检测用户输入是否合法
#!/bin/bash
# validAlphaNum - Ensures that input consists only of alphabetical
# and numeric characters.
# 检测输入是否只有数字和字母
#
validAlphaNum()
{
compressed="$(echo $1 | sed -e 's/[^[:alnum:]]//g')" #替换掉特殊字符标点
if [ "$compressed" != "$input" ] ; then
return 1
else
return 0
fi
}
# Sample usage of this function in a script
##########################
#1.输入
#########################
echo -n "Enter input: "
read input
if ! validAlphaNum "$input" ; then
echo "Your input must consist of only letters and numbers." >&2 #您的输入必须只能包含字母和数字
exit 1
else
echo "Input is valid." #输入有效
fi
exit 0
##################################################
测试：
[root@www ~]# ./check_input_alnum.sh
Enter input: fdsadfa
Input is valid.
[root@www ~]# ./check_input_alnum.sh
Enter input: dfaf,,.
Your input must consist of only letters and numbers.