Here are the 10 files you will need. 1) \"colors\" red blue green light red ligh

Question

Here are the 10 files you will need.

1) "colors"

red blue green
light red light blue light green
dark green dark red

2) "course_directory"

/courses/it244/f13/ghoffmn

3) "day"

day
I am looking for daylight
night and day
day after day after day

4) "fox"

The quick brown fox
jumped over
the lazy dogs.

5) "hosts"

127.0.0.1   localhost

6) "interfaces"

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

    # The loopback network interface
    auto lo
    iface lo inet loopback

    # The primary network interface
    auto eth0
    iface eth0 inet dhcp

7) "letters_digits"

abcd 1234 5678

8) "new_night"

nite
this is a new line
night
nighty night night
night and day
day and night
all the live long night
night after night after night

9) "night"

nite
night
nighty night night
night and day
day and night
all the live long night
night after night after night

10) "passwd"

root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
sync:x:4:65534:sync:/bin:/bin/sync
man:x:6:12:man:/var/cache/man:/bin/sh
lp:x:7:7:lp:/var/spool/lpd:/bin/sh
mail:x:8:8:mail:/var/mail:/bin/sh
news:x:9:9:news:/var/spool/news:/bin/sh
uucp:x:10:10:uucp:/var/spool/uucp:/bin/sh
proxy:x:13:13:proxy:/bin:/bin/sh
www-data:x:33:33:www-data:/var/www:/bin/sh
backup:x:34:34:backup:/var/backups:/bin/sh
list:x:38:38:Mailing List Manager:/var/list:/bin/sh
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh
libuuid:x:100:101::/var/lib/libuuid:/bin/sh
syslog:x:101:103::/home.ORIG/syslog:/bin/false
mysql:x:102:105:MySQL Server,,,:/nonexistent:/bin/false
messagebus:x:103:106::/var/run/dbus:/bin/false
proxy:x:13:13:proxy:/bin:/bin/sh
www-data:x:33:33:www-data:/var/www:/bin/sh
backup:x:34:34:backup:/var/backups:/bin/sh
list:x:38:38:Mailing List Manager:/var/list:/bin/sh
gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/bin/sh
libuuid:x:100:101::/var/lib/libuuid:/bin/sh
syslog:x:101:103::/home.ORIG/syslog:/bin/false
mysql:x:102:105:MySQL Server,,,:/nonexistent:/bin/false
messagebus:x:103:106::/var/run/dbus:/bin/false
bind:x:105:110::/var/cache/bind:/bin/false
sysadmin:x:1000:1000:sysadmin,,,:/home/sysadmin:/bin/bash

Using sed - Part 2

Each team member must complete this assignment individually in his or her own it341 directory.

This project will not be done on your virtual machine.

Instead, it will be done on users.cs.umb.edu.

When I say "script" in this assignment, I am referring to something very different from the script utility, as used in Assignment #3.

The first line of each script file should be a "shebang" line:

#!/bin/bash

To make file changes in place, use sed with the -i option. Example:

Rather than printing the change to standard output, it will change the file itself.To create a backup when changing a file, specify an extension for the backup file with the -i option. Example:

In addition to changing the file, the new file roses.txt.bak will contain the file's old contents.My grading process will include the following:

Copy pristine file copies into a folder.

Print the text of your script files.

Run the scripts.

Print the text files to verify their contents have changed.

You may see (a variation of) my grading script at the bottom of this page.

For another example, see the file roses_example.pdf

To be sure that these scripts work, you will likely need to run and test them multiple times. Each time, you should download new copies of the text files before testing your scripts.

NOTE: This assignment assumes that you are familiar with the process of writing and running bash scripts.

Log in to users.cs.umb.edu
You will need an ssh client to do this.

Create and go to your it341/assign5 directory:

Copy practice files to this directory

The scripts you will write below will operate on the files you have just copied.Create the script interfaces_update.sh
Write a shell script using sed commands that will make the following modifications to the interfaces file you have just copyChange the line

to read

Add the following after this line

Create the shell script hosts_update.sh
Write a shell script using sed commands that will add the following lines to hosts

Create the shell script passwd_update.sh
Write a shell script using sed commands that will modify the line

so it reads

NOTE: Multiple lines in the passwd file may contain home, but your script should be written so that it is changed ONLY on the line for sysadmin.

Explanation / Answer

interfaces_update.sh

#!/bin/bash

sed -i.bak 's/dhcp/static/' interfaces.txt

sed '$ a network 10.0.0.0' interfaces.txt

sed '$ a address 10.0.0.201' interfaces.txt

sed '$ a gateway 10.0.0.1' interfaces.txt

sed '$ a broadcast 10.0.0.255' interfaces.txt

sed '$ a netmask 255.255.255.0' interfaces.txt

sed '$ a dns-nameservers 10.0.0.1' interfaces.txt

Here, 's/dhcp/static/’ replaces occurrence of ‘dhcp’ with ‘static’. To append lines in the end $ is used followed by ‘a’ which means append which is followed by string to be added.

hosts_update.sh

#!/bin/bash

sed -i.bak -e '$ a # Gateway' interfaces.txt

sed -i.bak -e '$ a   10.0.0.1    it20.it.cs.umb.edu it20' hosts.txt

sed -i.bak -e '$ a ' hosts.txt                            # inserts blank line

sed -i.bak -e '$ a # Addresses for the Windows PCs ' hosts.txt

sed -i.bak -e '$ a 10.0.0.240 it21.it.cs.umb.edu it21' hosts.txt

sed -i.bak -e '$ a 10.0.0.241 it22.it.cs.umb.edu it22' hosts.txt

sed -i.bak -e '$ a 10.0.0.242 it23.it.cs.umb.edu it23' hosts.txt

sed -i.bak -e '$ a 10.0.0.243 it24.it.cs.umb.edu it24' hosts.txt

sed -i.bak -e '$ a 10.0.0.244 it25.it.cs.umb.edu it25' hosts.txt

sed -i.bak -e '$ a 10.0.0.245 it26.it.cs.umb.edu it26' hosts.txt

sed -i.bak -e '$ a   10.0.0.246 it27.it.cs.umb.edu it27' hosts.txt

sed -i.bak -e '$ a 10.0.0.247 it28.it.cs.umb.edu it28' hosts.txt

passwd_update.sh

#!/bin/bash

sed -i.bak -e 's/sysadmin:x:1000:1000:sysadmin,,,:/home/sysadmin:/bin/bash/sysadmin:x:1000:1000:sysadmin,,,:/home.it20/sysadmin:/bin/bash' passwd.txt

‘s/old/new’ if old and new itself contain ‘/’ then each / should escaped by .

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