readlink
Created by : Mr Dk.
2023 / 04 / 14 19:55
Hangzhou, Zhejiang, China
Background
realpath 能够返回任意路径的绝对路径。
Usage
$ realpath --help
Usage: realpath [OPTION]... FILE...
Print the resolved absolute file name;
all but the last component must exist
-e, --canonicalize-existing all components of the path must exist
-m, --canonicalize-missing no components of the path need exist
-L, --logical resolve '..' components before symlinks
-P, --physical resolve symlinks as encountered (default)
-q, --quiet suppress most error messages
--relative-to=FILE print the resolved path relative to FILE
--relative-base=FILE print absolute paths unless paths below FILE
-s, --strip, --no-symlinks don't expand symlinks
-z, --zero separate output with NUL rather than newline
--help display this help and exit
--version output version information and exit
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'realpath invocation'
ChatGPT 给出的资料：
The realpath command in Linux is used to resolve the absolute path of a given file or directory, taking into account any symbolic links or relative paths that may be involved. It returns the canonical, or standardized, path for the specified file or directory.
Demo
得到一个已有文件的绝对路径：
$ touch README.md
$ realpath ./README.md
/home/mrdrivingduck/test/README.md
-e / -m 选项可以被用于控制是否允许目标文件不存在：
$ realpath -e ./README.m
realpath: ‘./README.m’: No such file or directory
$ realpath -m ./README.m
/home/mrdrivingduck/test/README.m
对于符号链接来说，-s 选项可以选择不展开符号链接：
$ ln -s polar-doc/docs/README.md README
$ realpath README
/home/mrdrivingduck/test/polar-doc/docs/README.md
$ realpath -s README
/home/mrdrivingduck/test/README