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 (复制/etc/skel为/home/tuser1)
[root@localhost ~]# chmod -R 700 /home/tuser1 （修改/home/tuser1目录及其内部所有文件的权限）
[root@localhost ~]# ll -d /home/tuser1;ll -a /home/tuser1 （查看修改后的结果）
drwx——. 2 root root 59 Aug 29 12:25 /home/tuser1
total 12
drwx——. 2 root root 59 Aug 29 12:25 .
drwxr-xr-x. 9 root root 102 Aug 29 12:25 .. （此目录是/home/tusr1的上一级目录，所以权限没有改变）
-rwx——. 1 root root 18 Aug 29 12:25 .bash_logout
-rwx——. 1 root root 193 Aug 29 12:25 .bash_profile
-rwx——. 1 root root 231 Aug 29 12:25 .bashrc
2、编辑/etc/group文件，添加组hadoop。
[root@localhost ~]# vim /etc/group （用vim编辑/etc/group文件）
hadoop:x:4000: （在文件的最后写入此行，保存退出）
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 （用vim编辑/etc/passwd文件）
hadoop:x:3006:4000:/home/hadoop:/bin/bash （在文件的最后写入此行，保存退出）
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 （复制/etc/skel为/home/hadoop）
[root@localhost ~]# chmod 700 /home/hadoophome/hadoop (修改/home/hadoop目录权限)
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 （修改/home/hadoop目录及其内部文件的属主和属主）
[root@localhost ~]# ll -d /home/hadoop;ll -a /home/hadoop （查看修改后的结果）
drwx——. 2 hadoop hadoop 59 Aug 29 12:53 /home/hadoop
total 16
drwx——. 2 hadoop hadoop 59 Aug 29 12:53 .
drwxr-xr-x. 10 root root 4096 Aug 29 12:53 ..
-rwx——. 1 hadoop hadoop 18 Aug 29 12:53 .bash_logout
-rwx——. 1 hadoop hadoop 193 Aug 29 12:53 .bash_profile
-rwx——. 1 hadoop hadoop 231 Aug 29 12:53 .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 -i "^s" /proc/meminfo （grep "^[sS]" /proc/meminfo） (grep -E "^(s|S)" /proc/meminfo)
SwapCached: 0 kB
SwapTotal: 1952764 kB
SwapFree: 1952764 kB
Shmem: 6856 kB
Slab: 55008 kB
SReclaimable: 20496 kB
SUnreclaim: 34512 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
mageia
slackware
openstack
user1
user2
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
mageia
openstack
user1
user2
hadoop
9、找出/etc/passwd文件中的一位数或两位数；
[root@localhost grub]# grep "\<[[:digit:]]\{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
tss:x:59:59:Account used by the trousers package to sandbox the tcsd daemon:/dev/null:/sbin/nologin
postfix:x:89:89::/var/spool/postfix:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
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-2.6.32-431.el6.x86_64 ro root=/dev/mapper/VolGroup-lv_root rd_NO_LUKS.UTF-8 rd_NO_MD rd_LVM_LV=VolGroup/lv_swap SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_LVM_LV=VolGroup/lv_root KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /initramfs-2.6.32-431.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.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@localhost ~]# netstat -tan| grep -E "LISTEN[[:space:]]*$"
tcp 0 0 0.0.0.0:48333 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 :::111 :::* LISTEN
tcp 0 0 :::22 :::* LISTEN
tcp 0 0 ::1:631 :::* LISTEN
tcp 0 0 :::42999 :::* LISTEN
tcp 0 0 ::1:25 :::* LISTEN
13、添加用户bash, testbash, basher, nologin (此一个用户的shell为/sbin/nologin)，而后找出当前系统上其用户名和默认shell相同的用户的信息；
[root@localhost ~]# grep -E "(^[^:]+\>).*\1$" /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
nologin:x:1001:1001::/home/nologin:/sbin/nologin
bash:x:1002:1002::/home/bash:/bin/bash
原创文章，作者：heianyangguo，如若转载，请注明出处：http://www.178linux.com/41740
评论列表（1条）
答题认真，如果能很好的使用markdown会更好哦~加油~