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Added environment variable manipulation to hello.pl script.

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This commit is contained in:
Ed Braaten 2015-04-27 22:33:02 -07:00
parent 6538e6034d
commit 010ed93aaf
1 changed files with 21 additions and 0 deletions
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21
perl/hello.pl
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@ -41,6 +41,27 @@ foreach (keys %fruit_color) {
print "$_ = $fruit_color{$_}\n"; print "$_ = $fruit_color{$_}\n";
} }
# Read a non-existent environment variable and supply default value...
my $some_env_var;
if (defined $ENV{'PROBABLY_NOT_THERE'}) {
$some_env_var = $ENV{'PROBABLY_NOT_THERE'};
} else {
$some_env_var = "Default value";
}
print "\nPROBABLY_NOT_THERE is set to \'$some_env_var\'\n\n";
# Let's read in the PATH variable from the OS and print it out...
my $path_env_var = $ENV{'PATH'};
print "OS PATH var is set to: \'$path_env_var\'\n\n";
# Let's manipulate PATH variable and then restore it
print "Adding :/test to PATH variable\n";
$ENV{'PATH'} = "$ENV{'PATH'}:/test";
print "OS PATH var is set to: \'$ENV{'PATH'}\'\n\n";
print "Restoring original PATH value.\n";
$ENV{'PATH'} = $path_env_var;
print "OS PATH var is set to: \'$path_env_var\'\n\n";
# Let's create the file test.out and write animals array to it... # Let's create the file test.out and write animals array to it...
print "\nWriting test.out file...\n"; print "\nWriting test.out file...\n";
open(my $out, ">", "test.out") or die "Can't create/open test.out! $!\n"; open(my $out, ">", "test.out") or die "Can't create/open test.out! $!\n";