标签:作业
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 go=-- /home/tuser1/ drwx------. 3 root root 4096 8月 28 02:25 /home/tuser1/
2、编辑/etc/group文件,添加组hadoop。
[root@localhost ~]#vim /etc/group hadoop:x:501:
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 ~]#vim /etc/passwd hadoop:x:501:501::/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 -a /etc/skel/ /home/hadoop [root@localhost ~]#chmod go=-- /home/hadoop/ drwx------. 3 root root 4096 8月 28 02:25 /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 drwx------. 3 hadoop hadoop 4096 8月 28 02:25 /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 ~]#cat /proc/meminfo | grep ^[Ss].* SwapCached: 0 kB SwapTotal: 2031612 kB SwapFree: 2031612 kB Shmem: 228 kB Slab: 72864 kB SReclaimable: 13656 kB SUnreclaim: 59208 kB [root@localhost ~]#cat /proc/meminfo | grep -i ^s.* SwapCached: 0 kB SwapTotal: 2031612 kB SwapFree: 2031612 kB Shmem: 228 kB Slab: 72880 kB SReclaimable: 13660 kB SUnreclaim: 59220 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 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 hadoop
9、找出/etc/passwd文件中的一位数或两位数;
[root@localhost ~]#grep -o ‘\<[0-9]\{1,2\}\>‘ /etc/passwd 0 0 1 1 2 2 3 4 4 7 5 0 6 0 7 0 8 12 10 14 11 0 12 13 30 14 50 99 99 81 81 32 32 69 69 29 29 68 68 38 38 76 89 89 74 74 72 72 16 16
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 root (hd0,0) kernel /vmlinuz-2.6.32-642.el6.x86_64 ro root=/dev/mapper/VolGroup-lv_root nomodeset rd_NO_LUKS rd_NO_MD rd_LVM_LV=VolGroup/lv_swap crashkernel=auto LANG=zh_CN.UTF-8 rd_LVM_LV=VolGroup/lv_root KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet initrd /initramfs-2.6.32-642.el6.x86_64.img
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.local # This script will be executed *after* all the other init scripts. # You can put your own initialization stuff in here if you don‘t # want to do the full Sys V style init stuff.
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 -lan | grep ‘LISTEN[[:space:]]\+$‘ tcp 0 0 0.0.0.0:33769 0.0.0.0:* LISTEN 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 0 127.0.0.1:631 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp 0 0 :::111 :::* LISTEN tcp 0 0 :::34801 :::* LISTEN tcp 0 0 :::22 :::* LISTEN tcp 0 0 ::1:631 :::* LISTEN tcp 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 && useradd testbash && useradd basher && useradd -s /sbin/nologin nologin bash:x:501:502::/home/bash:/bin/bash testbash:x:502:503::/home/testbash:/bin/bash basher:x:503:504::/home/basher:/bin/bash nologin:x:504:505::/home/nologin:/sbin/nologin [root@localhost ~]# grep ‘^\([[:alnum:]]\+\>\).*\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:501:502::/home/bash:/bin/bash nologin:x:504:505::/home/nologin:/sbin/nologin
标签:作业
原文地址:http://11884010.blog.51cto.com/11874010/1843350