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How to know the program 'perl' is installed ?

 
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# 1  
Old 12-11-2005
How to know the program 'perl' is installed ?
Hi,

How can I know the perl interpreter is installed in the system?

When I type 'find / -name perl -print 2>/dev/null', there is 6 lines listing:
/usr/local/bin/perl
/usr/bin/perl
/usr/lib/perl-5.8.0/bin/perl
/usr/opt/IAFW310/PERL/perl
/usr/opt/IAFW310/PERL/t/perl
/usr/opt/PERL5004/bin/perl

But when I type 'whereis perl', a line showing:
perl: /usr/bin/perl /usr/share/man/man1/perl.1.gz

Then I type 'perl' in the command prompt. It have no response.
Is this mean the perl is installed on the system?

Thk a Lot!
# 2  
Old 12-11-2005
From your description, it seems like perl is installed.

Just typing "perl" without anything else will drop you into immediate line entry mode - that lets you enter Perl code line by line for execution when you hit Ctrl-D (end-of-file).

A better way to test if Perl is there is to type "perl -v" that it will output the Perl version and quit, without keeping you in the line entry mode.
# 3  
Old 12-12-2005
Yes, when I type perl -v a list of message is appeared.
I think perl is installed on my system.

thk a lot
# 4  
Old 12-13-2005
Rather than using "find" to see if a program is installed, it's far better to use the builtin package query tools to see if it's been installed....

# RPM based linux distros....
rpm -qa | grep -i perl

# Solaris
pkginfo | grep -i perl

Of course, if you've built from source or installed in some non-standard way you cannot rely on the package query tools and then you would have to resort to 'find'.

Cheers
ZB
 
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