scripts/interpreted/ds

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#!/usr/bin/perl
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# ds - calculate and display the size of a given directory in a human readable format
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# Copyright Frederick Boniface 2023 - fredboniface.co.uk
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
use strict;
use warnings;
use File::Find;
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if (@ARGV == 0) {
print <<EOF;
\nUsage: $0 <directory_path>
Calculate the size of a directory and its contents.\n
EOF
exit;
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}
my $dir_path = $ARGV[0];
unless (-d $dir_path) {
die "$dir_path is not a directory\n"
}
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if ($dir_path eq '/') {
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die "You are not able to run 'ds' on the root directory\n"
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}
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my $total_size = 0;
sub calculate_size {
my $file = $File::Find::name;
return if -l $file;
if (-f $file) {
$total_size += -s $file;
}
}
find(\&calculate_size, $dir_path);
sub format_size {
my $size = shift;
my @units = qw(B KB MB GB TB);
my $unit_index = 0;
while ($size >= 1024 && $unit_index < @units -1) {
$size /= 1024;
$unit_index++;
}
return sprintf("%.2f %s", $size, $units[$unit_index]);
}
print "Total size of $dir_path:\n", format_size($total_size), "\n"