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@C67-X64-A0 ~]# cp -a /etc/skel/ /home/tuser1 [root@C67-X64-A0 ~]# ls -ld /home/tuser drwxr-xr-x. 4 root root 4096 7月 6 00:29 /home/tuser [root@C67-X64-A0 ~]# ls -ld /home/tuser1 drwxr-xr-x. 4 root root 4096 7月 6 00:29 /home/tuser1 [root@C67-X64-A0 ~]# chmod 700 -R /home/tuser1 [root@C67-X64-A0 ~]# ll -ld !$ ll -ld /home/tuser1 drwx------. 4 root root 4096 7月 6 00:29 /home/tuser1
2、编辑/etc/group文件,添加组hadoop。
[root@C67-X64-A0 ~]# echo "hadoop:x:1000:">>/home/group [root@C67-X64-A0 ~]# cat /home/group | grep hadoop hadoop:x:1000:
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@C67-X64-A0 ~]# mkdir -p /home/hadoop [root@C67-X64-A0 ~]# echo "hadoop:x:1000:1000::/home/hadoop:/bin/bash">>/etc/passwd [root@C67-X64-A0 ~]# id hadoop uid=1000(hadoop) gid=1000 组=1000 [root@C67-X64-A0 ~]# chown hadoop:hadoop /home/hadoop/
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@C67-X64-A0 ~]# cp -a /etc/skel/ /home/hadoop [root@C67-X64-A0 ~]# chmod -R 700 /home/hadoop/ [root@C67-X64-A0 ~]# ls -ld !$ ls -ld /home/hadoop/ drwx------ 3 hadoop hadoop 4096 7月 28 01:43 /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@C67-X64-A0 ~]# chown -R hadoop:hadoop /home/hadoop/ [root@C67-X64-A0 ~]# ls -ld !$ ls -ld /home/hadoop/ drwx------ 3 hadoop hadoop 4096 7月 28 01:43 /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@C67-X64-A0 ~]# grep -i ^s /proc/meminfo --color=auto SwapCached: 0 kB SwapTotal: 4194300 kB SwapFree: 4194300 kB Shmem: 1480 kB Slab: 177376 kB SReclaimable: 133836 kB SUnreclaim: 43540 kB [root@C67-X64-A0 ~]# grep ^[Ss] /proc/meminfo --color=auto SwapCached: 0 kB SwapTotal: 4194300 kB SwapFree: 4194300 kB Shmem: 1480 kB Slab: 177376 kB SReclaimable: 133840 kB SUnreclaim: 43536 kB
7、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户;
[root@C67-X64-A0 ~]# grep -v "/sbin/nologin" /etc/passwd|awk -F ":" '{print $1}' root sync shutdown halt amandabackup mysql wanlong hadoop
8、显示/etc/passwd文件中其默认shell为/bin/bash的用户;
[root@C67-X64-A0 ~]# grep "/bin/bash" /etc/passwd --color=auto | cut -d":" -f1 root amandabackup mysql wanlong hadoop [root@C67-X64-A0 ~]# grep "/bin/bash" /etc/passwd --color=auto | awk -F ":" '{print $1}' root amandabackup mysql wanlong hadoop
9、找出/etc/passwd文件中的一位数或两位数;
[root@C67-X64-A0 ~]# 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
10、显示/boot/grub/grub.conf中以至少一个空白字符开头的行;
[root@C67-X64-A0 ~]# grep "^[[:space:]]\+" /boot/grub/grub.conf root (hd0,0) kernel /tboot.gz logging=vga,serial,memory module /vmlinuz-2.6.32-573.el6.x86_64 ro root=UUID=922eb46f-7e6e-4670-8bf1-6f9f1b05a053 intel_iommu=on amd_iommu=on rd_NO_LUKS KEYBOARDTYPE=pc KEYTABLE=us rd_NO_MD crashkernel=128M.UTF-8 rd_NO_LVM rd_NO_DM rhgb quiet module /initramfs-2.6.32-573.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@C67-X64-A0 ~]# grep "^#[[:space:]]\+[^[:space:]]\+" /etc/rc.d/rc.sysinit # /etc/rc.d/rc.sysinit - run once at boot time # Taken in part from Miquel van Smoorenburg's bcheckrc. # Check SELinux status # Print a text banner. # Only read this once. # Initialize hardware # Set default affinity # Load other user-defined modules # Load modules (for backward compatibility with VARs) # Configure kernel parameters # Set the hostname. # Sync waiting for storage. # Device mapper & related initialization # Start any MD RAID arrays that haven't been started yet # Remount the root filesystem read-write. # Clean up SELinux labels # If relabeling, relabel mount points. # Mount all other filesystems (except for NFS and /proc, which is already # mounted). Contrary to standard usage, # filesystems are NOT unmounted in single user mode. # The 'no' applies to all listed filesystem types. See mount(8). # Update quotas if necessary # Check to see if a full relabel is needed # Initialize pseudo-random number generator # Configure machine if necessary. # Clean out /. # Do we need (w|u)tmpx files? We don't set them up, but the sysadmin might... # Clean up /var. # Clean up utmp/wtmp # Clean up various /tmp bits # Make ICE directory # Start up swapping. # Set up binfmt_misc # Boot time profiles. Yes, this should be somewhere else. # Now that we have all of our basic modules loaded and the kernel going, # let's dump the syslog ring somewhere so we can find it later # create the crash indicator flag to warn on crashes, offer fsck with timeout # Let rhgb know that we're leaving 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@C67-X64-A0 ~]# netstat -tan|grep "LISTEN*[[:space:]]" tcp 0 0 0.0.0.0:56495 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 :::60107 :::* LISTEN tcp 0 0 :::111 :::* 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@C67-X64-A0 ~]# adduser bash [root@C67-X64-A0 ~]# adduser testbash [root@C67-X64-A0 ~]# adduser basher [root@C67-X64-A0 ~]# adduser nologin -s /sbin/nologin [root@C67-X64-A0 ~]# 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:1001:1001::/home/bash:/bin/bash nologin:x:1004:1004::/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;
前面题目里面已经用了两种grep的方法:
[root@C67-X64-A0 ~]# sed -n '/^[Ss]/p' /proc/meminfo SwapCached: 0 kB SwapTotal: 4194300 kB SwapFree: 4194300 kB Shmem: 1480 kB Slab: 177580 kB SReclaimable: 133984 kB SUnreclaim: 43596 kB
15、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户;
[root@C67-X64-A0 ~]# grep -v '/sbin/nologin' /etc/passwd|cut -d":" -f1 root sync shutdown halt amandabackup mysql wanlong hadoop bash testbash basher [root@C67-X64-A0 ~]# grep -v '/sbin/nologin' /etc/passwd|awk -F ":" '{print $1}' root sync shutdown halt amandabackup mysql wanlong hadoop bash testbash basher
16、显示/etc/passwd文件中其默认shell为/bin/bash的用户;
[root@C67-X64-A0 ~]# grep '/bin/bash' /etc/passwd|cut -d":" -f1 root amandabackup mysql wanlong hadoop bash testbash basher [root@C67-X64-A0 ~]# grep '/bin/bash' /etc/passwd|awk -F ":" '{print $1}' root amandabackup mysql wanlong hadoop bash testbash basher
17、找出/etc/passwd文件中的一位数或两位数;
[root@C67-X64-A0 ~]# 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 10 0 13 30 14 50 99 99 81 81 18 9 18 9
原创文章,作者:Net21-冰冻vs西瓜,如若转载,请注明出处:http://www.178linux.com/26449
评论列表(2条)
写的很好,排版也很棒,加油
你这个排版是如何做到的?