1、复制/etc/skel目录为/home/tuser1，要求/home/tuser1及其内部文件的属组和其它用户均没有任何访问权限
[root@localhost ~]# cp -a /etc/skel /home/tuser1
[root@localhost ~]# chmod -R go= /home/tuser1
[root@localhost ~]# ls -ld /home/tuser1/
drwx——. 2 root root 4096 Nov 30 17:47 /home/tuser1/
[root@localhost ~]# cp -r /etc/skel /home/tuser1
[root@localhost ~]# chmod -R 700 /home/tuser1/
[root@localhost ~]# ls -ld /home/tuser1/
drwx——. 3 root root 4096 Dec 24 19:19 /home/tuser1/
2、编辑/etc/group文件，添加组hadoop
[root@localhost ~]# vi /etc/group
[root@localhost ~]# tail -1 /etc/group
hadoop:x:557
[root@localhost ~]# echo “hadoop:x:557” >> /etc/group && tail -1 /etc/group
hadoop:x:557
3、手动编辑/etc/passwd文件新增一行，添加用户hadoop，其基本组ID为hadoop组的id号；其家目录为/home/hadoop
[root@localhost ~]# vi /etc/passwd
[root@localhost ~]# tail -1 /etc/passwd
hadoop:x:1009:1009::/home/hadoop:/bin/bash
[root@localhost ~]# echo “hadoop:x:1009:1009::/home/hadoop:/bin/bash” >> /etc/passwd && tail -1 /etc/passwd
hadoop:x:1009:1009::/home/hadoop:/bin/bash
[root@localhost ~]# id hadoop
uid=1009(hadoop) gid=1009 groups=1009
4、复制/etc/skel目录为/home/hadoop，要求修改hadoop目录的属组和其它用户没有任何访问权限
[root@localhost ~]# cp -r /etc/skel /home/hadoop
[root@localhost ~]# chmod -R 700 /home/hadoop
[root@localhost ~]# ls -ld /home/hadoop
drwx—— 2 root root 4096 Dec 24 19:39 /home/hadoop
5、修改/home/hadoop目录及其内部所有文件的属主为hadoop，属组为hadoop
[root@localhost ~]# chown -R hadoop:hadoop /home/hadoop
[root@localhost ~]# ls -al /home/hadoop
total 20
drwx—— 2 hadoop hadoop 4096 Dec 24 19:39 .
drwxr-xr-x. 12 root root 4096 Dec 24 19:39 ..
-rwx—— 1 hadoop hadoop 18 Dec 24 19:39 .bash_logout
-rwx—— 1 hadoop hadoop 193 Dec 24 19:39 .bash_profile
-rwx—— 1 hadoop hadoop 231 Dec 24 19:39 .bashrc
6、显示/proc/meminfo文件中以大写或小写S开头的行；用两种方式
[root@localhost ~]# grep “^[sS]” /proc/meminfo
SwapCached: 0 kB
SwapTotal: 8388604 kB
SwapFree: 8388604 kB
Shmem: 6896 kB
Slab: 43572 kB
SReclaimable: 20876 kB
SUnreclaim: 22696 kB
[root@localhost ~]# grep -i “^s” /proc/meminfo
SwapCached: 0 kB
SwapTotal: 8388604 kB
SwapFree: 8388604 kB
Shmem: 6896 kB
Slab: 43572 kB
SReclaimable: 20876 kB
SUnreclaim: 22696 kB
[root@localhost ~]# grep -E “^(s|S)” /proc/meminfo
SwapCached: 0 kB
SwapTotal: 8388604 kB
SwapFree: 8388604 kB
Shmem: 6896 kB
Slab: 43572 kB
SReclaimable: 20876 kB
SUnreclaim: 22696 kB
7、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户
[root@localhost ~]# grep -v “/sbin/nologin$” /etc/passwd |cut -d: -f1
root
sync
shutdown
halt
gentpp
gentoo
fedora
mageia
slackware
gentnn
slack
centos
hadoop
[root@localhost ~]# grep -v “nologin\>$” /etc/passwd |cut -d: -f1
root
sync
shutdown
halt
gentpp
gentoo
fedora
mageia
slackware
gentnn
slack
centos
hadoop
8、显示/etc/passwd文件中其默认shell为/bin/bash的用户
[root@localhost ~]# grep “/bin/bash$” /etc/passwd | cut -d: -f1
root
gentoo
mageia
gentnn
centos
hadoop
[root@localhost ~]# grep “bash\>$” /etc/passwd | cut -d: -f1
root
gentoo
mageia
gentnn
centos
hadoop
9、找出/etc/passwd文件中的一位数或两位数
[root@localhost ~]# grep “\<[0-9]\{1,2\}\>” /etc/passwd
root:x:0:0:root:/root:/bin/bash
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
adm:x:3:4:adm:/var/adm:/sbin/nologin
lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin
nobody:x:99:99:Nobody:/:/sbin/nologin
dbus:x:81:81:System message bus:/:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
rpc:x:32:32:Rpcbind Daemon:/var/lib/rpcbind:/sbin/nologin
rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin
[root@localhost ~]# grep “\<[0-9]\{1,2\}\>” /etc/passwd | cut -d: -f3 | sort -n
0
1
2
3
4
5
6
7
8
11
12
14
29
32
74
81
89
99
10、显示/boot/grub/grub.conf中以至少一个空白字符开头的行
[root@localhost ~]# ls -ld /boot/grub
drwxr-xr-x. 2 root root 4096 Nov 30 17:49 /boot/grub
[root@localhost ~]# ls /boot/grub
splash.xpm.gz
[root@localhost ~]# ls /boot/grub2
device.map fonts grub.cfg grubenv i386-pc locale
[root@localhost ~]# grep “^[[:space:]]\+.*” /boot/grub2/grub.cfg | wc -l
64
[root@localhost ~]# grep “^[[:space:]]\+.*” /boot/grub/grub.conf
11、显示/etc/rc.d/rc.sysinit文件中以#开头，后面跟至少一个空白字符，而后又有至少一个非空白字符的行
[root@localhost ~]# grep “^#[[:space:]]\+[^[:space:]]\+” /etc/rc.d/rc.sysinit
12、打出netstat -tan命令执行结果中以‘LISTEN’，后或跟空白字符结尾的行
[root@localhost ~]# netstat -tan
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 192.168.43.191:22 192.168.43.233:50240 ESTABLISHED
tcp 0 52 192.168.43.191:22 192.168.43.233:51118 ESTABLISHED
tcp6 0 0 :::111 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 ::1:25 :::* LISTEN
[root@localhost ~]# netstat -tan | grep “LISTEN[[:space:]]*$”
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp6 0 0 :::111 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 ::1:25 :::* LISTEN
13、添加用户bash, testbash, basher, nologin (此一个用户的shell为/sbin/nologin)，而后找出当前系统上其用户名和默认shell相同的用户的信息
[root@localhost ~]# useradd bash
[root@localhost ~]# useradd testbash
[root@localhost ~]# useradd basher
[root@localhost ~]# useradd -s /sbin/nologin nologin
[root@localhost ~]# tail -4 /etc/passwd
bash:x:4006:4006::/home/bash:/bin/bash
testbash:x:4007:4007::/home/testbash:/bin/bash
basher:x:4008:4008::/home/basher:/bin/bash
nologin:x:4009:4009::/home/nologin:/sbin/nologin
[root@localhost ~]# grep -E “^([^:]+\>).*\1$” /etc/passwd
sync:x:5:0:sync:/sbin:/bin/sync
shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
halt:x:7:0:halt:/sbin:/sbin/halt
bash:x:4006:4006::/home/bash:/bin/bash
nologin:x:4009:4009::/home/nologin:/sbin/nologin
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评论列表（2条）
赞，前面几个题目使用了至少一种方法实现，比较好~~排版上也很清晰，继续加油~
内容上没什么问题，排版上可以变化一下~~加油哈~