Week six Homework

Content of this week's 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;

For:

[Email protected] ~]# cp/etc/rc.d/rc.sysinit/tmp/[[email protected] ~]# sed-i ' s/\ (^[[:space:]]\)/#\1/g '/tmp/rc.sysi Nit

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

For:

[[email protected] ~]# cp /boot/grub/grub.conf /tmp/[[email protected] ~]#  sed  -i  ' s/^[[:space:]]\+//g '  /tmp/grub.conf[[email protected] ~]#  cat /tmp/grub.conf # grub.conf generated by anaconda## note that  you do not have to rerun grub after making changes to  this file# notice:  you have a /boot partition.  this  means that#          all kernel and  initrd paths are relative to /boot/, eg.#           root  (hd0,0) #          kernel  /vmlinuz-version ro root=/dev/mapper/VolGroup-lv_root#           initRd /initrd-[generic-]version.img#boot=/dev/sdadefault=0timeout=5splashimage= (hd0,0)/grub/ splash.xpm.gzhiddenmenutitle centos 6  (2.6.32-642.el6.x86_64) root  (hd0,0) kernel / Vmlinuz-2.6.32-642.el6.x86_64 ro root=/dev/mapper/volgroup-lv_root rd_no_luks lang=en_us. utf-8 rd_no_md rd_lvm_lv=volgroup/lv_swap sysfont=latarcyrheb-sun16 crashkernel=auto  rd_lvm_lv=volgroup/lv_root  keyboardtype=pc keytable=us rd_no_dm rhgb  quietinitrd /initramfs-2.6.32-642.el6.x86_64.img[[email protected] ~]#

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

For:

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

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

For:

[[email protected] ~]# sed -i  ' 1,3s/\ (^.\)/#\1/g '  /tmp/grub.conf [[email  protected] ~]# cat /tmp/grub.conf ## grub.conf generated by  Anaconda#### note that you do not have to rerun grub after  making changes to this file# notice:  you have a /boot  partition.  This means that#           all kernel and initrd paths are relative to /boot/, eg.#           root  (hd0,0) #           kernel /vmlinuz-version ro root=/dev/mapper/volgroup-lv_root#           initrd /initrd-[generic-]version.img#boot=/ Dev/sdadefault=0timeout=5splashiMage= (hd0,0)/grub/splash.xpm.gzhiddenmenutitle centos 6  (2.6.32-642.el6.x86_64) root  (hd0,0 ) Kernel /vmlinuz-2.6.32-642.el6.x86_64 ro root=/dev/mapper/volgroup-lv_root rd_no_luks  lang=en_us. utf-8 rd_no_md rd_lvm_lv=volgroup/lv_swap sysfont=latarcyrheb-sun16 crashkernel=auto  rd_lvm_lv=volgroup/lv_root  keyboardtype=pc keytable=us rd_no_dm rhgb  quietinitrd /initramfs-2.6.32-642.el6.x86_64.img[[email protected] ~]#

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

For:

[[email protected] ~]#  sed  ' s/enabled=0/enabled=1/g;s/gpgcheck=0/gpgcheck=1/g '   /etc/yum.repos.d/centos-media.repo   # centos-media.repo##  this repo  Can be used with mounted dvd media, verify the mount point  for#  centos-6.  you can use this repo and yum to  install items directly off the#  DVD ISO that we  Release.## to use this repo, put in your dvd and use it  with the other repos too:#  yum --enablerepo=c6-media [command]#   # or for only the media repo, do this:##  yum  --disablerepo=\* --enablerepo=c6-media [command] [c6-media]name=centos-$releasever  -  mediabaseurl=file:///media/centos/        file:///media/cdrom/         file:///media/cdrecorder/gpgcheck=1enabled=1gpgkey=file:///etc/pki/rpm-gpg/ rpm-gpg-key-centos-6[[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

For:

[[email protected] ~]# mkdir/backup[[email protected] ~]# crontab-e Add */4 * * * * cp-rf/etc/backup/etc\-$ (date + "% Y%m%d%h%m ") to save the exit.

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

For:

[[email protected] ~]# mkdir-p/backup/messages_logs[[email protected] ~]# CRONTAB-E Add * * * * 2,4,6 cp-rf/var/log/ messages/backup/messages_logs/messages\-$ (date + "%y%m%d") saves the exit.

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

For:

[[email protected] ~]# mkdir/stats[[email protected] ~]# crontab-e add 1 */2 * * * grep "^[s,s]"/proc/meminfo >>/S Tats/memory.txt Save exit.

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

For:

[[email protected] ~]# CRONTAB-E Add * */2 * * 1-5 echo "Howdy" save exit.

Script Programming Exercises

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

For:

#!/bin/bashdate= ' date + '%y%m%d%h%m ' mkdir/tmp/testdir-$date

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

For:

#!/bin/bashfor i in ' seq + ' do touch/tmp/$date/file$idone

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

For:

Sed-n "N;p"/etc/passwd

13. Create 10 user user10-user19, password and user name;

For:

#!/bin/bashfor i in {10..19};d ouseradd "User$i" echo "user$i" |passwd--stdin User$idone

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

For:

#!/bin/bashfor i in {10..19};d Omkdir/tmp/file$idone

15. Change the file10 and the genus to user10, and so on.

For:

#!/bin/bashfor i in {10..19};d ochown "user$i"/tmp/file$idone

Week six Homework