Week six Homework

1. Copy the/etc/rc.d/rc.sysinit file to the/tmp directory and add # to the beginning of the line with at least one whitespace character in the/tmp/rc.sysinit file;

[Email protected] ~]# cp/etc/rc.d/rc.sysinit/tmp/| Sed-i '/^[[:space:]]\+/i\# '/tmp/rc.sysinit

[Email protected] ~]# cp/etc/rc.d/rc.sysinit/tmp/| Sed-i ' [email protected]^[[:space:]]\[email protected] ' # ' &@g '/tmp/rc.sysinit# the first question was added to the beginning of the SED, i,\n can be used to add multiple lines, The other is to use the alternate back reference

2, copy/boot/grub/grub.conf to/tmp directory, delete the blank character of the beginning of the/tmp/grub.conf file;

[Email protected] ~]# Cp-i/boot/grub/grub.conf/tmp/| Sed-i '/^[[:space:]]\+/d '/tmp/grub.conf

[Email protected] ~]# Cp-i/boot/grub/grub.conf/tmp/| Sed-i ' [email protected]^[[:space:]]\[email protected]@g '/tmp/grub.conf

#第二题用到了sed的删除d, and replace

3. Remove the # and white space characters from the/tmp/rc.sysinit file that begin with # and followed by at least one white-space character

[Email protected] ~]# sed-i '/^#[[:space:]]\+/d '/tmp/rc.sysinit

[Email protected] ~]# sed-i ' [email protected]^#[[:space:]]\[email protected]@g '/tmp/rc.sysinit

#第三题用到了sed的删除d, and replace

4. Add # to the beginning of the first three lines in the/tmp/grub.conf file

[Email protected] ~]# vim/tmp/grub.conf:1,3s/^/#/#在vim末行模式中输入

5. Change the last 0 of all enabled=0 or gpgcheck=0 in the/etc/yum.repos.d/centos-media.repo file to 1;

[Email protected] ~]# vim/etc/yum.repos.d/centos-media.repo:%[email protected][email protected][email protected]

6, every 4 hours to perform a backup of the/etc directory, back up to the/backup directory, save the directory named Shape etc-201608300202

[email protected] ~]# which CP #先查看cp命令的路径alias cp= ' cp-i '/bin/cp[[email protected] ~]# crontab-l #- e Edit,-l view edited commands below best use absolute path * */4 * * */bin/cp/etc//backup/etc-$ (date +%f%h%m%s)

7, weekly 2,4,6 backup/var/log/messages file to/backup/messages_logs/directory, save the file name like messages-20160830

[Email protected] ~]# crontab-ecrontab:installing new crontab[[email protected] ~]# crontab-l* */4 * * */bin/cp/etc/ /backup/etc-$ (Date +%f%h%m%s) * * * * */2/bin/cp/var/log/messages/backup/messages_logs/messages-$ (date +%F%H%M%S)

8, every two hours every day to take the current system/proc/meminfo file in the beginning of all the information in the S./stats/memory.txt file

[Email protected] ~]# crontab-l* */2 */1 * */bin/grep "^s"/proc/meminfo >>/stats/memory.txt

9, working days of work time, every two hours to perform the echo "Howdy"

[Email protected] ~]# crontab-l* 10-19 * * 1-5 echo "Howdy" #每天10点到19点上班, didn't work Monday to Friday

Script Programming Exercises

10. Create directory/tmp/testdir-Current date time

[Email protected] bin]# vim 10.sh#!/bin/bash#test=testdir-$ (date +%f%h%m%s) mkdir/tmp/$test [[email protected] bin]# Bash-n 10.sh[[email protected] bin]# bash-x 10.sh++ date +%f%h%m%s+ test=testdir-2016-09-06215248+ mkdir/tmp/testdir-20 16-09-06215248

1 1. Create 100 empty files in this directory: file1-file100

[[email protected] bin]# vim 11.sh#!/bin/bash#for  i in {1..100}; dotouch file$i                      #touch为当前目录/root/bin, you can also indicate the directory where the files are to be created Echo   "new file  $i" Done[[email protected] bin]# bash -n 11.sh [[email  protected] bin]# bash -x 11.sh + for i in  ' {1..100} ' +  touch file1+ echo  ' new file 1 ' new file 1+ for i in  ' { 1..100} ' + touch file2+ echo  ' new file 2 ' new file 2+ for i  in  ' {1..100} ' + touch file3+ echo  ' new file 3 ' new file 3+  for i in  ' {1..100} ' + touch file4+ echo  ' new file 4 ' ... 

12. Displays the user name of the user in the/ETC/PASSW D file that is located in the even row

[Email protected] bin]# vim 12.sh#!/bin/bash#sed-n ' n;p '/etc/passwd | Awk-f: ' {print $} ' [[email protected] bin]# sh 12. Shbinadmsynchaltuucpgamesftpdbusvcsartkitabrtnfsnobodygdmapachepostfixtomcattcpdumpmyuser

13. Create 10 user user10-user19; password with user name

[Email protected] bin]# vim 13.sh#!/bin/bash#for i in {10..19}; Do Useradd user$i echo "User$i" | passwd--stdin "user$i" done [[e-mail protected] bin]# bash-n 13.sh [[email protected] bin]# bash-x 13.sh + for I in ' {10. . +} ' + Useradd user10useradd: Warning: This home directory already exists. Do not copy any files from the Skel directory to them. Creating mailbox file: File already exists + passwd--stdin user10+ echo user10 change user user10 password. PASSWD: All the authentication tokens have been successfully updated. + for I in ' {10..19} ' + Useradd user11+ echo user11+ passwd--stdin user11 change user user11 password ....

14, create 10 empty files file10-file19 in/tmp/;

[Email protected] bin]# vim 14.sh#!/bin/bash#for i in {10..19};  Dotouch/tmp/file$iecho "New file:file$i" Done[[email protected] bin]# bash-n 14.sh [[email protected] bin]# bash-x 14.sh + for I in ' {10..19} ' + touch/tmp/file10+ echo ' new File:file10 ' new file:file10+ for I in ' {10..19} ' + touch/tmp/file11+ Echo ' New File:file11 ' new file:file11+ for I in ' {10..19} ' + touch/tmp/file12+ echo ' new File:file12 ' ....

15. Change the File10 and the genus Group to User10, and so on.

#!/bin/bash#for i in {10..19}; dochown user "$i": User "$i"  /tmp/file$idone[[email  protected] bin]# ll /tmp/file*-rw-r--r--.  1 user10 user10 0 9 Month    6 22:30 /tmp/file10-rw-r--r--.  1 user11 user11 0 9 Month     6 22:30 /tmp/file11-rw-r--r--.  1 user12 user12 0 9 Month     6 22:30 /tmp/file12-rw-r--r--.  1 user13 user13 0 9 Month     6 22:30 /tmp/file13-rw-r--r--.  1 user14 user14 0 9 Month    6  22:30 /tmp/file14-rw-r--r--.  1 user15 user15 0 9 Month    6  22:30 /tmp/file15-rw-r--r--.  1 user16 user16 0 9 Month    6 22:30  /tmp/file16-rw-r--r--.  1 user17 user17 0 9 Month    6 22:30  /tmp/file17-rw-r--r--.  1 user18 user18 0 9 Month    6 22:30 /tmp/file18-rw-r--r--.  1 user19 user19 0 9 Month    6 22:30 /tmp/file19

This article is from the "Linux Sailing" blog, make sure to keep this source http://jiayimeng.blog.51cto.com/10604001/1846980

Week six Homework