Add new file

Waleed_HomeWork

+script 1
+#!/bin/bash
+
+currentdi=$(pwd)
+
+for item in "$currentdi"/**/*.txt; do
+    if [[ -f "$item" ]]; then
+        sed -i 's/oldworld/newworld/g' "$item"
+    fi
+done
+
+
+
+========================================================================================
+script 2
+
+#!/bin/bash
+
+
+new_folder="$HOME/new_folder"
+mkdir -p "$new_folder"
+
+for l in {a..z}; do
+    for n in {1..10}; do
+        filename="file${n}_${l}"
+        touch "$new_folder/$filename"
+    done
+done
+
+for file in "$new_folder"/*_x; do
+    echo "Hello Linux" > "$file"
+done
+
+for l in {a..z}; do
+    folder="$new_folder/$l"
+    mkdir -p "$folder"
+    mv "$new_folder"/*_$l "$folder"
+done
+
+find "$new_folder" -type f \( -name "*3*" -o -name "*4*" \) -delete
+
+========================================================================================
+script 3
+
+#!/bin/bash
+# alive2.sh
+
+stIp=$(echo "$1" | cut -d- -f1)
+endIp=$(echo "$1" | cut -d- -f2)
+
+network_prefix=$(echo "$stIp" | cut -d. -f1-3)
+
+stRange=$(echo "$stIp" | cut -d. -f4)
+endRange=$(echo "$endIp" | cut -d. -f4)
+
+if (( endRange >= stRange )); then
+    for ((n=stRange; n<=endRange; n++)); do
+        host="$network_prefix.$n"
+        ping -c2 "$host" &> /dev/null
+        if [ $? = 0 ]; then
+            echo "$host is UP"
+        else
+            echo "$host is DOWN"
+        fi
+    done
+else
+    echo "The end range is smaller than the start range."
+fi