$ ls
bsondump.exe* mongodump.exe* mongoperf.exe* mongotop.exe*
libeay32.dll* mongoexport.exe* mongorestore.exe* ssleay32.dll*
mongo.exe* mongofiles.exe* mongos.exe*
mongod.exe* mongoimport.exe* mongos.pdb
mongod.pdb mongooplog.exe* mongostat.exe*
zongyuan.li@lizongyuan-pc MINGW64 /e/mongodb/bin
$ mongo
bash: mongo: command not found
zongyuan.li@lizongyuan-pc MINGW64 /e/mongodb/bin
$ mongo.exe
bash: mongo.exe: command not found
zongyuan.li@lizongyuan-pc MINGW64 /e/mongodb/bin
请问这是为什么?