カレントディレクトリを表す記号

　今さらですがピリオド「.」がカレントディレクトリを表している事を知りました。相対パスを指定するときはフォルダ名やファイル名から書いていましたが、先頭にピリオド「.」を書く事でカレントディレクトリからパスが始まっていることを明示することができます。逆に言うと先頭にピリオド「.」をつけない場合は自動的に先頭にピリオド「.」が挿入されていると考える事ができます。つまり次の二つのパスはどちらもカレントディレクトリの Hoge.txt ファイルを指しています。

.\Hoge.txt

Hoge.txt

　最近ピリオド「.」を先頭に付けているパスを見て不思議に思っていたのがやっとスッキリしました。

投稿日時 : 2007年7月31日 23:08

Comments

# re: カレントディレクトリを表す記号

IIJIMAS

コンマ「,」じゃなくて、ピリオド「.」ですよね？

#コピペして変換キーを押してみましたが…

#大学時代、大学の先生が..をピリピリとかよんでたの思い出しました。

Posted @ 2007/07/31 23:31

# re: カレントディレクトリを表す記号

やまだ

「.」だけだとカレントディレクトリ（フォルダ？）をあらわしますが、「..」だけだとカレントの一つ親をあらわしますよね。
なので、
.\..\.\.\..\Hoge.txt
とか書くとわけのわからないことになります。
＃えーと、検証してないですが、たぶんカレントから合計２つ親のHoge.txtを探しにいくことになると思います。
あと、「.」はファイル名中で拡張子を切り分けるためのセパレータとしても機能しますので、同様に、
Hoge.aspx.exe.vb.cs.txt
とかしてもわけわからなくなりますよね。
＃「拡張子を隠す」設定にしている場合には特に。

で、何が言いたかったかというと、.NETという名前はファイル名として使いたくないな、と。のっけから「.」なので紛らわしいことこの上ないですから。

Posted @ 2007/08/01 1:36

# re: カレントディレクトリを表す記号

melt

ファイルのインクルードで、複数のフォルダにパスを通して、どちらにも同じ名前のファイルがあるとき、
#include "Hoge.h"
とかやってしまうと、どっちがインクルードされるか曖昧だし、もしカレントにあるファイルを消してしまうと、意図しないファイルをインクルードしてしまうので、そういう場合、自分はいつも
#include ".\Hoge.h"
ってやってます。

＞コンマ「.」をつけない場合は自動的に先頭にコンマ「.」が挿入されていると考える事ができます。
多分、カレントを優先的に読みに行くような設定でなければ自動的に「.」が付くと考えることは出来ないかと……。

Posted @ 2007/08/01 8:45

# re: カレントディレクトリを表す記号

ダッチ

IIJIMAS さん
> コンマ「,」じゃなくて、ピリオド「.」ですよね？
あれ？「,」はカンマで「.」がコンマだと思っていましたけど間違ってますか？

> #コピペして変換キーを押してみましたが…
ピリオドしか出てこないですね。orz
正直、コンマかピリオドかドットかなんていったら言いか迷ったんですが、ピリオドが一般的ということですね。

やまださん
> 「.」だけだとカレントディレクトリ（フォルダ？）をあらわしますが、「..」だけだとカレントの一つ親をあらわしますよね。
昔の Windows は「.」の数だけ階層が上がっていっていく仕様だったみたいですよ。一階層上：「..」二階層上：「...」三階層上：「....」という具合に。

melt さん
> カレントにあるファイルを消してしまうと、意図しないファイルをインクルードしてしまうので、
そういう結果になってしまうんですね。
「.」を付けても付けなくても結果は変わらないと思っていたのですが、もう少し勉強しておきます。

Posted @ 2007/08/01 10:12

# re: カレントディレクトリを表す記号

とっちゃん

コンマ何秒の「.」は、日本語の訛りですよｗ

ピリオドなら世界共通でたぶん通じます(発音を除けばｗ)。

が、ふつうは、ドットか、ポイントっす。

え？おいらはなんて言ってるかって？

そりゃぁもちろん、「テン」ですよ。

テン円ほげテンティーエックスティー

だな。

Posted @ 2007/08/01 11:32

# re: カレントディレクトリを表す記号

ダッチ

とっちゃん
> コンマ何秒の「.」は、日本語の訛りですよｗ
コンマは全然ダメだったんですね。
今読み直してみたらドットって言っちゃいました。
でもとりあえず世界共通ということでコンマをピリオドに変更しました。
# ドットも捨てがたいな、ドットネットだもんな・・・

Posted @ 2007/08/01 12:51

# re: カレントディレクトリを表す記号

通り＊

> 「,」はカンマで「.」がコンマだと思っていましたけど
以前は私も同じように思っていました。
私だけかと思っていたので、うれしいですｗ

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