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 ~]# cd /home/
[root@localhost home]# mkdir tuser1
[root@localhost home]# cp -a /etc/skel /home/tuser1
[root@localhost home]# chmod -R go-rwx /home/tuser1
2、 编辑/etc/group文件,添加组hadoop。
[root@localhost ~]# echo "hadoop:x:206:" >> /etc/group
[root@localhost ~]# tail -1f /etc/group
hadoop:x:206:
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::206:200::/home/hadoop:/bin/basename" >> /etc/passwd
[root@localhost ~]# tail -1 /etc/passwd
hadoop::206:200::/home/hadoop:/bin/basename
[root@localhost ~]#
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 go-rwx /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/
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: 2064380 kB
SwapFree: 2064380 kB
Shmem: 4052 kB
Slab: 66780 kB
SReclaimable: 30152 kB
SUnreclaim: 36628 kB
[root@localhost ~]# cat /proc/meminfo | grep ^[Ss].*
SwapCached: 0 kB
SwapTotal: 2064380 kB
SwapFree: 2064380 kB
Shmem: 4052 kB
Slab: 66784 kB
SReclaimable: 30052 kB
SUnreclaim: 36732 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$" /etc/passwd | cut -d: -f1
root
sync
shutdown
halt
ddw
ee
user
dd
lvs
linuxso
python
ddddd
mandriva
slackware
openstack
hadoop
[root@localhost ~]#
8、 显示/etc/passwd文件中其默认shell为/bin/bash的用户;
[root@localhost ~]# grep "/bin/bash$" /etc/passwd | cut -d: -f1
root
ddw
ee
user
dd
lvs
linuxso
python
ddddd
mandriva
openstack
[root@localhost ~]#
9、 找出/etc/passwd文件中的一位数或两位数;
[root@localhost ~]# cat /etc/passwd | grep -o '\<[0-9]\>\|\<[0-9][0-9]\>'
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
69
69
68
68
38
38
48
48
76
89
89
42
42
74
74
72
72
[root@localhost ~]#
10、 显示/boot/grub/grub.conf中以至少一个空白字符开头的行;
[root@localhost ~]# cat /boot/grub/grub.conf | grep "^[[:space:]]\+.*"
root (hd0,0)
kernel /vmlinuz-2.6.32-504.el6.i686 ro root=UUID=e6891007-5edb-4ec9-b9af-2e0a319bcde5 rd_NO_LUKS rd_NO_LVM.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /initramfs-2.6.32-504.el6.i686.img
[root@localhost ~]#
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
# /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
[root@localhost ~]#
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 | grep "LISTEN[[:space:]]\+$"
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 :::22 :::* LISTEN
tcp 0 0 ::1:631 :::* LISTEN
tcp 0 0 ::1:25 :::* LISTEN
[root@localhost ~]#
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 ~]# cat /etc/passwd | grep "^\(\<[[:alpha:]]\+\>\).*\1$"
\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:2004:2004::/home/bash:/bin/bash
nologin:x:2007:2007::/home/nologin:/sbin/nologin
[root@localhost ~]#
原创文章,作者:dengdw0917,如若转载,请注明出处:http://www.178linux.com/26746
评论列表(1条)
写的很好,排版还可以在漂亮一点,加油,第9题是让用{}做,在考虑考虑