在linux服务器上，升级了pip，升级成功后出现/usr/bin/pip: No such file or directory
1.which pip
/usr/bin/pip
2.pip
-su: /usr/bin/pip: No such file or directory
3.type pip
pip is hashed (/usr/bin/pip)
So pip is definintely in /usr/local/bin/pip but it is been cached as in /usr/bin/pip, thanks to the Stackoverflow question, the solution is very simple:
4.hash -r
When the cache is clear, pip is working again.
pip在usr/bin/pip
如果机器上已经有之前的pip，要先卸载
sudo apt-get remove python-pip
wget https://bootstrap.pypa.io/get-pip.py
python get-pip.py
hash -r
