錯誤：command not found

出現錯誤：
Command 'ls' is available in '/bin/ls'
The command could not be located because '/bin' is not included in the PATH environment variable.
ls: command not found
原因是設置環境變量的時候寫錯了~
在設置的時候沒有包含原路徑

顯示環境變量：
echo $PATH

裏面沒有/bin/

把它添加進去就就好了~~