install perl-DBD-Pg
Package perl-DBD-Pg-2.19.3-4.el7.x86_64 already installed and latest version
Nothing to do

perl -V
Summary of my perl5 (revision 5 version 16 subversion 3) configuration:

[Ruaphoc]

To start, CentOS 7.3 is over a year out of date. In any case, the errors look like it is being parsed as a shell script, not as Perl... Try:

"perl ./postgresqltuner.pl"

See if the helps.

[patsevanton]

perl postgresqltuner.pl is work.
May be add to readme.md?

[mikelolasagasti]

I was able to reproduce and I think you were missing shebang at the beginning of the file.

[root@pg8 ~]# head -n1 /bin/postgresqltuner

[root@pg8 ~]# /bin/postgresqltuner
/bin/postgresqltuner: line 22: use: command not found
/bin/postgresqltuner: line 23: use: command not found
/bin/postgresqltuner: line 24: use: command not found
/bin/postgresqltuner: line 26: my: command not found
/bin/postgresqltuner: line 27: -: command not found
/bin/postgresqltuner: line 28: -: command not found
/bin/postgresqltuner: line 29: -: command not found
/bin/postgresqltuner: line 33: my: command not found
/bin/postgresqltuner: line 34: syntax error near unexpected token `"Getopt::Long",{}'
/bin/postgresqltuner: line 34: `$nmmc+=try_load("Getopt::Long",{});'

With correct shebang:

[root@pg8 ~]# head -n1 /bin/postgresqltuner
#!/usr/bin/env perl
[root@pg8 ~]# /bin/postgresqltuner
postgresqltuner.pl version 1.0.1
(...)

So there is no need to add perl reference to readme.