The second operation of the new Linux+python high-end operation and Maintenance class

1. Who | Cut-d '-f1 | Sort-u

2.cut-d:-f7/etc/passwd | uniq-c | Sort-rn | Head-n-1

3.SORT-T:-k3-n/etc/passwd |tail-n-10 | Tr ' A-Z ' A-Z ' > Tmp/maxusers.txt

4.ifconfig | Head-n-2 | Tail-n-1 | Cut-d:-f2 | Tr-d "Bcast"

5.ls/var/|wc-w

6.SORT-T:-k3n/etc/group | Head-n-10 | Cut-d:-f1

7.cat/etc/fstab/etc/issue >/tmp/etc.test

8.groupadd-g Disto

Useradd-u 1005-g distro Mandriva

Useradd-u 1100-d/home/linux Mageia

echo "Mageedu" | passwd--stdin Mageia

Userdel Mandriva

Useradd-u 2002-g disrto-g Peguin Slackware

Usermod-s/bin/tcsh Slackware

Usermod-ag Admins Slackware

Passwd-n 3-x 183-w 3 Slackware

Useradd-u 3003-g clouds-g Peguin,nova OpenStack

Useradd-s/sbin/nologin Mysal

echo "passwd" | passwd stdin "OpenStack"

9.cp-r/etc/skel/home

Mv/home/skel/home/tuser1

chmod g-r,o-r/home/tuser1

Ll-a/home/tuser1 | grep tuser1

chmod g-r,o-r/home/tuwer1/.*

Ll-a/home/tuser1

10.cat/etc/passwd | grep-e ^ (s| S

cat/etc/passwd | Grep-e-I. ^s

cat/etc/passwd | GREP-E ^[ss]

cat/etc/passwd | Grep-e "^s"-E "^s"

11.cat/etc/passwd | Grep-e-V "/bin/nologin$"

cat/etc/passwd | Grep-e "/bin/nologin$"

cat/etc/passwd | grep "\<[0-9]\{2,3\}\>"

grep "^#[[:space:]]\+[^[:space:]"/etc/rc.d/rc.sysinit

15.netstat-tan | grep "listen[[:space:]]*$"

16.useradd Bash

Useradd Testbash

Useradd basher

Useradd-s/sbin/nologin Nologin

# egrep "^ ([[:alnum:]]+\>). *\1$"/etc/passwd

The second operation of the new Linux+python high-end operation and Maintenance class