hi ,
as i mentioned in title i delete '/usr/bin/passwd' by accident on my CentOS Linux release 7.2.1511 (Core).. please help, the easy way i see is if anyone have the same Centos 7 uploads the /usr/bin/passwd.
thanks

Oops, totally misread this as "etc/passwd", my bad...

Put in your installation media, and copy it from there. The /usr/bin/passwd program is a binary, and since you have the installation media (or can easily make one), you can just copy that program back.

/usr/bin/passwd is part of the "passwd" RPM. You could just reinstall that package:

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You need to be root to perform this command... i don't have root account on the server

Then how did you delete /usr/bin/passwd? A standard user does not have permissions to delete a binary in that directory.

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As sevendogsbsd pointed out, you couldn't have done what you say you did, without root (or sudo/root-level) access. And even past that, you can simply power the system off, and boot in single-user mode (which IS root-enabled), mount the hard drive and install media manually, and copy the file.

Or copy the file using sudo.

That's probably what happened to OP, too.

But how, without superuser privileges?

i have the permission to copy or move or delete /usr/bin/passwd without root or sudo... maybe a misconfiguration behind that

misconfiguration.. maybe!!

as i say i don't have physical access to the server it's in on the other side of the earth.. thanks for the response

Definitely a misconfiguration. So can you copy INTO /usr/bin? If you can, SSH into the server and mount installation medium locally, then copy the file from your local machine out to the server into /usr/bin with rsync or some other remote command.

After you get the system working, you need to reconfigure so you can use sudo.

additionally you can download the mentioned rpm, unpack it and use the binary from that package.

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Probably could also SSH into the remote machine and use wget to download the rpm and install from there, if you have internet access - many ways to do this.

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To do this on CentOS:
1) Make yourself a subdirectory for the download and extract that follows:
2) Change to the new subdirectory:
3) Download the RPM:
4) Above should put a file like passwd-0.79-4.el7.x86_64.rpm in the directory. RPMs can be converted to cpio backup format (similar to tar format) with the rpm2cpio command. That cpio output can be extracted with the cpio command so the following pipeline does the conversion to cpio and the extract of the files the RPM contained:
5) That will install the files in subdirectories of the one you created so your new passwd subdirectroy will contain ./usr/bin/passwd (the . is important). You can copy that into the real /usr/bin:
Note:
You may need to prepend the "cp" with "sudo" or some other command as regular users don't have permission to write into /usr/bin but you seem to indicate you do.

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