"Linux Basics" week sixth job

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;

Cp/etc/rc.d/rc.sysinit/tmp/sed-n ' S/^\ ([[: space:]]\+\)/#\1/p '/tmp/rc.sysinit

[[email protected] tmp]# sed-n ' s/^\ ([[: space:]]\+\)/#\1/p ' Rc.sysinit #. /etc/sysconfig/network# hostname=localhost#mount-n-T proc/proc/proc#mount-n-t Sysfs/sys/sys >/dev/null 2> &1 #vim/tmp/rc.sysinit:%s/^[[:space:]]\+/\#&/g

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

Cp/boot/grub/grub.conf/tmp/sed-n ' s/^[[:space:]]\+//p '/tmp/grub.conf

[[email protected] tmp]# sed-n ' s/^[[:space:]]\+//p ' grub.conf root (hd0,0) kernel/vmlinuz-2.6.32-642.el6.x86_64 ro root =uuid=95f5aeee-4932-4521-8a87-7134ed8ae784 Rd_no_luks RD_NO_LVM. UTF-8 rd_no_md sysfont=latarcyrheb-sun16 crashkernel=auto keyboardtype=pc keytable=us Rd_NO_DM rhgb quietinitrd/ Initramfs-2.6.32-642.el6.x86_64.img

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

Sed-n ' s/^#[[::space]]\+//p '/tmp/rc.sysinit

[[email protected] tmp]# sed-n '/^#[[:space:]]\+/p ' rc.sysinit#/etc/rc.d/rc.sysinit-run once at boot time# taken in PA RT from Miquel van Smoorenburg ' s bcheckrc.# Check SELinux status# Print A text banner.# only read this once.# Initialize h Ardware

To delete a replacement:

[[email protected] tmp]# sed-n ' s/^#[[:space:]]\+//p ' rc.sysinit/etc/rc.d/rc.sysinit-run once at boot Timetaken in par T from Miquel van Smoorenburg ' s BCHECKRC. Check SELinux statusprint a text banner. Only read this once. Initialize Hardware

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

Sed-n ' 1,3s/^/#/p '/tmp/grub.conf

[[email protected] tmp]# sed-n ' 1,3s/^/#/p ' grub.conf # # grub.conf generated by anaconda#### O Rerun grub after making changes to the This file

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] tmp]# sed-n-e/enabled/s/0/1/p-e/gpgcheck/s/0/1/p/etc/yum.repos.d/centos-media.repo enabled=1

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] TMP]CRONTAB-E0 */4 * * * cp-r/etc//backup/etc-' Date +%y%m%d%h%m '

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

[[email protected] TMP]CRONTAB-E0 0 * * */2,4,6 cp/var/log/messages/backup/messages_logs/messages-' date +%y%m%d '

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] tmp]mkdir/stats/[[email protected] tmp]touch/stats/memory.txt[[email protected] tmp]crontab-e0 */2 * * * * sed-n '/^s/p '/proc/meminfo >>/stats/memory.txt

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

[[email protected] TMP]CRONTAB-E0 */2 * * * echo "howdy"

Script Programming Exercises

10, Create the directory /tmp/testdir-the current date and time;

Mkdir-p/tmp/testdir-' Date +%y%m%d%h%m '

#!/bin/bash#name:mkdir.sh#version:v0.1mkdir-p/tmp/testdir-' Date +%y%m%d%h%m%s '

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

#!/bin/bash#name:mkdir100.sh#version:v0.1touch./file{1..100}

#!/bin/bash#name:mkdir10.sh#version:v0.1for i in {1..10};d o touch./file$idone

12. Display the user name of the user who is located in the/ETC/PASSW D file in the first even row;

[Email protected] scripts]# sed-n ' n;p '/etc/passwd|cut-d:-f1binadmsynchaltuucpgamesftpdbus

[Email protected] scripts]# awk-f: ' {if (nr%2==0) print nr,$1} '/etc/passwd2 bin4 adm6 sync8 halt10 uucp12 games14 ftp16 D Bus

create 10 user user10-user19; password with user name;

#!/bin/bash#name:mkdir10.sh#version:v0.1if [ !  $UID  -eq 0 ];then     echo  "Only root"     exit 2fifor i in {10..19};d O     if id user$i &> /dev/dull ;then         echo  "User$i exists"     else         useradd user$i             if [ $? -eq 0 ];then                 echo  "User$i"  | passwd --stdin user$i  &> /dev/dull                 echo  "Add user$i finished"              fi &nBsp;  fidone 

14, create 10 empty files File10-file19 in /tmp/;

#!/bin/bash#version:v0.1touch/tmp/file{10..19}

15. Change the File10 and the genus to user10, and so on.

#!/bin/bash#name:mkdir10.sh#version:v0.1for i in {10..19};d o chown user$i:user$i/tmp/file$idone

Seven Stars Acacia: PTTING:FORESTLP

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"Linux Basics" week sixth job