Function call in shell programming

For how to use the function call in shell, see the following code example:

#!/bin/bash# value initExP="adb shell /data/local/tmp/vpxdec  --yv12 --flipuv  -t 2 --md5   data/local/tmp/vp9Input/subset_function_test/Boating_1920x1080_t4_yv12_400frames_skip200.webm";TT="adb shell ls -l /data/local/tmp/";loop_count=2;targetMd5="2e8698fe47dd40bf6260206416530985";# Compare two value and output result，$1 is src,$2 is targetfunction Compare(){    #echo "Source value:$1, Target value:$2";    if [ "$1" = "$2" ]; then            echo "The same!";        return 0;    else            echo "Different!"        return 1;    fi    }# LoopEx: excute a programm in a loop, $1 is program,$2 is loop count, $3 is targetMd5function LoopEx(){    local Ex=$1;    local loop_count=$2;    local target=$3;    echo -e "Programm is $Ex \nloop_count ==$loop_count, TargetMd5==$target"    for i in $(seq $loop_count); do        local output=$($Ex);        local outputMd5=${output:0:32}        Compare $outputMd5 $target;        if [ "$?" != "0" ]; then            echo "Loop Break index is [$i],result MD5:$outputMd5"            break        fi    done;}# function main, shell excute from herefunction Main(){    echo "Imagation GPU Version test run ...";    LoopEx "$ExP" $loop_count $targetMd5}Main;

You can use this template to write other simple scripts later.