mkdir usage

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Re: mkdir usage by BrowserUk (Pope) on Dec 21, 2012 at 02:02 UTC
`if (! -d abc) {` should be `if (! -d 'abc') {` `use warnings;` would have caught that: `C:\test>perl -wE"if( -d abc ) { say 'hi' }" Unquoted string "abc" may clash with future reserved word at -e line 1 +. Name "main::abc" used only once: possible typo at -e line 1. -d on unopened filehandle abc at -e line 1.` [download] You cannot create a directory if a file of the same name already exists. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice. RIP Neil Armstrong	[reply] [d/l] [select]
Re: mkdir usage by toolic (Chancellor) on Dec 21, 2012 at 02:07 UTC
You could also consider using File::Path`::make_path`	[reply] [d/l]
Re^2: mkdir usage by frozenwithjoy (Chaplain) on Dec 21, 2012 at 05:45 UTC
Ya, this is my preferred option, because you don't need to test whether the directory already exists since it will make the directory if it needs to and won't complain if it already exists.	[reply]
Re: mkdir usage by 2teez (Chaplain) on Dec 21, 2012 at 02:11 UTC
just a side comment: Using mkdir, MASK default to "0777", if omitted. So, you really don't have to specify in your OP. If you tell me, I'll forget. If you show me, I'll remember. if you involve me, I'll understand. --- Author unknown to me	[reply]
Re: mkdir usage by LanX (Monsignor) on Dec 21, 2012 at 02:25 UTC
As a side note: your condition will also be true on other files than directories, but mkdir will of course fail with a 'File exists' error. Cheers Rolf	[reply]
Re^2: mkdir usage by skyworld_chen (Acolyte) on Dec 21, 2012 at 02:37 UTC
I got the idea. Thanks for all of your kind replies.	[reply]
Re: mkdir usage by jwkrahn (Prior) on Dec 21, 2012 at 05:25 UTC
`mkdir "abc", "0777" or die "Can't mkdir abc: $!";` [download] The second argument to mkdir expects a numerical value so providing a string means it will be interpreted as a number and the string `"0777"` is numerically different than the number `0777`: `$ perl -le'print 0 + "0777"' 777 $ perl -le'print 0 + 0777' 511 $ perl -e'mkdir "testone", 0777 or die "Cannot mkdir testone because: +$!"' $ ls -dl testone drwxr-xr-x 2 john john 4096 2012-12-20 21:12 testone $ rmdir testone $ perl -e'mkdir "testone", "0777" or die "Cannot mkdir testone because +: $!"' $ ls -dl testone dr----x--t 2 john john 4096 2012-12-20 21:13 testone $ rmdir testone` [download]	[reply] [d/l] [select]
Re: mkdir usage by Marshall (Prior) on Dec 21, 2012 at 06:37 UTC
!/usr/bin/perl -w # I most often use "-w" on first line the rather than "use warnings;". # There can be difference later when using other modules. # In this case, there is no difference. # `if (! -d abc) { mkdir "abc", "0777" or die "Can't mkdir abc: $!"; }` [download] coud have been: `if (! -d "abc") { mkdir "abc", "0777" or die "Can't mkdir abc: $!"; }` [download]	[reply] [d/l] [select]
Re^2: mkdir usage by Marshall (Prior) on Dec 21, 2012 at 06:54 UTC
These various quoting gizmos do make a difference.	[reply]


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