namei: add page

pages/linux/namei.md

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+# namei
+
+> Follows a pathname (which can be a symbolic link) until a terminal point is found (a file/directory/char device etc).
+> This program is useful for finding "too many levels of symbolic links" problems.
+
+- Resolve the pathnames specified as the argument parameters:
+
+`namei {{path/to/a}} {{path/to/b}} {{path/to/c}}`
+
+- Display the results in a long-listing format:
+
+`namei --long {{path/to/a}} {{path/to/b}} {{path/to/c}}`
+
+- Show the mode bits of each file type in the style of `ls`:
+
+`namei --modes {{path/to/a}} {{path/to/b}} {{path/to/c}}`
+
+- Show owner and group name of each file:
+
+`namei --owners {{path/to/a}} {{path/to/b}} {{path/to/c}}`
+
+- Don't follow symlinks while resolving:
+
+`namei --nosymlinks {{path/to/a}} {{path/to/b}} {{path/to/c}}`