將原先的bash_profile中的PATH環境變量中的$PATH刪除了，然后執行source ~/.bash_profile之后就出現了錯誤，每次打開Terminal都顯示：-bash: grep: command not found-bash: grep: command not foundenv: bash: No such file or directoryenv: bash: No such file or directoryenv: bash: No such file or directoryenv: bash: No such file or directoryenv: bash: No such file or directory-bash: grep: command not found-bash: cat: command not found-bash: grep: command not found-bash: grep: command not found-bash: grep: command not found-bash: grep: command not found所有的命令都不能正常執行了，類似：top、ifconfig都會顯示：-bash: top: command not found