Questions tagged [passwd]
213 questions
63
votes
2 answers
Difference between ! vs !! vs * in /etc/shadow
The second field in the Linux /etc/shadow file represents a password. However, what we have seen is that:
Some of the password fields may have a single exclamation
:!:.....
Some of the password fields may have a double exclamation…
JavaTec
- 797
- 2
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42
votes
3 answers
Why is the password I entered not visible?
Below is the process I took to create a user on bash in Linux.
$ sudo useradd Alexandra
$ sudo passwd Alexandra
Enter new UNIX password:
Enter new UNIX password:
passwd: password updated successfully
I understand that the password shouldn't be…
Kaiylar
- 617
- 1
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37
votes
3 answers
When did Unix stop storing passwords in clear text?
When did Unix move away from storing clear text passwords in passwd? Also, when was the shadow file introduced?
ZDOSA
- 487
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37
votes
4 answers
May I sort the /etc/group and /etc/passwd files?
My /etc/group has grown by adding new users as well as installing programs that have added their own user and/or group. The same is true for /etc/passwd. Editing has now become a little cumbersome due to the lack of structure.
May I sort these…
Ned64
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31
votes
2 answers
What is the bin user for?
As I wrote at https://unix.stackexchange.com/a/484626/5132 this is worthy of its own Q&A.
On Linux operating systems … % getent passwd bin
bin:x:2:2:bin:/bin:/usr/sbin/nologin
% … and on FreeBSD … % getent passwd bin
bin:*:3:7:Binaries Commands and…
JdeBP
- 66,967
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- 159
- 343
29
votes
1 answer
Why would /etc/passwd be used every time someone executes `ls -l` command?
Read from APUE, just feel curious:
The password file is used every time a user logs in to a
UNIX system and every time someone executes an ls -l command.
Rick
- 1,107
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- 29
24
votes
1 answer
How to find the hashing algorithm used to hash passwords?
I have the working password and can see the hash (/etc/passwd). How do I find the hashing algorithm used to hash the password, without manually trying different algorithms until I find a match?
Dorin Botan
- 365
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- 9
24
votes
2 answers
Using "su - " to change user gives "No passwd entry for user"
Specifically, I am trying test something on my build server by switching to the "jenkins" user:
sudo su - jenkins
No passwd entry for user 'jenkins'
kevlarjacket
- 407
- 1
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- 12
20
votes
1 answer
Why does Debian set the login shell of user sync to /bin/sync?
sync is one of the user account created by Debian itself. I'm wondering why Debian sets its login shell to /bin/sync instead of /bin/false. How does Debian use this user account?
Cyker
- 4,174
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18
votes
3 answers
Lost password for a user on a Linux Server: How reset it?
On a Server an user 16040 has lost his password. I have password for root but don't have password for user 16040. How can I reset his password?
With passwd 16040, unix ask me current password that I don't have. Is there a command for reset a user's…
Catanzaro
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- 3
17
votes
1 answer
running git or ssh client in docker as user: No user exists for uid
Problem:
I'm trying to run a git clone myuser@server:repo.git from within a docker container. Inside the container (due to policy) I am the same user as on the docker host system (non-root) and have my home mounted.
Sadly when cloning from or trying…
Jörn Hees
- 271
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15
votes
2 answers
How could I eliminate Kerberos for passwd?
When I issue a command to change my password like this:
sudo passwd huahsin
The system prompt me:
Current Kerberos password:
I don't know what I have done to the system configuration, how could I eliminate this Kerberos thing when I change my…
huahsin68
- 1,847
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12
votes
4 answers
Will there be always a pair of same UID and GID?
I have to change a file/directory's ownership using chmod. I know only the owner's username but want to change the default group name simultaneously. At this stage the group name is not decided so I am putting same as the username:
chown -R…
Akaks
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12
votes
4 answers
"no such user" but user is in passwd file
Looking at the files in /etc/:
/etc/group:lbutler:*:1005:
/etc/master.passwd:lbutler:$6$s..../:1005:1005::0:0:L Butler:/home/lbutler:/bin/bash
/etc/passwd:lbutler:*:1005:1005:L Butler:/home/lbutler:/bin/bash
But:
$ passwd lbutler
passwd: lbutler:…
lbutlr
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12
votes
2 answers
Deleting a samba user: pbdedit vs. smbpasswd, what's the difference?
What is the difference between
$ pdbedit -x
and
$ smbpasswd -x
to delete samba users?
nieg
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