Loop Script throws 0 by executing touch - bash

Question

I'm writing a script that makes a while loop for me, that I doesn't have to write a one line while loop again and again.
Short explanation:
The command "loop" will execute the command parameter -n times and with -p seconds pause. You can use -e to echo the command and not execute it. -v to show all parameters. Additionally its possible to use the iterator of the while loop.
Playing around with it, I've found a bug.
loop --verbose --times 5 'touch testfile$i'
#loop the touch command 5 times and generate the testfiles 0 to 4
same as:
loop -v -n 5 'touch testfile$i'
It generate "testfile0" to "testfile4" but also a file named "0"
Do somebody know why the file "0" will be generated?
And what do you think about a command like that? Would you like to use it?
Best
Steven
#!/bin/bash
# easy to use loop command
#
# Autor: Steven Wagner
# Date: 22 June 2018
# Version: 0.1
TIMES=0
FREQUENCY=0
PAUSE="0"
VERBOSE=false
ECHOONLY=false
SILENCE=false
POSITIONAL=()
while [[ $# -gt 0 ]]
do
key="$1"
case $key in
-n|--times)
temp="$2"
if [[ $temp =~ ^[[:digit:]]+$ ]];
then
TIMES=$temp
else
echo "ERROR: value is not a digit"
exit
fi
shift # past argument
shift # past value
;;
-p|--pause)
#PAUSE="$2"
temp="$2"
PAUSE=$temp
#if [[ $temp =~ ^[[:digit:]]+$ ]];
#then
# PAUSE=$temp
#else
# echo "ERROR: value is not a digit"
# exit
#fi
shift # past argument
shift # past value
;;
-v|--verbose)
VERBOSE=true
shift # past argument
;;
-e|--echo-only)
ECHOONLY=true
shift # past argument
;;
-s|--silence)
SILENCE=true
shift # past argument
;;
--*)
echo "Error \"$key\" not known"
shift #past argument
;;
-*)
i=0
while [[ $i -lt ${#key}-1 ]]
do
char=${key:$[$i+1]:1}
case $char in
v)
VERBOSE=true
;;
e)
ECHOONLY=true
;;
s)
SILENCE=true
;;
esac
(( i++ ))
done
shift # past argument
;;
*) # unknown option
POSITIONAL+=("$1") # save it in an array for later
shift # past argument
;;
esac
done
set -- "${POSITIONAL[#]}" # restore positional parameters
#Pause make sleep command
pause=""
if [ $PAUSE > 0 ]
then
pause="sleep $PAUSE"
fi
#times make while control-command
times=""
if [ $TIMES != 0 ]
then
times="[ \$i -lt \$TIMES ]"
else
times="true" #infinity loop
fi
#Echo Only
command=$#
if $ECHOONLY
then
command="echo $#"
fi
#Silence
silence=""
if $SILENCE && ! $ECHOONLY
then
silence="&>/dev/null"
fi
if $VERBOSE
then
echo "pause = $PAUSE"
if [ $TIMES != 0 ]
then
echo "times = $TIMES"
else
echo "times = infinity"
fi
if $ECHOONLY; then echo "echo only = yes"; fi
if $SILENCE; then echo "silence = yes"; fi
echo "command = '$#' $silence"
echo
fi
#start the loop
timestamp=$(date +%s%N)
eval "
i=0
while $times
do
eval '$command' $silence
$pause
(( i++ ))
done
"
if $VERBOSE
then
echo
echo "duration: $[($(date +%s%N)-$timestamp)/1000000]ms"
fi