NT1430 Linux Administration LAB 4 vi -- again

On your linux server enter the following in the command line: root@servername: cd /opt root@servername: ls -la 1) Write what files exist in your directory.

root@servername: touch sysinfo root@servername: ls -la 2) Write what files exist in your directory.

3) What are the permissions on the file you have just created?

root@servername: chmod 755 sysinfo root@servername: ls -la 4) What are the permissions on the file you have just created?

5) What have you just done?

Practical
Mysystem
root@servername: vi mysystem Now to enter into insert mode (edit mode) hit [i] to exit back into command mode hit [Esc] Now while you are in INSERT MODE type the following, be careful of all characters and typos.
#!/bin/bash clear printf "This is information provided by mysystem.sh. Program starts now.\n" printf "Hello, $USER.\n\n" printf "Today's date is `date`, this is week `date +"%V"`.\n\n" printf "These users are currently connected:\n" w | cut -d " " -f 1 - | grep -v USER | sort -u printf "\n" printf "This is `uname -s` running on a `uname -m` processor.\n\n" printf "This is the uptime information:\n" uptime printf "\n" printf "That's all folks!\n"

To end and save the file enter the following: [Esc] [:] You will exit Insert Mode and enter into Command Mode then save and exit vi: wq [Enter] Now run the script. root@servername: chmod 755 mysystem root@servername: ./mysystem Print a screen shot of the results.

sysinfo root@servername: vi sysinfo Now to enter into insert mode (edit mode) hit [i] to exit back into command mode hit [Esc] Now while you are in INSERT MODE type the following, be careful of all characters and typos.
#!/bin/sh #requires the following # free, hostname, grep, cut, awk, uname HOSTNAME=`hostname -s` IP_ADDRS=`ifconfig | grep 'inet addr' | grep -v '255.0.0.0' | cut -f2 -d':' | awk '{print $1}'` IP_ADDRS=`echo $IP_ADDRS | sed 's/\n//g'` #memory MEMORY=`free | grep Mem | awk '{print $2}'` #cpu info CPUS=`cat /proc/cpuinfo | grep processor | wc -l | awk '{print $1}'` CPU_MHZ=`cat /proc/cpuinfo | grep MHz | tail -n1 | awk '{print $4}'` CPU_TYPE=`cat /proc/cpuinfo | grep vendor_id | tail -n 1 | awk '{print $3}'` CPU_TYPE2=`uname -m` OS_NAME=`uname -s` OS_KERNEL=`uname -r` BOOT=`procinfo | grep Bootup | sed 's/Bootup: //g' | cut -f1-6 -d' '` UPTIME=`uptime | cut -f5-8 -d' '` PCIINFO=`lspci | cut -f3 -d':'` #Another way to do it #PCIINFO=`lspci | cut -f3 -d':'` #print it out echo "$HOSTNAME" echo "----------------------------------" echo "Hostname : $HOSTNAME" echo "Host Address(es) : $IP_ADDRS" echo "Main Memory : $MEMORY" echo "Number of CPUs : $CPUS" echo "CPU Type : $CPU_TYPE $CPU_TYPE2 $CPU_MHZ MHz" echo "OS Name : $OS_NAME" echo "Kernel Version : $OS_KERNEL" echo "Bootup : $BOOT - Uptime $UPTIME" echo echo "Devices" echo "----------------------------------" echo "$PCIINFO"

To end and save the file enter the following: [Esc] [:] You will exit Insert Mode and enter into Command Mode then save and exit vi: wq [Enter] Now run the script. root@servername: ./sysinfo Print a screen shot of the results.

Hangman. root@servername: touch hangman Change the permissions of the file to Read/Write/Execute for the owner, and Read/Execute for all others. (Fill in the blank) root@servername: chmod _ _ _ hangman root@servername: ls -la What are the results for the file hangman?

root@servername: vi hangman Enter the following:
#!/bin/sh # guessword - a simple word guessing game a la hangman blank=".................." # must be longer than longest word getword() { case $(( $$ % 8 )) in 0 ) echo "pizzazz" 2 ) echo "gargantuan" 4 ) echo "paparazzi" 6 ) echo "zither" esac }

;; ;; ;; ;;

1 ) echo "delicious" ;; 3 ) echo "minaret" ;; 5 ) echo "delinquent" ;; 7 ) echo "cuisine" ;;

addLetterToWord() { # This function replaces all '.' in template with guess # then updates remaining to be the number of empty slots left letter=1 while [ $letter -le $letters ] ; do if [ "$(echo $word | cut -c$letter)" = "$guess" ] ; then before="$(( $letter - 1 ))"; after="$(( $letter + 1 ))" if [ $before -gt 0 ] ; then tbefore="$(echo $template | cut -c1-$before)" else tbefore="" fi if [ $after -gt $letters ] ; then template="$tbefore$guess" else template="$tbefore$guess$(echo $template | cut -c$after-$letters)" fi fi letter=$(( $letter + 1 )) done remaining=$(echo $template|sed 's/[^\.]//g'|wc -c|sed 's/[[:space:]]//g')

remaining=$(( $remaining - 1 )) }

# fix to ignore '\n'

word=$(getword) letters=$(echo $word | wc -c | sed 's/[[:space:]]//g') letters=$(( $letters - 1 )) # fix character count to ignore \n template="$(echo $blank | cut -c1-$letters)" remaining=$letters ; guessed="" ; guesses=0; badguesses=0 echo "** You're trying to guess a word with $letters letters **" while [ $remaining -gt 0 ] ; do echo -n "Word is: $template Try what letter next? " ; read guess guesses=$(( $guesses + 1 )) if echo $guessed | grep -i $guess > /dev/null ; then echo "You've already guessed that letter. Try again!" elif ! echo $word | grep -i $guess > /dev/null ; then echo "Sorry, the letter \"$guess\" is not in the word." guessed="$guessed$guess" badguesses=$(( $badguesses + 1 )) else echo "Good going! The letter $guess is in the word!" addLetterToWord $guess fi done echo -n "Congratulations! You guessed $word in $guesses guesses" echo " with $badguesses bad guesses" exit 0

Save and execute the file. Enter the steps to save the file:

Explain the steps to execute the file:

wifi.
Detail the steps to create this script.
#!/bin/bash #removing possible previous temp file rm list.temp 2>/dev/null #scans for wifi connections & isolates wifi AP name eval list=( $(sudo iwlist scan 2>/dev/null | awk -F":" '/ESSID/{print $2}') ) #sets prompt PS3="Choose wifi connection: " #tests for number of wifi connections, exits if none if [ -z "${list[0]}" ]; then clear echo "No available wifi connection" exit 1 fi #menu of wifi connections select item in "${list[@]}"; do #sets essid as value for WIFI variable and displays information about the AP wifi=$(echo $item) sudo iwlist scan 2>/dev/null | sed -n "/$wifi/, +9p" > list.temp echo "$(cat list.temp | sed 's/^[ \t]*//')" #sets channel as value for CHANNEL variable channel=$(grep Channel: list.temp | sed 's/.*Channel://g') #test for mode, if mode = master, sets MODE variable to managed mode=$(grep Mode list.temp | sed 's/.*Mode://g') if [ "$mode" == "Master" ]; then mode="managed" else clear echo "Cannot connect" exit fi #tests for encryption key key=$(grep key: list.temp | sed 's/.*key://g') if [ $key == "on" ]; then echo -n "Enter encryption key: " read key fi #checks encryption algorithm IE=$(grep IE list.temp | sed 's/^ .*IE: \(...\).*/\1/') #writes to /etc/network/interfaces file for WPA encryption: essid, key, protocols, etc. if [ "$IE" == "WPA" ]; then sudo cp /etc/network/interfaces /etc/network/interfaces.bakup sudo sed -i 's/iface wlan0 inet manual/iface wlan0 inet dhcp/' /etc/network/interfaces sudo sed -i -e "/dhcp/a\wpa-passphrase $key" \ -e "/dhcp/a\wpa-driver wext" \ -e "/dhcp/a\wpa-key-mgmt WPA-PSK" \ -e "/dhcp/a\wpa-proto WPA" \ -e "/dhcp/a\wpa-ssid \"$wifi\"" /etc/network/interfaces sudo /etc/init.d/networking restart sudo cp /etc/network/interfaces.bakup /etc/network/interfaces sudo rm /etc/network/interfaces.bakup exit else #sets the wireless configuration for non WPA: essid, channel, mode, key, etc sudo iwconfig wlan0 essid \""$wifi"\" channel $channel mode $mode key $key

echo "------------------------------------------------" echo "Connecting to: $wifi at channel: $channel, mode: $mode" echo "------------------------------------------------" #connects to wifi connection sudo dhclient exit fi done

user information.
Detail the steps to create this script.
#!/bin/bash if [ "$1" = "" ] then echo echo "Usage: $0 USERNAME" echo echo "Example: $0 kam" echo exit 1 fi Username=`cat /etc/passwd | grep -Ew ^$1 | cut -d":" -f1` if [ "$Username" = "" ] then echo "Username $1 doesn't exist" exit 2 fi Userid=`cat /etc/passwd | grep -Ew ^$Username | cut -d":" -f3` UserPrimaryGroupId=`cat /etc/passwd | grep -Ew ^$Username | cut -d":" -f4` UserPrimaryGroup=`cat /etc/group | grep :"$UserPrimaryGroupId": | cut -d":" -f1` UserInfo=`cat /etc/passwd | grep -Ew ^$Username | cut -d":" -f5` UserHomeDir=`cat /etc/passwd | grep -Ew ^$Username | cut -d":" -f6` UserShell=`cat /etc/passwd | grep -Ew ^$Username | cut -d":" -f7` UserGroups=`groups $Username | awk -F": " '{print $2}'` PasswordExpiryDate=`chage -l $Username | grep "Password expires" | awk -F": " '{print $2}'` LastPasswordChangeDate=`chage -l $Username | grep "Last password change" | awk -F": " '{print $2}'` AccountExpiryDate=`chage -l $Username | grep "Account expires" | awk -F": " '{print $2}'` HomeDirSize=`du -hs $UserHomeDir | awk '{print $1}'` echo printf "%-25s : %5s [User Id - %s]\n" "Username" "$Username" "$Userid" printf "%-25s : %5s\n" "User Info" "$UserInfo" echo printf "%-25s : %5s [Group Id - %s]\n" "User's Primary Group" "$UserPrimaryGroup" "$UserPrimaryGroupId" printf "%-25s : %5s\n" "User is Member of Groups" "$UserGroups" echo printf "%-25s : %5s [Size Occupied - %s]\n" "Home Directory" "$UserHomeDir" "$HomeDirSize" printf "%-25s : %5s\n" "Default Shell" "$UserShell" echo printf "%-25s : %5s\n" "Last Password Changed On" "$LastPasswordChangeDate" printf "%-25s : %5s\n" "Password Expiry Date" "$PasswordExpiryDate" printf "%-25s : %5s\n" "Account Expiry Date" "$AccountExpiryDate" echo