Linux terminal type, Who,last

W

W.H.O.

WhoAmI

Last: Displays the/var/log/wtmp file showing the user login history and the system restart history

-N: Displays information about the last n times

lastb:/var/log/btmp file, displaying user error login attempt history

-N:

Lastlog: Displays the last successful logon information for each user

-U USERNAME: Displays recent login information for a specific user

BaseName $: Name does not show path

Mail: Send Email

Hostname: Display host name

Generating random numbers in random:0-32768

Random number generator: Entropy pool

/dev/random More secure

/dev/urandom more useful

For example: Write a script that generates 10 random numbers using random and finds the maximum and minimum values

#!/bin/bash

Max=0

Min=0

For ((i=1;i<=10;i++))

Do

Myrand= $RANDOM

If [$i-eq 1]

Then

min= $RANDOM

Fi

If [$i-le 9]

Then

Echo-n "$myrand,"

Else

Echo $myrand

Fi

If [$myrand-gt $MAX]

Then

max= $myrand

Fi

If [$myrand-lt $MIN]

Then

min= $myrand

Fi

Done

echo "The max number is $MAX"

echo "The min number is $MIN"

Terminal type

Console: Consoles

Pty: Physical Terminal (VGA)

TTY: Virtual terminal (VGA)

TTYs: Serial Terminal

pts/#: Pseudo Terminal

This article is from the "ngames" blog, make sure to keep this source http://ngames.blog.51cto.com/3187187/1546532

Linux terminal type, Who,last