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 -rf /etc/skel /home/tuser1 [root@localhost ~]#chmod -R g-rwx,o-rwx /home/tuser1 2、编辑/etc/group文件,添加组hadoop。 使用vim编辑器进入/etc/group文件中: nova:x:2019: clouds:x:2020: mysql:x:3004: openstack:x:3005: bash:x:3006: testbash:x:3007: baser:x:3008: nologin:x:3009: centos:x:3010: hadoop:x:3011: 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。 baser:x:3008:3008::/home/baser:/sbin/nologin nologin:x:3009:3009::/home/nologin:/sbin/nologin centos:x:3010:3010::/home/centos:/bin/bash hadoop:x:3011:3011::/home/hadoop:/bin/bash [root@localhost etc]# id hadoop uid=3011(hadoop) gid=3011(hadoop) groups=3011(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@localhost etc]# cp -rfv /etc/skel/ /home/hadoop `/etc/skel/' -> `/home/hadoop/skel' `/etc/skel/.bashrc' -> `/home/hadoop/skel/.bashrc' `/etc/skel/.mozilla' -> `/home/hadoop/skel/.mozilla' `/etc/skel/.mozilla/extensions' -> `/home/hadoop/skel/.mozilla/extensions' `/etc/skel/.mozilla/plugins' -> `/home/hadoop/skel/.mozilla/plugins' `/etc/skel/.bash_logout' -> `/home/hadoop/skel/.bash_logout' `/etc/skel/.bash_profile' -> `/home/hadoop/skel/.bash_profile' `/etc/skel/.gnome2' -> `/home/hadoop/skel/.gnome2' [root@localhost skel]# chmod -R g-rwx,o-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 hadoop]# chown -R hadoop /home/hadoop/ [root@localhost hadoop]# chgrp -R 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 -i "^s" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 2788 kB Slab: 98996 kB SReclaimable: 42476 kB SUnreclaim: 56520 kB [root@localhost ~]# grep -i "^[sS]" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 2788 kB Slab: 99008 kB SReclaimable: 42476 kB SUnreclaim: 56532 kB 7、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户; [root@localhost ~]# egrep -v "(/sbin/nologin)$" /etc/passwd | cut -d':' -f1 root sync shutdown halt wostop user1 gentoo mageia shackware nova openstack centos hadoop 8、显示/etc/passwd文件中其默认shell为/bin/bash的用户; [root@localhost ~]# egrep "(/bin/bash)$" /etc/passwd | cut -d':' -f1 root wostop user1 mageia nova openstack centos hadoop 9、找出/etc/passwd文件中的一位数或两位数; [root@localhost ~]# grep "\<[0-9]\{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 ~]# egrep "^[[: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 ~]# egrep "^[#][[: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 | egrep "\<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 ~]# egrep "^(\<[[:alnum:]]+\>)+.*\1$" /etc/passwd sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt nologin:x:3009:3009::/home/nologin:/sbin/nologin 14、显示/proc/meminfo文件中以大写或小写S开头的行;用三种方式; [root@localhost ~]# grep -i "^s" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 2788 kB Slab: 99100 kB SReclaimable: 42556 kB SUnreclaim: 56544 kB [root@localhost ~]# grep "^[sS]" /proc/meminfo SwapCached: 0 kB SwapTotal: 2097144 kB SwapFree: 2097144 kB Shmem: 2788 kB Slab: 99096 kB SReclaimable: 42556 kB SUnreclaim: 56540 kB [root@localhost ~]# egrep "^(S|s)" /proc/meminfo 15、显示/etc/passwd文件中其默认shell为非/sbin/nologin的用户; [root@localhost ~]# egrep -v "/sbin/nologin$" /etc/passwd | cut -d':' -f1 root sync shutdown halt wostop user1 gentoo mageia shackware nova openstack centos hadoop 16、显示/etc/passwd文件中其默认shell为/bin/bash的用户; [root@localhost ~]# egrep "/bin/bash$" /etc/passwd | cut -d':' -f1 root wostop user1 mageia nova openstack centos hadoop 17、找出/etc/passwd文件中的一位数或两位数; egrep "\<([0-9]{1,2})\>" /etc/passwd
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评论列表(1条)
写的很好,排版也很棒,加油