The projection password used to turn off the user
pwunconv command is the opposite of the pwconv function and is used to turn off the user's projected password. It will save the password from the shadow file back to the passwd file.
pwunconv
pwunconv # Turn off shadow password
cat /etc/passwd | grep test # Found that the password is already in the passwd file
test:$6$nYOEWamm$bz07nlv/.RgJufb3FAqJJeULfwybzgxmrWqbk7O4vI0KsT6N.ujrh6dDIUcAJdfjksyuyAFDPIngZeD3cgcf.0:3001:3001::/home/test:/bin/sh
ls /etc/shadow # View the shadow file, prompting that there is no such file or directory
ls: cannot access /etc/shadow: No such file or directory