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Dear

You can grep the output of ls by using following command

ls -ltr | grep rahul

In above command you are listing all the things in current directory but greping rahul in that directory...

Dear Friend

If you are facing the above problem just go into the single user mode & then modify the shadow file where the encrepted password for the root is placed then give passwd command &...

In the following examples, first the preferred and then the obsolete way of specifying sort keys are given as an aid to understanding the relationship between the two forms.

Example 1 Sorting with...

You can continue with the existing setup. I am sure it will work.