Merge pull request #8513 from srzamfir/feature/BAEL-3451_bash_functions
Feature/bael 3451 bash functions
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Eric Martin
GitHub
commit
1abef2a717
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#!/bin/bash
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# Subsection 2.1
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simple_function() {
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for ((i=0;i<5;++i)) do
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echo -n " "$i" ";
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done
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}
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function simple_function_no_parantheses {
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for ((i=0;i<5;++i)) do
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echo -n " "$i" ";
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done
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}
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function simple_for_loop()
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for ((i=0;i<5;++i)) do
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echo -n " "$i" ";
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done
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function simple_comparison()
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if [[ "$1" -lt 5 ]]; then
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echo "$1 is smaller than 5"
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else
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echo "$1 is greater than 5"
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fi
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# Subsection 2.2
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function simple_inputs() {
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echo "This is the first argument [$1]"
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echo "This is the second argument [$2]"
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echo "Calling function with $# aruments"
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}
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# Subsection 2.3
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global_sum=0
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function global_sum_outputs() {
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global_sum=$(($1+$2))
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}
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function cs_sum_outputs() {
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sum=$(($1+$2))
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echo $sum
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}
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# Subsection 2.4
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function arg_ref_sum_outputs() {
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declare -n sum_ref=$3
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sum_ref=$(($1+$2))
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}
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# Subsection 3.1
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variable="baeldung"
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function variable_scope2() {
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echo "Variable inside function variable_scope2: [$variable]"
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local variable="ipsum"
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}
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function variable_scope() {
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local variable="lorem"
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echo "Variable inside function variable_scope: [$variable]"
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variable_scope2
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}
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# Subsection 3.2
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subshell_sum=0
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function simple_subshell_sum() (
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subshell_sum=$(($1+$2))
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echo "Value of sum in function with global variables: [$subshell_sum]"
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)
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function simple_subshell_ref_sum() (
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declare -n sum_ref=$3
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sum_ref=$(($1+$2))
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echo "Value of sum in function with ref arguments: [$sum_ref]"
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)
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# Subsection 3.3
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function redirection_in() {
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while read input;
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do
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echo "$input"
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done
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} < infile
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function redirection_in_ps() {
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read
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while read -a input;
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do
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echo "User[${input[2]}]->File[${input[8]}]"
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done
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} < <(ls -ll /)
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function redirection_out_ps() {
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declare -a output=("baeldung" "lorem" "ipsum" "caracg")
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for element in "${output[@]}"
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do
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echo "$element"
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done
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} > >(grep "g")
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function redirection_out() {
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declare -a output=("baeldung" "lorem" "ipsum")
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for element in "${output[@]}"
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do
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echo "$element"
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done
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} > outfile
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# Subsection 3.4
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function fibonnaci_recursion() {
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argument=$1
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if [[ "$argument" -eq 0 ]] || [[ "$argument" -eq 1 ]]; then
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echo $argument
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else
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first=$(fibonnaci_recursion $(($argument-1)))
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second=$(fibonnaci_recursion $(($argument-2)))
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echo $(( $first + $second ))
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fi
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}
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# main menu entry point
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echo "****Functions samples menu*****"
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PS3="Your choice (1,2,3 etc.):"
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options=("function_definitions" "function_input_args" "function_outputs" \
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"function_variables" "function_subshells" "function_redirections" \
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"function_recursion" "quit")
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select option in "${options[@]}"
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do
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case $option in
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"function_definitions")
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echo -e "\n"
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echo "**Different ways to define a function**"
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echo -e "No function keyword:"
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simple_function
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echo -e "\nNo function parantheses:"
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simple_function_no_parantheses
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echo -e "\nOmitting curly braces:"
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simple_for_loop
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echo -e "\n"
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;;
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"function_input_args")
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echo -e "\n"
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echo "**Passing inputs to a function**"
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simple_inputs lorem ipsum
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echo -e "\n"
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;;
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"function_outputs")
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echo -e "\n"
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echo "**Getting outputs from a function**"
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global_sum_outputs 1 2
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echo -e ">1+2 using global variables: [$global_sum]"
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cs_sum=$(cs_sum_outputs 1 2)
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echo -e ">1+2 using command substitution: [$cs_sum]"
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arg_ref_sum_outputs 1 2 arg_ref_sum
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echo -e ">1+2 using argument references: [$arg_ref_sum]"
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echo -e "\n"
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;;
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"function_variables")
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echo -e "\n"
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echo "**Overriding variable scopes**"
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echo "Global value of variable: [$variable]"
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variable_scope
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echo -e "\n"
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;;
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"function_subshells")
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echo -e "\n"
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echo "**Running function in subshell**"
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echo "Global value of sum: [$subshell_sum]"
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simple_subshell_sum 1 2
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echo "Value of sum after subshell function with \
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global variables: [$subshell_sum]"
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subshell_sum_arg_ref=0
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simple_subshell_ref_sum 1 2 subshell_sum_arg_ref
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echo "Value of sum after subshell function with \
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ref arguments: [$subshell_sum_arg_ref]"
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echo -e "\n"
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;;
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"function_redirections")
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echo -e "\n"
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echo "**Function redirections**"
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echo -e ">Function input redirection from file:"
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redirection_in
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echo -e ">Function input redirection from command:"
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redirection_in_ps
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echo -e ">Function output redirection to file:"
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redirection_out
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cat outfile
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echo -e ">Function output redirection to command:"
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red_ps=$(redirection_out_ps)
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echo "$red_ps"
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echo -e "\n"
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;;
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"function_recursion")
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echo -e "\n"
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echo "**Function recursion**"
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fibo_res1=$(fibonnaci_recursion 7)
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echo "The 7th Fibonnaci number: [$fibo_res1]"
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fibo_res2=$(fibonnaci_recursion 15)
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echo "The 15th Fibonnaci number: [$fibo_res2]"
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echo -e "\n"
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;;
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"quit")
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break
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;;
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*) echo "Invalid option";;
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esac
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done
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@ -0,0 +1,3 @@
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Honda Insight 2010
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Honda Element 2006
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Chevrolet Avalanche 2002
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