Marco Linux jobs 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 Go-rwx/home/tuser1

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

Vim/etc/group

First check for Hadoop groups: enter "/hadoop"

If not, add in the last line: enter ":" into edit mode, move to the last line, enter "hadoop:x:2016:" After carriage return

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.

vim/etc/passwd

First Look at Hadoop users: enter "/hadoop"

If not, add in the last line: enter ":" into edit mode, move to the last line, enter "Hadoop:x:2016:2016::/home/hadoop:/bin/bash" after carriage return

If any, replace the line with the following: "Hadoop:x:2016:2016::/home/hadoop:/bin/bash"

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 go-rwx/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/hadoop

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

grep ^[ss]/proc/meminfo

Grep-i ^[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 | Cut-d:-f1

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

grep "/bin/bash"/etc/passwd | Cut-d:-f1

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

Grep-o "\<[0-9]\{1,2\}\>"/etc/passwd

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

Grep-e "^[[:space:]]+"/boot/grub/grub.conf

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-e ' ^#[[:space:]]+[^[: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 user name and default shell of the current system on the same user information;

Useradd bash && useradd testbash && useradd basher && useradd-s/sbin/nologin nologin

grep ' ^\ ([[: alnum:]]\+\>\). *\1$ '/etc/passwd

Marco Linux jobs Fourth week '