Why the hash command returns 0 for this
$ hash -r
$ ls -l ./kkk
./kkk: No such file or directory
$ hash ./kkk
$ echo $?
0
The hash utility will return true if the given utility is found in $PATH after doing a path search for it.
Since you give the name of the utility with a path, the shell would not do a path search for it, but instead use the path that you provided (./). It's not until the shell actually tries to run the utility at that path that it discovers that it doesn't exist.
The POSIX specification for hash says
If utility contains one or more
<slash>characters, the results are unspecified.
... and bash obviously implements the unspecified behaviour as "if no path search needs to happen to find the utility, return a zero exit status".
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