Linux Learning Assignments-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.

Cp-r/etc/skel//home/tuser1

Chmod-r 700/home/tuser1

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

echo "hadoop:x:1103" >>/etc/group

3. Manually edit the/etc/passwd 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.

echo "Hadoop:x:1103:1103::/home/hadoop" >>/etc/passwd

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.

Cp-r/etc/skel/home/hadoop

Chmod-r 700/home/hadoop

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

Chown-r Hadoop:hadoop/home/hadoo

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

Grep-i ^s/proc/meminfo

Egrep ^[s,s]/proc/meminfo

7. Display the default shell of the/etc/passwd file as a non-/sbin/nologin user;

Grep-v sbin/nologin/etc/passwd

8. Display the user whose default shell is/bin/bash in/etc/passwd file;

grep/bin/bash/etc/passwd

9. Find out one or two digits in the/etc/passwd file;

grep [[:d igit:]][1,2]/etc/passwd

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

cat/boot/grub/grub.conf |grep ^[[:space:]]

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;

grep ^#[[:space:]]/etc/rc.d/rc.sysinit

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

Netstat-tan|grep Listen[[:space:]]

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;

Useradd Bash

Useradd Testbash

Useradd basher

Useradd-s/sbin/nologin Nologin

grep--color "^\ ([[: alnum:]]\+\). *\1$"/etc/passwd

Linux Learning Assignments-fourth week