final project commit

final-project-script.sh

@@ -1,2 +1,118 @@
 #!/bin/bash
 
+# JARVIS is an all-in-one tool to easily administer your Linux machine.
+# This tool is very simple and modular, you can add your own functions
+# so you don't need to remember all the commands and parameters.
+
+###HELP FUNCTION
+showhelp(){
+cat << EOF
+*****************************************************
+Hello commander, these are the arguments you can use:
+-----------------------------------------------------
+
+help        -> Shows this help message
+ip          -> Display the ip address of this machine
+hostname    -> Display the hostname of this machine
+uptime      -> Display how long this machine has been running.
+datetime    -> Display the time and date
+replacewords-> Replace words in a file
+readelement -> Read the nth element of a text file
+
+-----------------------------------------------------
+*****************************************************
+EOF
+}
+
+##SHOW IP ADDRESS FUNCTION
+showip(){
+echo "This machine's IP address is:"
+hostname -I
+}
+
+##SHOW HOSTNAME FUNCTION
+showhost(){
+echo "This machines hostname is:"
+cat /etc/hostname
+}
+
+##SHOW UPTIME FUNCTION
+showuptime(){
+up=$(uptime -p | cut -c4-)
+since=$(uptime -s)
+cat << EOF
+----------
+This machine has been up for ${up}
+
+It has been running since ${since}
+----------
+EOF
+}
+
+showdatetime(){
+    TZ='Europe/Brussels' date "+Current day: %d-%m-%y Current time: %H:%M:%S"
+}
+
+replacewords(){
+    echo "Please the file you want to change words for."
+    read file
+    echo "What word do you want to change?"
+    read word1
+    echo "What do you want the word to be?"
+    read word2
+    echo "Do you want a backup of the original file?"
+    while true; do
+        read -p "Do you want to create a backup?" backup
+        case $backup in
+            [Yy]* ) backupmode="-i.backup"; break;;
+            [Nn]* ) backupmode="";;
+        esac
+    done
+    sed $backupmode "s/$word1/$word2/g" $file
+}
+
+readelement(){
+    re='^[0-9]+$'
+    read -p "What file would you like to read from?" file
+    wordcount=$(wc -w < $file)
+    while true; do
+        read -p "There are $wordcount words in this file. Enter a number between 1 and $wordcount to read a word." position
+        if ! [[ $position =~ $re ]]
+        then
+            echo "That's not a number!"
+        elif [ $position -gt $wordcount ]
+        then
+            echo "There aren't that many words in this file."
+        else
+            awk -v x=$position '{print $x}' $file
+            break
+        fi
+    done
+}
+
+case $1 in
+    "help")
+    showhelp
+    ;;
+    "ip")
+    showip
+    ;;
+    "hostname")
+    showhost
+    ;;
+    "uptime")
+    showuptime
+    ;;
+    "datetime")
+    showdatetime
+    ;;
+    "replacewords")
+    replacewords
+    ;;
+    "readelement")
+    readelement
+    ;;
+    *)
+    showhelp
+    ;;
+esac

hellothere.txt

@@ -0,0 +1 @@
+Hello there mister

hellothere.txt.backup

@@ -0,0 +1 @@
+Hello there mister

hithere.txt

@@ -0,0 +1 @@
+Hi there

hithere.txt.backup

@@ -0,0 +1 @@
+Hi there