linux 修改文件、文件夹权限
# change owner of all the fies under dirName
chown -R username dirName
#change owner and the file group of all the files under dirName
chown -R username:groupName dirName
# change owner of all the fies under dirName
chown -R username dirName
#change owner and the file group of all the files under dirName
chown -R username:groupName dirName