Conditional Statements

1. if** Statements**:

   if [ condition ]; then
       # Commands
   elif [ another_condition ]; then
       # Commands
   else
       # Commands
   fi

2. Examples:

   • Check if a file exists:

     if [ -f file.txt ]; then
         echo "File exists."
     else
         echo "File does not exist."
     fi

Loops

1. for** Loop**:

   for item in list; do
       # Commands
   done

   • Example:

     for file in *.txt; do
         echo for Loop:
     
     for item in list; do
         # Commands
     done
     
     Exam"Processing $file"
     done

2. while** Loop**:

   while [ condition ]; do
       # Commands
   done

   • Example:

     count=1
     while [ $count -le 5 ]; do
         echo "Count: $count"
         count=$((count + 1))
     done

3. until** Loop**:

   until [ condition ]; do
       # Commands
   done