UNIX for Dummies Questions & Answers

Hi whenever i execute ls -ltr i get following entry.
But there is no such user as 501 .What is the issue.

Code:

#ls -ltr
drwxrwxrwx  2  501  501      3896 Aug 19 10:46 File1

Code:

# cat /etc/passwd | grep 501

The problem is this folder is mouted on client machine using nfs.But after mouting client machine get hang when i run df -h.

This was created by a user that has need removed, or UID# was changed.

We have not deleted any user.
This might be because it was mounted on client machine and somebody on client machinee has created that file.But problem of hanging still occur on client end. Please help.

What is your issue then?
Ikon gave you some explanation on what/why you see 501:501 rather than UID-name:GID-name but that doesnt seem to satisfy you..

The file apparently is located on a filesystem mounted on remote machine. The user on remote machine that has UID 501 isn't present on your machine, therefore when "ls" formats the output, it has nothing to put in the username field, as apparently there's no corresponding user entry in /etc/passwd.

There are few ways of handling the situation, depending on many factors. The simplest way is to create user on your machine with the same UID 501 and the same username as on remote filesystem hosting machine, just for a sake of consistency. If you have just few machines, it will work for you. In a case you have more than 3 boxes, I advice to setup NIS and establish central repository of users, which would replicate all of your records to the participating machines.

You may consider Evi Nemeth's book, or "Learn Linux" DVDs training by UnixAcademy.com if you have questions like that.