JAVA-20220 Added suffix -modules to aws-lambda, clojure, terraform, linux-bash

linux-bash-modules/command-line-arguments/src/main/bash/README.md

@@ -0,0 +1,4 @@
+### Relevant Articles:
+
+- [How to Use Command Line Arguments in a Bash Script](https://www.baeldung.com/linux/use-command-line-arguments-in-bash-script)
+- [Concatenate Two Strings to Build a Complete Path in Linux](https://www.baeldung.com/linux/concatenate-strings-to-build-path)

linux-bash-modules/command-line-arguments/src/main/bash/userReg-flags.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+while getopts u:a:f: flag
+do
+case "${flag}"
+in
+u) username=${OPTARG};;
+a) age=${OPTARG};;
+f) fullname=${OPTARG};;
+esac
+done
+echo "Username: $username";
+echo "Age: $age";
+echo "Full Name: $fullname";

linux-bash-modules/command-line-arguments/src/main/bash/userReg-positional-parameter.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+echo "Username: $1"; 
+echo "Age: $2"; 
+echo "Full Name: $3";

linux-bash-modules/command-line-arguments/src/main/bash/users-loop.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+i=1;
+for user in "$@"
+do
+echo "Username - $i: $user";
+i=$((i + 1));
+done

linux-bash-modules/command-line-arguments/src/main/bash/users-shift-operator.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+i=1;
+j=$#;
+while [ $i -le $j ]
+do
+echo "Username - $i: $1";
+i=$((i + 1));
+shift 1;
+done

linux-bash-modules/functions/src/main/bash/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles
+
+- [Bash Functions in Linux](https://www.baeldung.com/linux/bash-functions)

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

@@ -0,0 +1,208 @@
+#!/bin/bash
+
+# Subsection 2.1
+simple_function() {
+    for ((i=0;i<5;++i)) do
+        echo -n " "$i" ";
+    done
+}
+
+function simple_function_no_parantheses {
+    for ((i=0;i<5;++i)) do
+        echo -n " "$i" ";
+    done
+}
+
+function simple_for_loop()
+    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
+
+# Subsection 2.2
+function simple_inputs() {
+    echo "This is the first argument [$1]"
+    echo "This is the second argument [$2]"
+    echo "Calling function with $# aruments"
+}
+
+# Subsection 2.3
+global_sum=0
+function global_sum_outputs() {
+    global_sum=$(($1+$2)) 
+}
+
+function cs_sum_outputs() {
+    sum=$(($1+$2))
+    echo $sum
+}
+
+# Subsection 2.4
+function arg_ref_sum_outputs() {
+    declare -n sum_ref=$3
+    sum_ref=$(($1+$2)) 
+}
+
+# Subsection 3.1
+variable="baeldung"
+function variable_scope2() {
+    echo "Variable inside function variable_scope2: [$variable]"
+    local variable="ipsum"
+}
+
+function variable_scope() {
+    local variable="lorem"
+    echo "Variable inside function variable_scope: [$variable]"
+    variable_scope2
+}
+
+# Subsection 3.2
+subshell_sum=0
+function simple_subshell_sum() (
+    subshell_sum=$(($1+$2))
+    echo "Value of sum in function with global variables: [$subshell_sum]"
+)
+
+function simple_subshell_ref_sum() (
+    declare -n sum_ref=$3
+    sum_ref=$(($1+$2))
+    echo "Value of sum in function with ref arguments: [$sum_ref]"
+)
+
+# Subsection 3.3
+function redirection_in() {
+    while read input;
+        do
+            echo "$input"
+        done
+} < infile
+
+function redirection_in_ps() {
+    read
+    while read -a input;
+        do
+            echo "User[${input[2]}]->File[${input[8]}]"
+        done
+} < <(ls -ll /)
+
+function redirection_out_ps() {
+    declare -a output=("baeldung" "lorem" "ipsum" "caracg")
+    for element in "${output[@]}"
+        do
+            echo "$element"
+        done
+} > >(grep "g")
+
+function redirection_out() {
+    declare -a output=("baeldung" "lorem" "ipsum")
+    for element in "${output[@]}"
+        do
+            echo "$element"
+        done
+} > outfile
+
+# Subsection 3.4
+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 + $second ))
+    fi 
+}
+
+# main menu entry point
+echo "****Functions samples menu*****"
+PS3="Your choice (1,2,3 etc.):"
+options=("function_definitions" "function_input_args" "function_outputs" \
+         "function_variables" "function_subshells" "function_redirections" \
+         "function_recursion" "quit")
+select option in "${options[@]}"
+do
+    case $option in
+        "function_definitions")
+            echo -e "\n"
+            echo "**Different ways to define a function**"
+            echo -e "No function keyword:"
+            simple_function
+            echo -e "\nNo function parantheses:"
+            simple_function_no_parantheses
+            echo -e "\nOmitting curly braces:"
+            simple_for_loop
+            echo -e "\n"
+            ;;
+        "function_input_args")
+            echo -e "\n"
+            echo "**Passing inputs to a function**"
+            simple_inputs lorem ipsum
+            echo -e "\n"
+            ;;
+        "function_outputs")
+            echo -e "\n"
+            echo "**Getting outputs from a function**"
+            global_sum_outputs 1 2
+            echo -e ">1+2 using global variables: [$global_sum]"
+            cs_sum=$(cs_sum_outputs 1 2)
+            echo -e ">1+2 using command substitution: [$cs_sum]"
+            arg_ref_sum_outputs 1 2 arg_ref_sum
+            echo -e ">1+2 using argument references: [$arg_ref_sum]"
+            echo -e "\n"
+            ;;
+        "function_variables")
+            echo -e "\n"
+            echo "**Overriding variable scopes**"
+            echo "Global value of variable: [$variable]"
+            variable_scope
+            echo -e "\n"
+            ;;
+        "function_subshells")
+            echo -e "\n"
+            echo "**Running function in subshell**"
+            echo "Global value of sum: [$subshell_sum]"
+            simple_subshell_sum 1 2
+            echo "Value of sum after subshell function with \
+global variables: [$subshell_sum]"
+            subshell_sum_arg_ref=0
+            simple_subshell_ref_sum 1 2 subshell_sum_arg_ref
+            echo "Value of sum after subshell function with \
+ref arguments: [$subshell_sum_arg_ref]"
+            echo -e "\n"
+            ;;
+        "function_redirections")
+            echo -e "\n"
+            echo "**Function redirections**"
+            echo -e ">Function input redirection from file:"
+            redirection_in
+            echo -e ">Function input redirection from command:"
+            redirection_in_ps
+            echo -e ">Function output redirection to file:"
+            redirection_out
+            cat outfile
+            echo -e ">Function output redirection to command:"
+            red_ps=$(redirection_out_ps)
+            echo "$red_ps"
+            echo -e "\n"
+            ;;
+        "function_recursion")
+            echo -e "\n"
+            echo "**Function recursion**"
+            fibo_res1=$(fibonnaci_recursion 7)
+            echo "The 7th Fibonnaci number: [$fibo_res1]"
+            fibo_res2=$(fibonnaci_recursion 15)
+            echo "The 15th Fibonnaci number: [$fibo_res2]"
+            echo -e "\n"
+            ;;
+        "quit")
+            break
+            ;;
+        *) echo "Invalid option";;
+    esac
+done

linux-bash-modules/functions/src/main/bash/infile

@@ -0,0 +1,3 @@
+Honda  Insight  2010
+Honda  Element  2006
+Chevrolet  Avalanche  2002

linux-bash-modules/json/README.md

@@ -0,0 +1,2 @@
+### Relevant Articles:
+- [Guide to Linux jq Command for JSON Processing](https://www.baeldung.com/linux/jq-command-json)

linux-bash-modules/json/src/main/bash/fruit.json

@@ -0,0 +1 @@
+{"fruit":{"name":"apple","color":"green","price":1.20}}

linux-bash-modules/json/src/main/bash/fruits.json

@@ -0,0 +1,17 @@
+[
+  {
+    "name": "apple",
+    "color": "green",
+    "price": 1.2
+  },
+  {
+    "name": "banana",
+    "color": "yellow",
+    "price": 0.5
+  },
+  {
+    "name": "kiwi",
+    "color": "green",
+    "price": 1.25
+  }
+] 

linux-bash-modules/json/src/main/bash/jq.sh

@@ -0,0 +1,56 @@
+#!/bin/bash
+
+#3.1. Beautify JSON
+echo '{"fruit":{"name":"apple","color":"green","price":1.20}}' | jq '.'
+jq '.' fruit.json
+curl http://api.open-notify.org/iss-now.json | jq '.'
+
+#3.2. Accessing Properties
+jq '.fruit' fruit.json
+jq '.fruit.color' fruit.json
+jq '.fruit.color,.fruit.price' fruit.json
+echo '{ "with space": "hello" }' | jq '."with space"'
+
+#4.1. Iteration
+echo '["x","y","z"]' | jq '.[]'
+jq '.[] | .name' fruits.json
+jq '.[].name' fruits.json
+
+#4.2. Accessing By Index
+jq '.[1].price' fruits.json
+
+#4.3. Slicing
+echo '[1,2,3,4,5,6,7,8,9,10]' | jq '.[6:9]'
+echo '[1,2,3,4,5,6,7,8,9,10]' | jq '.[:6]' | jq '.[-2:]'
+
+#5.1. Getting Keys
+jq '.fruit | keys' fruit.json
+
+#5.2. Returning the Length
+jq '.fruit | length' fruit.json
+jq '.fruit.name | length' fruit.json
+
+#5.3. Mapping Values
+jq 'map(has("name"))' fruits.json
+jq 'map(.price+2)' fruits.json
+
+#5.4. Min and Max
+jq '[.[].price] | min' fruits.json
+jq '[.[].price] | max' fruits.json
+
+#5.5. Selecting Values
+jq '.[] | select(.price>0.5)' fruits.json
+jq '.[] | select(.color=="yellow")' fruits.json
+jq '.[] | select(.color=="yellow" and .price>=0.5)' fruits.json
+
+#5.6. Support For RegEx
+jq '.[] | select(.name|test("^a.")) | .price' fruits.json
+
+#5.7. Find Unique Values
+jq 'map(.color) | unique' fruits.json
+
+#5.8. Deleting Keys From JSON
+jq 'del(.fruit.name)' fruit.json
+
+# 6. Transforming
+jq '.query.pages | [.[] | map(.) | .[] | {page_title: .title, page_description: .extract}]' wikipedia.json

linux-bash-modules/json/src/main/bash/wikipedia.json

@@ -0,0 +1,22 @@
+{
+  "query": {
+    "pages": [
+      {
+        "21721040": {
+          "pageid": 21721040,
+          "ns": 0,
+          "title": "Stack Overflow",
+          "extract": "Some interesting text about Stack Overflow"
+        }
+      },
+      {
+        "21721041": {
+          "pageid": 21721041,
+          "ns": 0,
+          "title": "Baeldung",
+          "extract": "A great place to learn about Java"
+        }
+      }
+    ]
+  }
+}

linux-bash-modules/loops/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Linux Commands – Looping Through Directories](https://www.baeldung.com/linux/loop-directories)

linux-bash-modules/loops/src/main/bash/find_directories.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+find . -maxdepth 1 -mindepth 1 -type d -printf '%f\n'
+
+find . -maxdepth 1 -mindepth 1 -type d | while read dir; do
+  echo "$dir"
+done
+
+find . -maxdepth 1 -type d -exec echo {} \;

linux-bash-modules/loops/src/main/bash/loop_directories.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+for dir in */; do
+    echo "$dir"
+done
+
+for file in *; do
+    if [ -d "$file" ]; then
+        echo "$file"
+    fi
+done

linux-bash-modules/read/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Guide to the Linux read Command](https://www.baeldung.com/linux/read-command)

linux-bash-modules/read/src/main/bash/file.csv

@@ -0,0 +1 @@
+car,car model,car year,car vin;Mercury,Grand Marquis,2000,2G61S5S33F9986032;Mitsubishi,Truck,1995,SCFFDABE1CG137362;Ford,Mustang,1968,2G4WS55J351278031;Ford,Crown Victoria,1996,4T1BK1EB8EU586249;GMC,Envoy,2004,WVGEF9BP3FD720618;

linux-bash-modules/read/src/main/bash/read_inputs.sh

@@ -0,0 +1,122 @@
+#!/bin/bash
+
+# section 2.1
+default_read(){
+    read input1 input2 input3
+    echo "[$input1] [$input2] [$input3]"
+}
+
+# section 2.2
+custom_ifs_no_array(){
+    OLDIFS=$IFS
+    IFS=";"
+    read input1 input2 input3
+    echo "[$input1] [$input2] [$input3]"
+    # restore default IFS after we're finished so current shell behaves like before
+    IFS=$OLDIFS
+}
+
+# Section 2.3
+prompt_read_password(){
+    prompt="You shall not pass:"
+    read -p "$prompt" -s input
+    echo -e "\ninput password [$input]"
+}
+
+array_read(){
+    declare -a input_array
+    text="baeldung is a cool tech site"
+    read -e -i "$text" -a input_array 
+    for input in ${input_array[@]} 
+        do
+            echo " word [$input]"
+        done
+}
+
+# section 3.1
+file_read(){
+    exec {file_descriptor}<"./file.csv"
+    declare -a input_array
+    delimiter=";"
+    while IFS="," read -a input_array -d $delimiter -u $file_descriptor 
+        do
+            echo "${input_array[0]},${input_array[2]}" 
+        done
+    exec {file_descriptor}>&-
+}
+
+# section 3.2
+command_pipe(){
+    ls -ll / | { declare -a input
+               read
+               while read -a input; 
+               do
+                   echo "${input[0]} ${input[8]}"
+               done }
+}
+
+# section 3.3
+timeout_input_read(){
+    prompt="You shall not pass:"
+    read -p "$prompt" -s -r -t 5 input
+        if [ -z "$input" ]; then
+            echo -e "\ntimeout occured!"
+        else
+            echo -e "\ninput word [$input]"
+        fi
+}
+
+exactly_n_read(){
+    prompt="Reading exactly 11 chars:"
+    read -p "$prompt" -N 11 -t 5 input1 input2 
+    echo -e "\ninput word1 [$input1]"
+    echo "input word2 [$input2]"
+}
+
+# main menu entry point
+echo "****Read command samples menu*****"
+PS3="Your choice (1,2,3 etc.):"
+options=("default_read" "custom_ifs_no_array" "prompt_read_password" \
+         "array_read" "file_read" "command_pipe" "timeout_input_read" \
+         "exactly_n_read" "quit")
+select option in "${options[@]}"
+do
+  case $option in
+        "default_read")
+            echo "Enter something separated by spaces"
+            default_read
+            ;;
+        "custom_ifs_no_array")  
+            echo "Enter something separated by ;"
+            custom_ifs_no_array
+            ;;
+        "prompt_read_password")
+            echo "Enter an invisible password after the prompt"
+            prompt_read_password
+            ;;
+        "array_read")
+            echo "Enter something else or just return"
+            array_read
+            ;;
+        "file_read")
+            echo "Reading from one liner csv file"
+            file_read
+            ;;
+        "command_pipe")
+            echo "Listing files and access rights from /"
+            command_pipe
+            ;;
+        "timeout_input_read")
+            echo "Enter something in 5 seconds or less"
+            timeout_input_read
+            ;;
+        "exactly_n_read")
+            echo "Enter at least 11 characters or wait 5 seconds"
+            exactly_n_read
+            ;;
+        "quit")
+            break
+            ;;
+        *) echo "Invalid option";;
+  esac
+done

linux-bash-modules/text/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles:
+
+- [Linux Commands for Appending Multiple Lines to a File](https://www.baeldung.com/linux/appending-multiple-lines-to-file2)

linux-bash-modules/text/src/main/bash/append_multiple_lines.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+# echo per line
+echo Lorem ipsum dolor sit amet, consectetur adipiscing elit, >> echo-per-line.txt
+echo sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. >> echo-per-line.txt
+
+# echo with escaped newline
+echo -e Lorem ipsum dolor sit amet, consectetur adipiscing elit,\\nsed do eiusmod tempor incididunt ut labore et dolore magna aliqua. >> echo-escaped-newline.txt
+
+# echo with double quoted string
+echo -e "Lorem ipsum dolor sit amet, consectetur adipiscing elit,\nsed do eiusmod tempor incididunt ut labore et dolore magna aliqua." >> echo-double-quoted.txt
+
+# printf instead of echo
+printf "Lorem ipsum dolor sit amet, consectetur adipiscing elit,\nsed do eiusmod tempor incididunt ut labore et dolore magna aliqua." >> printf.txt
+
+# printf using format string
+printf "%s\n%s" "Lorem ipsum dolor sit amet, consectetur adipiscing elit," "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua." >> printf-format.txt
+
+# cat
+cat << EOF >> cat.txt
+Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+EOF
+
+# tee
+tee -a tee.txt << EOF
+Lorem ipsum dolor sit amet, consectetur adipiscing elit,
+sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
+EOF
+

linux-bash-modules/text/src/main/bash/remove_characters.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+my_var="Hola Mundo"
+echo ${my_var}
+
+my_filename="interesting-text-file.txt"
+echo ${my_filename:0:21}
+
+echo ${my_filename%.*}
+
+complicated_filename="hello-world.tar.gz"
+echo ${complicated_filename%%.*}
+
+echo ${my_filename/.*/}
+
+echo 'interesting-text-file.txt' | sed 's/.txt*//'
+
+echo 'interesting-text-file.txt' | cut -f1 -d"."
+echo ${complicated_filename} | cut -f1 -d"."