Week six Homework

Off Topic:

1) Spit groove, as a person to see 37 knots, to do this week's work, can imagine the difficulty

2) Many of the files in the exercise do not exist on my system, so I will use the format approximation file as an alternative

3) I swapped the position of the third and second question, without affecting the test

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;

Ideas

1) Vim editor Internal instruction add

2) Use the SED command to add

Copy the file first,there is no/etc/rc.d/rc.sysinit this file on Fedora 23, I use/etc/rc.d/init.d/functions this file to replace

Cp/etc/rc.d/init.d/functions/tmpvim/tmp/functions# then enter the following:%[email protected]\ (^[[:space:]]\+\) @#\[email Protected

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Exit does not save

Now use the SED command to replace

Sed-i-R "s/(^[[:space:]]+)/#\1/g"/tmp/functions

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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

Using/tmp/functions as a demonstration, in the first question has been added to the # number

It's still two ways of thinking.

Vim:

:%[email protected]^#\ ([[: Space:]]\+\) @\[email protected]

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Exit does not save

Sed:

Sed-i-R "s/^#[[:space:]]+//g"/tmp/functions

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

Use the new/tmp/functions as a demo

Copy a new functions to/tmp

Cp/etc/rc.d/init.d/functions/tmp

Vim:

:%[email protected]^[[:space:]]\[email Protected]@g

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Exit does not save

Sed

Sed-i-R "s/^[[:space:]]+//g"/tmp/functions

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

Using/tmp/functions as a demonstration, first remove the # and spaces at the beginning of all lines

Sed-i-R "s/^#[[:space:]]*//g"/tmp/functions

Vim

: 1,[email protected]\ (. *\) @#\[email protected]

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Exit does not save (fan-like highlighting

Sed

Sed-i-R "1,3s/(. *)/#\1/g"/tmp/functions

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

Using/etc/yum.repos.d/fedora.repo to copy to/TMP as a demo

Copying files

Cp/etc/yum.repos.d/fedora.repo/tmp

Vim (17 rows and 28 rows

:%[email protected]\ (enabled=\|gpgcheck=\) [email protected]\[email protected]

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Sed (the delimiter in the original SED is also free to change

Sed-i-R "[email protected] (enabled=|gpgcheck=) [email protected]\[email protected]"/tmp/fedora.repo

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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"

I wrote about Crontab's blog a long while ago, this is the link: http://www.cnblogs.com/divent/p/5743008.html

Create the files needed for backup (folder)

Mkdir/backuptouch/stats/memory.txt

Use CRONTAB-E to open the configuration file and edit

According to the sequence of questions

0 */4 * * */bin/cp-a/etc/backup/etc-$ (date +\%y\%m\%d\%h\%m) 0 0 * * 2,4,6/bin/cp/var/log/messages/backup/messages_l ogs/messages-$ (date +\%y\%m\%d) 0 */2 * * */bin/grep "^s"/proc/meminfo >>/stats/memory.txt# assumed working time Monday to Friday 8-12 14-18 0 8-12/2 * * 1-5/bin/echo "Howdy" 0 14-18/2 * * 1-5/bin/echo "Howdy"

Script Programming Exercises

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

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

Script Name: mage-test

#!/bin/bash# auther:divent# 2016-09-11 19:44:14# mage script Test10-11dirname= "testdir-$ (date +\%y\%m\%d\%h\%m)" mkdir /tmp/$dirnamefor i in {1..100};d otouch/tmp/$dirname/file$idone

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

Ideas :

1) using SED, enter 2 rows at a time, then delete the first row

Sed ' 1~2d '/etc/passwd | Cut-d ":"-F 1

2) Use awk to remove even rows

awk ' nr%2==0 '/etc/passwd | Cut-d ":"-F 1

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3) algorithm, using script, to remove even rows based on algorithm limit (assuming that awk and SED are not used

Script Name: Mage-test2

#!/bin/bash# auther:divent# 2016-09-11 20:08:31# mage script test12# get/etc/passwd's Maximum row maxline=$ (wc-l/etc/passwd | cut -D ""-F 1) # from 1 cycles to maximum line for I in $ (seq 1 $maxline);d o #取余, used to determine n=$[$i%2]if ["$n"-eq "0"];then #如果是偶数, then The number of lines shown in I, using head and tail to display the corresponding line, using cut to cut out the user name echo-e "\n$ (head-n $i/etc/passwd | Tail-n 1 | Cut-d ":"-F 1) "Fidone

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

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

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

Script Name: Mage-test3

#!/bin/bash# auther:divent# 2016-09-11 21:57:43# Mage script Test 13-15# Create a loop of 10 to 19 for I in $ (seq);d o# Create user Useradd "User$i" # Set password echo "User$i" | passwd--stdin "user$i" # Create file touch/tmp/file$i# Modify Permissions Chown "user$i": "User$i"/tmp/file$idone

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This article from "divent" blog, declined reprint!

Sixth week job