Bash script to repeat strings.

repeat_string.sh

#!/usr/bin/env bash
# Repeat String
#
# Usage repeat_string "-"
#       repeat_string "-" 20
# ARG1: String
# ARG2: Count [optional]
repeat_string() {

    sep=$1
    count=$2

    [ -z "$sep" ] && {
        sep="="
    }

    [ -z "$count" ] && {
        count=40
    }

    re='^[0-9]+$'
    if ! [[ $count =~ $re ]]; then
        echo "error: Not a number" >&2
        exit 1
    fi

    echo
    printf "=%.0s" $(seq "$count")
    echo
}