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POpath cache of bash command
 

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    <p>The python script can't been found after uninstalled the old version with ports:</p> <pre><code> sudo port uninstall --follow-dependents python27 </code></pre> <p>But the python2.7 file is in the system path:</p> <pre><code>➜ ~ $ which python2.7 /usr/bin/python2.7 ➜ ~ $ python2.7 -V -bash: /opt/local/bin/python2.7: No such file or directory ➜ ~ $ ll /opt/local/bin/python* ls: /opt/local/bin/python*: No such file or directory ➜ ~ $ ll /usr/bin/python* -rwxr-xr-x 2 root wheel 57K 10 12 21:47 /usr/bin/python -rwxr-xr-x 5 root wheel 925B 10 12 21:47 /usr/bin/python-config lrwxr-xr-x 1 root wheel 75B 10 12 21:47 /usr/bin/python2.5 -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5 lrwxr-xr-x 1 root wheel 82B 10 12 21:47 /usr/bin/python2.5-config -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.5/bin/python2.5-config lrwxr-xr-x 1 root wheel 75B 10 12 21:47 /usr/bin/python2.6 -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.6/bin/python2.6 lrwxr-xr-x 1 root wheel 82B 10 12 21:47 /usr/bin/python2.6-config -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.6/bin/python2.6-config lrwxr-xr-x 1 root wheel 70B 10 13 20:38 /usr/bin/python2.7 -&gt; /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 lrwxr-xr-x 1 root wheel 82B 10 12 21:47 /usr/bin/python2.7-config -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7-config -rwxr-xr-x 2 root wheel 57K 10 12 21:47 /usr/bin/pythonw lrwxr-xr-x 1 root wheel 76B 10 12 21:47 /usr/bin/pythonw2.5 -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.5/bin/pythonw2.5 lrwxr-xr-x 1 root wheel 76B 10 12 21:47 /usr/bin/pythonw2.6 -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.6/bin/pythonw2.6 lrwxr-xr-x 1 root wheel 76B 10 12 21:47 /usr/bin/pythonw2.7 -&gt; ../../System/Library/Frameworks/Python.framework/Versions/2.7/bin/pythonw2.7 ➜ ~ $ /usr/bin/python2.7 -V Python 2.7.5 ➜ ~ $ ll /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 -rwxr-xr-x 1 root wheel 34K 10 12 21:47 /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 </code></pre> <p>The PATH value is:</p> <pre><code>➜ ~ $ echo $PATH|tr ':' '\n' /Users/adyliu/.rvm/gems/ruby-2.0.0-p247/bin /Users/adyliu/.rvm/gems/ruby-2.0.0-p247@global/bin /Users/adyliu/.rvm/rubies/ruby-2.0.0-p247/bin /Users/adyliu/.rvm/bin /opt/local/bin /opt/local/sbin /usr/bin /bin /usr/sbin /sbin /usr/local/bin /Users/adyliu/bin </code></pre> <p>I installed python2.7.3 using ports before, so the path of '/opt/local/bin' is before the path of '/usr/bin', and the python script(python2.7) was in '/opt/local/bin' before I uninstalled this python.</p> <p>Now my question is why the python script can not been found though the file is in the system path.</p> <pre><code>➜ ~ $ for d in `echo $PATH|tr ':' ' '`;do if [ -x $d/python2.7 ]; then ls -lh $d/python2.7;fi;done lrwxr-xr-x 1 root wheel 70B 10 13 20:38 /usr/bin/python2.7 -&gt; /System/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7 ➜ ~ $ which python2.7 /usr/bin/python2.7 ➜ ~ $ python2.7 -V -bash: /opt/local/bin/python2.7: No such file or directory </code></pre> <p>How to remove the hash cache of a command:</p> <pre><code>➜ ~ $ command -V python2.7 python2.7 is hashed (/opt/local/bin/python2.7) ➜ ~ $ type python2.7 python2.7 is hashed (/usr/bin/python2.7) ➜ ~ $ type python python is hashed (/usr/bin/python) </code></pre> <hr> <p><strong>Update 1</strong>:</p> <p>I DO NOT know why the 'python2.7' can been found currectly NOW (10 minites after the question was posted).</p> <pre><code>➜ ~ $ command -V python2.7 python2.7 is hashed (/usr/bin/python2.7) </code></pre> <hr> <p><strong>Update 2</strong>:</p> <p>The 'python2' script still can not been found:</p> <pre><code>➜ ~ $ python2 -V -bash: /opt/local/bin/python2: No such file or directory ➜ ~ $ python2 -bash: /opt/local/bin/python2: No such file or directory ➜ ~ $ which python2 /usr/bin/python2 ➜ ~ $ command -V python2 python2 is hashed (/opt/local/bin/python2) ➜ ~ $ python2 -V -bash: /opt/local/bin/python2: No such file or directory ➜ ~ $ /usr/bin/python2 -V Python 2.7.5 ➜ ~ $ ll /usr/bin/python2 lrwxr-xr-x 1 root wheel 18B 10 13 20:50 /usr/bin/python2 -&gt; /usr/bin/python2.7 ➜ ~ $ python2.7 -V Python 2.7.5 ➜ ~ $ python2 -V -bash: /opt/local/bin/python2: No such file or directory </code></pre>
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    1. COI find a question like this: http://unix.stackexchange.com/questions/5609/how-do-i-clear-bashs-cache-of-paths-to-executables
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