mysql privileges

How to grant privileges to mysql database.
1) log as root.
2) database name = vas_caht
    username = user
    password = password
    host = all host
mysql> grant all privileges on vas_chat.* to 'user'@'%' identified by 'password';

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Convert ^M to newline character in text files

If the ^M character is showing up in files while opening the file concerned, then follow these steps to convert it to a new line.
In vi use the following:

^M is ASCII 13 (Ctrl M), which is the carriage return.

Different operating systems use different symbols to set the end of a line/new line.
Unix uses newline (\n)
Mac uses carriage return (\r)
And Windows/DOS use both (\n\r)

To prevent the ^M from showing up in files, be sure to use the ASCII (text) mode when transfering text files.

Use this command : dos2unix <file name>

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How to find the disk usage in linux.
For linux, df -h is better. It writes it in “easy” viewable for humans.

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How queues are working..
Object a, b, c, d;
Queue q;
q.enter(a); //Object a enters the queue. q->a
q.enter(b); //Object b enters the queue. q->a->b
q.enter(c); //Object c enters the queue. q->a->b->c
Object x = q.exit(); //a exits the queue into x. q->b->c
q.enter(d); //Object d enters the queue q->b->c->d
Object y = q.exit(); //b exits the queue into y. q->c->d