create directory with input

darkblackblue has asked for the wisdom of the Perl Monks concerning the following question:

Replies are listed 'Best First'.
Re: create directory with input by LanX (Sage) on Dec 03, 2017 at 11:33 UTC
\backslashes escape inside Perl strings and things like "\U" mean uppercase the following characters. Maybe try to escape the backslashes `"C:\\Users\\darkblack\\...` or use Unix style paths. `"C:/Users/darkblack/...` Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^2: create directory with input by darkblackblue (Novice) on Dec 03, 2017 at 12:55 UTC
It didnt work when I used `my $dir = "C:\\Users\\darkblack\\Desktop\\".$directory_name; or my $dir = "C:\\Users\\darkblack\\Desktop\\.$directory_name";` [download]	[reply] [d/l]
Re^3: create directory with input by poj (Abbot) on Dec 03, 2017 at 13:14 UTC
It didnt work What was the error message,"Invalid argument" ?. Try adding `chomp` `#!perl use strict; use warnings; my $cwd = 'C:/Users/darkblack/Desktop'; print "Enter directory name > "; chomp(my $dir = <STDIN>); $dir = "$cwd/$dir"; mkdir( $dir , 0755 ) or die "Could not create $dir : $!"; print "Directory $dir created successfully\n";` [download] poj	[reply] [d/l] [select]
Re^4: create directory with input by darkblackblue (Novice) on Dec 03, 2017 at 14:36 UTC
Re^3: create directory with input by LanX (Sage) on Dec 03, 2017 at 13:10 UTC
What didn't work? See Basic debugging checklist Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Wikisyntax for the Monastery}	[reply]
Re: create directory with input by AnomalousMonk (Archbishop) on Dec 03, 2017 at 17:35 UTC
To the specific root-cause solutions offered by others, I would add that enabling warnings along with its good friend strict will let Perl at least give you some hints about problems like this: `c:\@Work\Perl\monks>perl -le "use warnings; use strict; ;; my $directory_name = 'foobar'; my $dir = \"C:\Users\darkblack\Desktop\A\.$directory_name\"; print qq{'$dir'}; " Unrecognized escape \d passed through at -e line 1. Unrecognized escape \D passed through at -e line 1. Unrecognized escape \A passed through at -e line 1. 'C:SERSDARKBLACKDESKTOPA.FOOBAR'` [download] Also, see Quote and Quote-like Operators in perlop for double-quotish escapology info. Give a man a fish: `<%-{-{-{-<`	[reply] [d/l] [select]
Re: create directory with input by CountZero (Bishop) on Dec 04, 2017 at 11:04 UTC
File::Spec provides a convenient interface to constructing directory names and filenames and it works in many operating systems: `$path = File::Spec->catfile( @directories, $filename );` [download] In the present case it would go like this: `use Modern::Perl qw/2017/; use File::Spec; my $directory_name = 'testdir'; my $path = File::Spec->catfile( qw/C: Users darkblack Desktop A/, $directory_na +me ); say $path;` [download] Output (in Windows): `C:\Users\darkblack\Desktop\A\testdir` But running under Unix it will return `C:/Users/darkblack/Desktop/A/testdir` File::Spec::Functions provides an even easier functional interface. CountZero A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James My blog: Imperial Deltronics	[reply] [d/l] [select]
Re: create directory with input by kcott (Archbishop) on Dec 04, 2017 at 07:38 UTC
G'day darkblackblue, This looks like you're running into a backslashitis nightmare. I think I'd aim for something closer to: `my $path_base = 'C:\Users\darkblack\Desktop\A\.'; ... my $dir = $path_base . $directory_name;` [download] I don't have an MSWin box to test this on; however, the basic concept works fine on my system: `$ pwd /Users/ken/tmp $ ls -al .fred ls: cannot access '.fred': No such file or directory $ perl -e 'my $x = q{/Users/ken/tmp/.}; my $y = q{fred}; mkdir $x . $y +' $ ls -al .fred total 0 drwxr-xr-x 2 ken staff 68 Dec 4 18:27 . drwxr-xr-x 19 ken staff 646 Dec 4 18:27 ..` [download] — Ken	[reply] [d/l] [select]


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