Chet Ramey wrote:
type -P echo
ls -l $(type -P echo)
If you already have `echo' in the command hash table, type -P will return
it, since that's what the shell will attempt to execute.
---
It's not in the hash table, but type -P still
returns the non-executable.
Ishtar:/> ll {,/usr}/bin/echo
-rw-r--r-- 2 136753 Nov 19 2013 /bin/echo
--w------- 2 136753 Nov 19 2013 /usr/bin/echo
sudo chmod +x /bin/echo
Ishtar:/> type -P echo
/bin/echo #correct
Ishtar:/> sudo chmod -x /bin/echo #take it away
Ishtar:/> hash -r #in theory, purge command hash
Ishtar:/> type -P echo #but doesn't use last lookup
/usr/bin/echo #switches to returning /usr/bin
copy
Assuming my hash -r was ignored, and -P would
still deliver the last command used, it should have returned
/bin/echo... but "/bin/echo" is no longer readable
Shouldn't it return "null" or empty string?
i.e. I thought I could check for an executable by doing
a lookup with -P (not for builtins, obviously) for non
builtins, seems that's not safe? Shouldn't it be?
