Shell not picking correct path to run drush - sh

Question

I've got drush in /usr/local/bin. Running which drush returns /usr/local/bin/drush. However running drush displays "-bash: /usr/bin/drush: No such file or directory". Running /usr/local/bin/drush works correctly.
My $PATH is /usr/local/bin:/usr/local/mysql/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/X11/bin
[added in an edit] Before I had this issue I removed a copy of the script that was at /usr/bin/drush. It wasn't built correctly.
What on earth could be causing this problem? I do not want to have to type out /usr/local/bin/drush every time; that's why /usr/local/bin is in my $PATH.

Answer 1

Have you run drush before in this shell, then moved it from /usr/bin to /usr/local/bin ? If so, the hash command will show that the shell has remembered the command in the /usr/bin location and will presume it's there without re-checking. Run hash -r will clear this list.
Worked example:
$ echo >/usr/bin/hello 'echo hello'
$ chmod +x /usr/bin/hello
$ hash
hits command
1 /bin/chmod
$ hello
hello
$ hash
hits command
1 /bin/chmod
1 /usr/bin/hello
$ which hello
/usr/bin/hello
$ mv /usr/bin/hello /usr/local/bin/
$ hello
bash: /usr/bin/hello: No such file or directory
$ hash
hits command
1 /usr/bin/which
1 /bin/chmod
1 /bin/mv
2 /usr/bin/hello
$ which hello
/usr/local/bin/hello
$ hash -r
$ hash
hash: hash table empty
$ hello
hello
$ hash
hits command
1 /usr/local/bin/hello