readlink -f和readlink -m 的实际区别是什么?我实测测不出来?

[科学之子]

readlink -f和readlink -m 的实际区别是什么?我实测测不出来?

代码： 全选

       -f, --canonicalize
              canonicalize by following every symlink in every component of the given name recursively; all but the last component must exist

       -e, --canonicalize-existing
              canonicalize by following every symlink in every component of the given name recursively, all components must exist

       -m, --canonicalize-missing
              canonicalize by following every symlink in every component of the given name recursively, without requirements on components existence

但我这里测试"最后一个"不存在,输出结果也没有影响
比如"readlink -f /abc",还是照样会输出

[vickycq]

all but the last component must exist
但我这里测试"最后一个"不存在,输出结果也没有影响
比如"readlink -f /abc",还是照样会输出

all but the last component must exist 等同于 all must exist, except the last component
原文的意思应该是“最后一个可以不存在”。即：

代码： 全选

$ readlink -f /aaa/bbb; echo $?
1
$ readlink -f /home/bbb; echo $?
/home/bbb
0

参考
http://en.eywedu.net/duanyu/421e0064zw_0074.htm
https://en.oxforddictionaries.com/definition/all_but
https://jakubmarian.com/all-but-vs-anyt ... n-english/
http://unix.stackexchange.com/questions ... nk-command