[PYTHON] When I try to run the pip command after updating pip, I get "No such file or directory"

Problem Unable to use pip command after "sudo pip install --upgrade pip"

After updating pip with sudo pip install --upgrade pip, I tried various pip commands, but it said bash: / usr / bin / pip: No such file or directory.

Solution hash -r

Running hash -r in the terminal fixed it.

Your own interpretation

According to the Reference Site

When the shell executes a command that is not a built-in command, it is necessary to search the environment variable PATH for the corresponding executable file, but frequently used commands are stored in a place called "hash table". "Hash" is a command to display, delete, and add this hash table.

In short, ** OS remembers "non-built-in, frequently used commands" in a hash table **. In other words

1. When you installed pip, the previous version of pip was uninstalled
2. However, the hash table still remembers the PASS of the previous version of pip.
3. Even if I execute the pip command in the terminal, the OS looks at the hash table and looks for the previous version of pip.
4. The previous version of pip was uninstalled and cannot be found

Is it like that?

What happens next?

According to the Reference Site

hash -r clears the path information stored in the hash table

It seems. This seems to erase even the memories that you do not want to delete other than the information of the previous version. Therefore,

hash -d command name deletes the memory corresponding to the command name.

Also,

If you execute only hash, the path name stored in the hash table and the number of times the command was executed in that path will be displayed.

Next time, I will check the hash table with hash and delete only unnecessary memories with hash -d command name.