am trying to delete a user named vivek using the userdel command as follows
userdel -r vivek
userdel: user vivek is currently used by process 749
How do I fix this problem and delete username vivek on a Debian Linux 9.x server?
y Linux shell user can modify their password using the passwd command. How can I force users to choose the secure password that will prevent users from using stupid passwords like “abc123”, “password”, “123456” and so on? How do I setup password quality requirements on my Debian or Ubuntu Linux server?
ow do I change my own password as well as the passwords of other users as required under Linux operating system without using GUI systems? How can I change or set user password on Linux operating systems?
How do I rename a user name from ‘tom’ to ‘jerry’ under Ubuntu Linux?
The default algorithm for storing password hashes in /etc/shadow is MD5. I was told to use SHA-512 hashing algorithm. How do I set password hashing using the SHA-256 and SHA-512 under CentOS or Redhat Enterprise Linux 5.4?
How do I add a user to a group under Sun Solaris UNIX operating system from a shell prompt or command line?
Can you explain /etc/shadow file format used under Linux or UNIX-like system?