shell 判断传参是否为整数、字符串脚本

!/bin/bash

function check(){
local a="a" &>/dev/null && echo "integer" && return
printf "%d" "a|sed 's/^[+-]?0+//')" &>/dev/null && echo "integer" && return
printf "%f" "{#a} -eq 1 ] && echo "char" && return
echo "string"
}

check $1