Linux Basic 6:vim and some shell scripts

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;

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

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

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

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

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

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

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

Script Programming Exercises

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

# tt= ' Date ' +%y-%m-%d_%h:%m ' && mkdir "/tmp/testdir-$tt" && ls-d!$/tmp/testdir-2016-09-02_19:38:29

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

# vim/tmp/test11.sh

#!/bin/bash#for N in {1..100};d o [-D "/tmp/file$n"] &>/dev/null | | mkdir "/tmp/file$n" done

# bash /tmp/test11.sh# ls -d /tmp/file*/tmp/file1    /tmp/file18   /tmp/file27  /tmp/file36  /tmp/file45  /tmp/file54                                           /tmp/file63  /tmp/file72  /tmp/file81  /tmp/file90/tmp/file10    /tmp/file19  /tmp/file28  /tmp/file37  /tmp/file46  /tmp/file55                                           /tmp/file64  /tmp/file73  /tmp/file82  /tmp/file91/tmp/ File100  /tmP/file2   /tmp/file29  /tmp/file38  /tmp/file47  /tmp/file56                                            /tmp/file65  /tmp/file74  /tmp/file83  /tmp/file92 /tmp/file11   /tmp/file20  /tmp/file3   /tmp/file39  /tmp/ file48  /tmp/file57                                         /tmp/file66  /tmp/file75  /tmp/file84   /tmp/file93/tmp/file12   /tmp/file21  /tmp/file30  /tmp/file4    /tmp/file49  /tmp/file58                                          /tmp/file67  /tmp/file76  /tmp/file85   /tmp/file94/tmp/file13   /tmp/file22  /tmp/file31  /tmp/file40   /tmp/file5   /tmp/file59                                          /tmp/file68  /tmp/file77   /tmp/file86  /tmp/file95/tmp/file14   /tmp/file23  /tmp/file32   /tmp/file41  /tmp/file50  /tmp/file6                                         /tmp/file69  /tmp/file78  /tmp/ file87  /tmp/file96/tmp/file15   /tmp/file24  /tmp/file33  /tmp/ file42  /tmp/file51  /tmp/file60                                         /tmp/file7   /tmp/ file79  /tmp/file88  /tmp/file97/tmp/file16   /tmp/file25  /tmp/ file34  /tmp/file43  /tmp/file52  /tmp/file61                                         /tmp/file70  /tmp/file8   / tmp/file89  /tmp/file98/tmp/file17   /tmp/file26  /tmp/file35  / tmp/file44  /tmp/file53  /tmp/file62                                         /tmp/file71  /tmp/file80   /tmp/file9   /tmp/file99

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

# vim/tmp/test12.sh

#!/bin/bash#

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

# vim/tmp/test13.sh

#!/bin/bash#for x in {10..19};d o if! ID user$x &>/dev/null;then useradd user$x fi echo "user$x" | passwd--stdin user$x &>/dev/nulldone

# bash /tmp/test13.sh# grep  "^user1[0-9]"  /etc/passwduser1:x:3016:3018::/home/user1:/ bin/bashuser90:x:3017:3030::/home/user90:/bin/bashuser98:x:3018:3031::/home/user98:/bin/bashuser10:x:3019:3020 ::/home/user10:/bin/bashuser11:x:3020:3021::/home/user11:/bin/bashuser12:x:3021:3022::/home/user12:/bin/ bashuser13:x:3022:3032::/home/user13:/bin/bashuser14:x:3023:3023::/home/user14:/bin/bashuser15:x:3024:3024::/ home/user15:/bin/bashuser16:x:3025:3025::/home/user16:/bin/bashuser17:x:3026:3026::/home/user17:/bin/ bashuser18:x:3027:3027::/home/user18:/bin/bashuser19:x:3028:3028::/home/user19:/bin/bash# grep  "^ USER1[0-9] " /etc/shadow |cut -d: -f1,2user10:$6$ptzjnxme$k8/ wldibuhlxdmmzv89fwcnxcb3lpgbdqnyez19xreo3mwvacxveucsojbsezoqpbkth1wuzq39yy$user11:$6$t/geqh.l$ 4g2mczv22cwfvd03z7rv7g8dmk/u8dkodau5xmovywdmgfypo3zn8xhzjjcae0oxdcayi/9ekikgf$user12:$6$apvohbyv$ 7qwyd7r.kj4zrynuejclfzrecksdeiwvp1paqzdbkomdpqiwot2u1mrq8kpyin4xdvdtpjiz/efyl$user13:$6$kv8upaa9$dgvk5hhp4xvr.npvti1mamzyrvoewxxef1hlastqnshq9x3jurbjtglltbocjy2zxa43xxgpwebwc$user14:$6$1r4cy8be$ mkfsf3afbhih2w4jgzjt5iio2ge2y00fv5/oekx/6qwo/p95fhkp70rxriqil9/bkcsi1gh7yoocx$user15:$6$b0ustd5w$ br4ejvrplimx.emv4y8ih.vg.uf9.t4tznaiqjyohsqjvsafpz/ygncon4qxk8u2wp/rhelnlh8j5$user16:$6$wf3odfsz$rk6.dr79p/ WCPWQ45K1C.M5WJRSOSRCYTL50EH.1UCXL. Joir/zvwy5bkyev6iujonhw7lw0oh34$user17:$6$qmszh8wr$qltnqak/viiytlz6ogdhfgdyzvkzchgcvifwt8w6ilncnchwgqeo8g/lj. p462yfgcvnu2oxcbxjy$user18:$6$qgjpui4i$ 1qrvemxebo3olxwgwuwsnuump0s0ivgddwwsxwudi9lvngvyd6vkxa9051qxyue0carcutsnhbvsp$user19:$6$ehlb9bfu$ bpoupp8ghcsp.i8nlhsqepztxtge2p/s9fgpepls6g9myvjbjhpdwhccpjtvr63iqkzo10l5lyepi$

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

# vim/tmp/test14.sh

#!/bin/bash#for CreateFile in {10..19};d o if [!-e "/tmp/file$createfile"];then Touch "/tmp/file$createfile" Fidonels-l/tmp/file1[0-9]

# bash /tmp/test14.sh-rw-r--r--.  1 root root 0 9 Month    2  16:58 /tmp/file10-rw-r--r--.  1 root root 0 9 Month    2 16:58  /tmp/file11-rw-r--r--.  1 root root 0 9 Month    2 16:58 /tmp /file12-rw-r--r--.  1 root root 0 9 Month    2 16:58 /tmp/ File13-rw-r--r--.  1 root root 0 9 Month    2 16:58 /tmp/ File14-rw-r--r--.  1 root root 0 9 Month    2 16:58 /tmp/ File15-rw-r--r--.  1 root root 0 9 Month    2 16:58 /tmp/ File16-rw-r--r--.  1 root root 0 9 Month    2 16:58 /tmp/ File17-rw-r--r--.  1 root root 0 9 Month    2 16:58 /tmp/ File18-rw-r--r--.  1 root root 0 9 Month   &nbsP;2 16:58 /tmp/file19 

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

# vim/tmp/test15.sh

#!/bin/bash#for i in {10..19};d o if! grep "^user$i"/etc/group >&/dev/null;then groupadd "user$i" fi if! ID "user$i" &>/dev/null;then useradd-g user$i user$i fi chown user$i:user$i "/tmp/file$i" done

[[email protected] ~]# bash /tmp/test15.sh | ls -l /tmp/file1[0-9]- Rw-r--r--.  1 user10 user10 0 9 Month    2 16:58 /tmp/ File10-rw-r--r--.  1 user11 user11 0 9 Month    2 16:58 /tmp/ File11-rw-r--r--.  1 user12 user12 0 9 Month    2 16:58 /tmp/ File12-rw-r--r--.  1 user13 user13 0 9 Month    2 16:58 /tmp/ File13-rw-r--r--.  1 user14 user14 0 9 Month    2 16:58 /tmp/ File14-rw-r--r--.  1 user15 user15 0 9 Month    2 16:58 /tmp/ File15-rw-r--r--.  1 user16 user16 0 9 Month    2 16:58 /tmp/ File16-rw-r--r--.  1 user17 user17 0 9 Month    2 16:58 /tmp/ File17-rw-r--r--.  1 user18 user18 0 9 Month     2 16:58 /tmp/file18-rw-r--r--.  1 user19 user19 0 9 Month     2 16:58 /tmp/file19

Linux Basic 6:vim and some shell scripts