Linux code

Chapter $7$: User and Group Accounts

Create user with primary and secondary groups, create groups,

modify user password parameter.

Create user who can login without a password.

Create a new user with specific file in their home directory using

$/$etc$/$new$\_$skel or $/$etc$/$skel$.$

Understand how to use the following:

$/$etc$/$passwd$,/$etc$/$shadow

$/$etc$/$skel

$.$bash$\_$profile, $.$bashrc

useradd, passwd, gpasswd

$/$etc$/$login$.$defs

chage, usermod, userdel

$/$etc$/$group

groupadd, groupmod, newgrp, groupdel

Chapter $8$: Scheduling Jobs

Create user and system cron. Understand the difference between

the two. Understand how to configure the minutes, hour, day of

month, month, day. Understand the difference between user cron

and system cron. Understand the following commands:

crontab $-$e$,$ crontab $-$l$,$ crontab $-$r

service crond status

$/$etc$/$crontab or $/$etc$/$cron$.$d

understand crontab entries: $3004111/$usr$/$bin$/$date

$/$etc$/$cron$.$alloweny

batch, $/$etc$/$cron$.$deny

$/$etc$/$anacrontab and anacrontab entries

nnacron $-$n

service atd status

at now $+1$ min

atq

$/$etc$/$at$.$allow $,/$etc$/$at$.$deny

batch

Chapter $9$ Localization

Understand how to configure the hardware clock and the system

clock. Understand how to configure the TZ variable temporarily

and permanently. Understand how to configure locale time zone

using the symbolic link. Understand the following commands:

locale, locale $-$a

LANG$=$

~$/.$bashrc or ~$/.$bash$\_$profile

export LANG$=$en$\_$US$.$utf$8$

iconv $-$l

$/$etc$/$localtime

$/$usr$/$share$/$zoneinfo

tzselect

export TZ$=$America$/$Chicago$$

date

date $-$s

date MMDDhhmmYYYY$.$ss

ln $-$sf