Marco 2016 new Linux+python high-end Operation fourth week

1, the Replication/etc/skel directory is/home/tuser1, requires/home/tuser1 and its internal files belong to the group and other users do not have any access rights.

A: ① copy files and view their permissions 650) this.width=650; "Src=" http://s3.51cto.com/wyfs02/M00/86/80/wKiom1fBDirxh2sJAAAp6PYxgZI373.jpg "Title=" 1.jpg "alt=" wkiom1fbdirxh2sjaaap6pyxgzi373.jpg "/>② Modify permissions for/home/tuser1

650) this.width=650; "src=" http://s4.51cto.com/wyfs02/M01/86/80/wKioL1fBEGqQYzbvAABMPZtBMWM361.jpg "title=" 1.jpg " alt= "Wkiol1fbegqqyzbvaabmpztbmwm361.jpg"/>

2. Edit the/etc/group file and add the group Hadoop.

A: Use Vim to edit the/etc/group, add Hadoop to the file in the format, and then save the exit;

[Email protected] ~]# Vim/etc/group

650) this.width=650; "src=" http://s5.51cto.com/wyfs02/M00/86/80/wKiom1fBHXyDrpyuAAAQKb6sFrc305.jpg "title=" 1.jpg " alt= "Wkiom1fbhxydrpyuaaaqkb6sfrc305.jpg"/>

Extensions: You can also use echo to add directly

650) this.width=650; "src=" http://s2.51cto.com/wyfs02/M00/86/80/wKiom1fBHbbjjeQgAAAdiH1QRaE309.jpg "title=" 1.jpg " alt= "Wkiom1fbhbbjjeqgaaadih1qrae309.jpg"/>

3. Manually edit the/ETC/PASSW D file to add a new line, adding user Hadoop, whose basic group ID is the Hadoop group ID number; its home directory is/home/hadoop.

Answer: VI Edit/etc/passwd file

[Email protected] ~]# Vim/etc/group

Enter the following information:

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Extensions: You can also use the Echo method to add

650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M00/86/80/wKiom1fBKVHg-TLwAAAwWlG9iTY993.jpg "title=" 1.jpg " alt= "Wkiom1fbkvhg-tlwaaawwlg9ity993.jpg"/>

4. Copy the/etc/skel directory as/home/hadoop, which requires that the genus Group and other users of the Hadoop directory be modified without any access rights.

Answer: 650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M00/86/80/wKioL1fBK2qxM0gwAAB_FIoujOQ878.jpg "title=" 1. JPG "alt=" wkiol1fbk2qxm0gwaab_fioujoq878.jpg "/>

5, modify the/home/hadoop directory and all the internal files of the owner of Hadoop, belong to Hadoop group.

Answer: # chown-r Hadoop:hadoop/home/hadoop

6. Display the lines in the/proc/meminfo file beginning with uppercase or lowercase s, in two ways;

A: ① query 650 with grep case-insensitive) this.width=650; "Src=" http://s3.51cto.com/wyfs02/M01/86/81/ Wkiol1fbuohtbkafaaapu-yqkge365.jpg "title=" 1.jpg "alt=" Wkiol1fbuohtbkafaaapu-yqkge365.jpg "/>

② using an extended regular expression

650) this.width=650; "src=" http://s4.51cto.com/wyfs02/M02/86/81/wKiom1fBWPDz68KWAAAdyUTER5I122.jpg "title=" 1.jpg " alt= "Wkiom1fbwpdz68kwaaadyuter5i122.jpg"/>

7. Display/ETC/PASSW D file whose default shell is non-/sbin/nologin user;

Answer: 650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M01/86/81/wKiom1fBWwfiePWuAACFO9IeVhk231.jpg "title=" 1. JPG "alt=" wkiom1fbwwfiepwuaacfo9ievhk231.jpg "/>

8. Display the user whose default shell is/bin/bash in/ETC/PASSW D file;

Answer: 650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M01/86/82/wKiom1fBZ-zTZ9p_AAA1jYWW1RQ770.jpg "title=" 1. JPG "alt=" wkiom1fbz-ztz9p_aaa1jyww1rq770.jpg "/>

9. Find out one or two digits in/ETC/PASSW D file;

Answer: 650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M02/86/82/wKioL1fBi-WgnL3hAAF8O6IZU1Y910.jpg "title=" 1. JPG "style=" float:left; "alt=" wkiol1fbi-wgnl3haaf8o6izu1y910.jpg "/>

10. Display the line beginning with at least one blank character in/boot/grub/grub.conf;

Answer: 650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/86/82/wKioL1fBdpDyGpCRAACAi1hADIw305.jpg "title=" 1. JPG "alt=" wkiol1fbdpdygpcraacai1hadiw305.jpg "/>

11, the display/etc/rc.d/rc.sysinit file with the beginning of #, followed by at least one white space character, and then have at least one non-whitespace character line;

Answer: 650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/86/83/wKioL1fBq6GgBLkvAAgq_CeaV0E389.jpg "title=" 1. JPG "alt=" wkiol1fbq6ggblkvaagq_ceav0e389.jpg "/>

12, the Netstat-tan command execution results in the "LISTEN", followed by or with a blank character end of the line;

Answer: 650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/86/82/wKiom1fBeTLStyXDAABFs42MOE4157.jpg "title=" 1. JPG "alt=" wkiom1fbetlstyxdaabfs42moe4157.jpg "/>

13, add user bash, Testbash, basher, Nologin (this one user's shell is/sbin/nologin), and then find the current system on its user name and the default shell of the same user information;

Answer: 650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/86/83/wKiom1fBqk_DHbbeAAL-ltiKwsQ680.jpg "title=" 1. JPG "alt=" wkiom1fbqk_dhbbeaal-ltikwsq680.jpg "/>

This article from "Time book" blog, declined reprint!

Marco 2016 new Linux+python high-end Operation fourth week