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Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readabl
From: |
Linda Walsh |
Subject: |
Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable) |
Date: |
Thu, 31 Jul 2014 23:40:18 -0700 |
User-agent: |
Thunderbird |
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?
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable),
Linda Walsh <=
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Mike Frysinger, 2014/08/01
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Greg Wooledge, 2014/08/01
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Linda Walsh, 2014/08/01
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Chet Ramey, 2014/08/04
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Linda Walsh, 2014/08/04
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Chet Ramey, 2014/08/04
- Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Linda Walsh, 2014/08/05
Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Linda Walsh, 2014/08/01
Re: bug? "type -P xxx" returns "xxx" that isn't executable...(or readable), Chet Ramey, 2014/08/01