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 -r /etc/skel /home/tuser1 [root@localhost /]# chmod -R 700 /home/tuser1 [root@localhost /]# ll -d /home/tuser1 drwx------. 4 root root 4096 Jul 21 23:13 /home/tuser1
2、编辑/etc/group文件,添加组hadoop;
[root@localhost /]# echo "hadoop:x:2019" >> /etc/group [root@localhost /]# cat /etc/group | tail -1 hadoop:x:2019
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 /]# echo "hadoop:x:$(grep "\bhadoop" /etc/group | cut -d: -f3)":$(grep "\bhadoop" /etc/group | cut -d: -f3)::/home/hadoop:/bin/bash >> /etc/passwd [root@localhost /]# cat /etc/passwd | tail -1 hadoop:x:2019:2019::/home/hadoop:/bin/bash
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 700 /home/hadoop [root@localhost /]# ll /home | grep 'hadoop' drwx------. 5 root root 4096 Jul 21 23:44 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 /]# ll -d /home/hadoop drwx------. 5 hadoop hadoop 4096 Jul 21 23:44 /home/hadoop
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 -i '^s' /proc/meminfo SwapCached: 0 kB SwapTotal: 2031612 kB SwapFree: 2031612 kB Shmem: 1268 kB Slab: 91000 kB SReclaimable: 28080 kB SUnreclaim: 62920 kB [root@localhost /]# grep '^[sS]' /proc/meminfo SwapCached: 0 kB SwapTotal: 2031612 kB SwapFree: 2031612 kB Shmem: 1268 kB Slab: 90968 kB SReclaimable: 28080 kB SUnreclaim: 62888 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 chenchen mageia slackware tuser1 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 chenchen mageia tuser1 hadoop
9、找出/etc/passwd文件中的一位数或两位数;
[root@localhost /]# egrep -o '[[:digit:]]{1,2}' /etc/passwd
10、显示/boot/grub/grub.conf中以至少一个空白字符开头的行;
[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;
netstat -tan | grep '\(LISTEN\)[[:space:]]\+$'
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 /]# grep '^\(\b[[:alnum:]]\+\b\).*\1$' /etc/passwd sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt bash:x:2020:2020::/home/bash:/bin/bash nologin:x:2023:2023::/home/nologin:/sbin/nologin
14、显示/proc/meminfo文件中以大写或小写S开头的行;用三种方式;
[root@localhost /]# grep -i '^s' /proc/meminfo SwapCached: 0 kB SwapTotal: 2031612 kB SwapFree: 2031612 kB Shmem: 1268 kB Slab: 91000 kB SReclaimable: 28080 kB SUnreclaim: 62920 kB [root@localhost /]# grep '^[sS]' /proc/meminfo SwapCached: 0 kB SwapTotal: 2031612 kB SwapFree: 2031612 kB Shmem: 1268 kB Slab: 90968 kB SReclaimable: 28080 kB SUnreclaim: 62888 kB [root@localhost /]# cat /proc/meminfo | grep -i '^s' SwapCached: 0 kB SwapTotal: 2031612 kB SwapFree: 2031612 kB Shmem: 1268 kB Slab: 91140 kB SReclaimable: 28188 kB SUnreclaim: 62952 kB
15、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户;
[root@localhost /]# grep -v '/sbin/nologin$' /etc/passwd root:x:0:0:root:/root:/bin/bash sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt chenchen:x:500:500:chenchen:/home/chenchen:/bin/bash mageia:x:1100:1100::/home/linux:/bin/bash slackware:x:2002:2016::/home/slackware:/bin/tcsh tuser1:x:2003:2003::/home/tuser1:/bin/bash hadoop:x:2019:2019::/home/hadoop:/bin/bash bash:x:2020:2020::/home/bash:/bin/bash testbash:x:2021:2021::/home/testbash:/bin/bash basher:x:2022:2022::/home/basher:/bin/bash
16、显示/etc/passwd文件中其默认shell为/bin/bash的用户;
[root@localhost /]# grep '/bin/bash$' /etc/passwd root:x:0:0:root:/root:/bin/bash chenchen:x:500:500:chenchen:/home/chenchen:/bin/bash mageia:x:1100:1100::/home/linux:/bin/bash tuser1:x:2003:2003::/home/tuser1:/bin/bash hadoop:x:2019:2019::/home/hadoop:/bin/bash bash:x:2020:2020::/home/bash:/bin/bash testbash:x:2021:2021::/home/testbash:/bin/bash basher:x:2022:2022::/home/basher:/bin/bash
17、找出/etc/passwd文件中的一位数或两位数;
[root@localhost /]# grep -o '[[:digit:]]\{1,2\}' /etc/passwd
原创文章,作者:N21-yoyo_chen,如若转载,请注明出处:http://www.178linux.com/25261
评论列表(1条)
写的很好,可以看的出来很用心,继续保持