Memo/Linux/symlink

シンボリックリンク(symbolic link/symlink)

シンボリックリンク(symbolic link/symlink) †

リンク切れを見つける †

find . -xtype l

↑

ワイルドカードでsymlinkを作成 †

-t オプションで可能

       -t, --target-directory=DIRECTORY
              specify the DIRECTORY in which to create the links

cd /tmp/links/
ls /tmp/test/file* | xargs ln -s -t .

↑

シンボリックリンクの絶対パスを相対パスに自動解決 †

環境
- CentOS 7
- macOS High Sierraのlnには「-r」オプションは無い。BSD系には無いかも。

検証用のディレクトリ構造を作成

mkdir -p dir1/dir2
cd dir1
touch dir1_file

「-r」オプションで絶対パスを相対パスに自動解決

ln -s -r dir1_file dir2/
ls -l dir2/
dir1_file -> ../dir1_file # dir1_fileへの相対パスが自動生成されている

↑

シンボリックリンクの置換 †

-n: ディレクトリのため必要
-f: 強制作成
```
ln -nfs src dest
```

↑

シンボリックリンク先が同じかのチェック †

test -ef を使う

ln -s /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
test /usr/share/zoneinfo/Asia/Tokyo -ef /etc/localtime
echo $? # 0

↑

シンボリックリンク先のパスを取得 †

readlink を使う。-fで常に絶対パスを取得

ls -l /usr/java/
合計 4
lrwxrwxrwx. 1 root root    6  9月  5 11:15 2012 default -> latest
drwxr-xr-x. 2 root root 4096  9月  5 11:07 2012 jdk-1.7.0
lrwxrwxrwx. 1 root root    9  9月  5 11:15 2012 latest -> jdk-1.7.0

readlink /usr/java/default
latest

readlink -f /usr/java/default
/usr/java/jdk-1.7.0

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Memo/Linux/symlink

シンボリックリンク(symbolic link/symlink) †

リンク切れを見つける †

ワイルドカードでsymlinkを作成 †

シンボリックリンクの絶対パスを相対パスに自動解決 †

シンボリックリンクの置換 †

シンボリックリンク先が同じかのチェック †

シンボリックリンク先のパスを取得 †

Software

Programming

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