BAEL-3451: First samples

linux-bash/functions/src/main/bash/functions.sh

@@ -0,0 +1,72 @@
+#!/bin/bash
+
+
+# simple input and output
+# variable shadowing
+# nesting and recursion
+
+
+function simple_inputs() {
+    echo "This is the first argument [$1]"
+    echo "This is the second argument [$2]"
+    echo "Calling function with $# aruments"
+}
+
+global_variable="lorem"
+function simple_outputs() {
+    sum=$(($1+$2)) 
+    echo "Sum is $sum"
+    global_variable="dolor"
+    # this is just the status code
+    # does not work if we want to return 
+    # other than numerical 
+    return $sum
+}
+
+# missing brackets still works
+# as long as we have compound commands
+function simple_for_loop()
+    # echo "Looping through numbers"
+    for ((i=0;i<5;++i)) do
+        echo -n " "$i;
+    done
+
+function simple_comparison()
+    if [[ "$1" -lt 5 ]]; then
+        echo "$1 is smaller than 5"
+    else
+        echo "$1 is greater than 5"
+    fi
+
+# command groups with subshells 
+# with the limitation of new enviornments
+function simple_subshell()
+    (
+        echo "I'm a little tea pot"
+        simple_comparison 10
+        cd ..
+        global_variable="ipsum"
+    )
+
+function fibonnaci_recursion() {
+    argument=$1
+    if [[ "$argument" -eq 0 ]] || [[ "$argument" -eq 1 ]]; then
+        echo $argument
+    else
+        first=$(fibonnaci_recursion $(($argument-1)))
+        second=$(fibonnaci_recursion $(($argument-2)))
+        echo $(( $first + $second ))
+    fi 
+}
+
+
+
+simple_inputs one two three
+simple_outputs 1 2
+simple_for_loop
+simple_comparison 6
+simple_comparison 4
+simple_subshell
+echo $global_variable
+
+#echo $(fibonnaci_recursion 7)