当我做
which pip3
我得到
/usr/local/bin/pip3
但是当我尝试执行时pip3，出现如下错误：
bash: /usr/bin/pip3: No such file or directory
这是因为我最近删除了该文件。现在which命令指向的另一个版本pip3是位于/usr/local/bin但外壳还记得在错误的道路。我如何让它忘记那条路？
该which手册说
which returns the pathnames of the files (or links) which would be executed in the current environment, had its arguments been given as commands in
a strictly POSIX-conformant shell. It does this by searching the PATH for executable files matching the names of the arguments. It does not follow
symbolic links.
双方/usr/local/bin并/usr/bin …