用输入的字符串和任意一个数字进行运算,可以判断

1,用输入的字符串和任意一个数字进行运算,可以判断!

代码:

#!/bin/ksh 
# 
var=$(echo "$1*1"|bc) 
if [[ $var != 0 ]] 
then 
echo "$1 is a number" 
else 
echo "$1 is a charter" 
fi

2,用流编辑器sed!

代码:

if [ -n "`echo $1|sed -n '/^[0-9][0-9]*$/p'`" ] 
then 
echo "$1 is number!" 
else 
echo "$1 is not number!" 
fi

3,用awk来判断!

代码:

echo $1|awk '{if($0~/[^0-9]/) {print "'$1' is not number"} else{print "'$1' is number"}}'