Summary of modifying file permissions and User Group management in linux

Commands frequently used in linux to modify file permissions and User Group management summary are as follows. Modify the user of the hosts file to us... linux. modify the file permissions and frequently used commands in the user group management summary. Modify the group to gourp1chgrp gourp1 test.txt 2.chownmodified file owner. modify the user of test.txt file to user1chown user1 test.txt modify the user of test.txt and chown user1: group1 test.txt 3. chmod modify File attributes chmod 755 testchmod u + x testchmod u-x testchmod g + x test 4. usrmod: modify the user group. Generally, you only need to add the current user to another group to usrmod-a-G group1 user1. if you want to completely change the group to which the user belongs, use usrmod-g group1 user1.