How to concatenate strings with Perl?

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Method #1 - using Perl's dot operator:
$name = 'checkbook';
$filename = "/tmp/" . $name . ".tmp";

Method #2 - using Perl's join function
$name = "checkbook";
$filename = join "", "/tmp/", $name, ".tmp";

Method #3 - usual way of concatenating strings
$filename = "/tmp/${name}.tmp";

2013-09-19, 1941👍, 0💬

If EXPR is an arbitrary expression, what is the difference between $Foo::{EXPR} and *{"Foo::".EXPR}?
If EXPR is an arbitrary expression, what is the difference between $Foo::{EXPR} and *{"Foo::".EXPR}? The second is disallowed under `use strict "refs"'. Dereferencing a string with *{"STR"} is disallowed under the refs stricture, although *{STR} would not be. This is similar in spirit to the way ${"... 2013-09-16, 2108👍, 0💬

Assume that $ref refers to a scalar, an array, a hash or to some nested data structure. Explain the following statements:
Assume that $ref refers to a scalar, an array, a hash or to some nested data structure. Explain the following statements: $$ref; # returns a scalar $$ref[0]; # returns the first element of that array $ref- > [0]; # returns the first element of that array @$ref; # returns the contents of that ... 2013-09-23, 2006👍, 0💬

What happens to objects lost in "unreachable" memory..... ?
What happens to objects lost in "unreachable" memory..... ? What happens to objects lost in "unreachable" memory, such as the object returned by Ob->new() in `{ my $ap; $ap = [ Ob->new(), \$ap ]; }' ? Their destructors are called when that interpreter thread shuts down. When the interp... 2013-09-20, 1973👍, 0💬

How do I do < fill-in-the-blank > for each element in an array?
How do I do < fill-in-the-blank > for each element in an array? #!/usr/bin/perl -w @homeRunHitters = ('McGwire', 'Sosa', 'Maris', 'Ruth'); foreach (@homeRunHitters) { print "$_ hit a lot of home runs in one year\n"; } 2013-09-16, 1965👍, 0💬

How do you match one letter in the current locale?
How do you match one letter in the current locale? /[^\W_\d]/ We don't have full POSIX regexps, so you can't get at the isalpha() <ctype.h> macro save indirectly. You ask for one byte which is neither a non-alphanumunder, nor an under, nor a numeric. That leaves just the alphas, which ... 2013-09-23, 1964👍, 0💬

How do I read command-line arguments with Perl?
How do I read command-line arguments with Perl? With Perl, command-line arguments are stored in the array named @ARGV. $ARGV[0] contains the first argument, $ARGV[1] contains the second argument, etc. $#ARGV is the subscript of the last element of the @ARGV array, so the number of arguments on the c... 2013-09-19, 1951👍, 0💬

How to concatenate strings with Perl?
How to concatenate strings with Perl? Method #1 - using Perl's dot operator: $name = 'checkbook'; $filename = "/tmp/" . $name . ".tmp"; Method #2 - using Perl's join function $name = "checkbook"; $filename = join "", "/tmp/", $name, ".tmp"; Method #3 - usual way of concatenating strings $filename = ... 2013-09-19, 1942👍, 0💬

When would `local $_' in a function ruin your day?
When would `local $_' in a function ruin your day? When your caller was in the middle for a while(m//g) loop The /g state on a global variable is not protected by running local on it. That'll teach you to stop using locals. Too bad $_ can't be the target of a my() -- yet. 2013-09-20, 1940👍, 0💬

What is the easiest way to download the contents of a URL with Perl?
What is the easiest way to download the contents of a URL with Perl? Once you have the libwww-perl library, LWP.pm installed, the code is this: #!/usr/bin/perl use LWP::Simple; $url = get 'http://www.websitename.com/'; 2013-09-18, 1915👍, 0💬

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