垂直输出到水平输出

Question

For the following piece of code, I'm getting the output one below the other (vertically); however what I want is all in a single line (horizontally).

use strict;
use warnings;   
use Getopt::Std;

use vars qw($opt_a $opt_d $opt_m $opt_n $opt_o $opt_s $opt_t $opt_l);
my $drives = `wmic volume get name`; 
$drives =~ s/Name //;
print $drives;

It should be:

C:\ D:\ F:\ Q:\ X:\

However, what I'm getting is:

C:\ 
D:\ 
F:\ 
Q:\ 
X:\

Answer 1

Replace new line characters with space by using tr/// :

$drives =~ s/Name //;
$drives =~ tr/\r\n/ /;
print $drives;

or by using s/// :

$drives =~ s/Name //;
$drives =~ s/[\r\n]/ /g;
print $drives;

Note: \\r and \\n are new line characters.

Answer 2

For this purpose it's most simple to use the backticks operator in list context; ie assign the output to an array. That way you will get one line of output per array element

You also probably want to remove network shares, so a grep for lines starting with a letter and a colon will extract those

Finally, if you look at the output of wmic using Data::Dump or similar, you will see that the lines are padded with spaces so that they are all as long as the longest line. You can use these unwanted spaces using a subtitution, which will also remove the trailing CR and LF

Like this

use strict;
use warnings;

my @drives = grep /^[A-Z]:/, `wmic volume get name`;
s/\s+\z// for @drives;

print "@drives\n";

output

This is the output of the above code on my own Windows system

X:\ E:\ D:\ L:\ R:\ C:\ P:\ H:\ I:\ S:\ T:\ U:\ J:\ M:\ N:\ O:\ F:\ G:\ Q:\