Linux Basic article -19,w who whoami last Lastb lastlog basename

W who whoami last Lastb lastlog basename sleep hostname mail

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W.H.O.

WhoAmI

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

Lastb:/var/log/btmp file that displays user error attempts to log on

Lastlog: Users who have never logged in

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BaseName

$: Script path and name when executing script

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Sleep???

Example: every 5 seconds, log root is logged in, such as log in, show that it is logged in, and exit

Sleep 5 who | grep root

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Hostname??

If the host name is not James, change it to James.

If the current host name is localhost, change it to James

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Generate random numbers

random:0-32768

Random number generator

/dev/random

/dev/urandom

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Mail

[Email protected] ~]# Cat/etc/sysconfig/network-scripts/ifcfg-eth0 | Mail-s "How is you?" root

[[Email protected] ~]# mail

Heirloom Mail Version 12.4 7/29/08. Type? For help.

"/var/spool/mail/root": 3 messages

> 1 [email protected] Wed Jul 04:02 83/4061 "[ABRT] full crash rep"

2 root Wed Nov 10:14 19/630 "How is it?"

3 root Wed Nov 10:33 34/913 "How is it?"

&

[Email protected] ~]# Cat/etc/sysconfig/network-scripts/ifcfg-eth0 | Mail-s "How is you?" root

This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1877468

Linux Basic article -19,w who whoami last Lastb lastlog basename