实现以定义变量,脚本传参以及read读入的方式比较2个整数
read方式:
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#!/bin/bash
read
-p
"pls input two num:"
a b
#测试字符串是否为0
[ -z
"$a"
] || [ -z
"$b"
] &&{
#-z:检测字符串长度是否为0,为0返回 true。
echo
"pls input two num again:"
exit
1
}
expr
$a + 0 &>
/dev/null
RETVAL1=$?
expr
$b + 0 &>
/dev/null
RETVAL2=$?
test
$RETVAL1 -
eq
0 -a $RETVAL2 -
eq
0||{
#-a:与运算,两个表达式都为 true 才返回 true。
echo
"Pls input two num again: "
exit
2
}
[ $a -lt $b ] && {
echo
"$a < $b"
exit
0
}
[ $a -
eq
$b ] && {
echo
"$a = $b"
exit
0
}
[ $a -gt $b ] && {
echo
"$a > $b"
exit
0
}
验证奇迹的时刻:
[root@XCN ~]
# sh test1.sh
Pls input two num:1 2
1 < 2
[root@XCN ~]
# sh test1.sh
Pls input two num:1 1
1 = 1
[root@XCN ~]
# sh test1.sh
Pls input two num:3 1
3 > 1
|
脚本传参:
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#!/bin/bash
a=$1
b=$2
[ -z
"$a"
] || [ -z
"$b"
] && {
echo
"pls input two num again:"
exit
1
}
expr
$a + 0 &>
/dev/null
RETVAL1=$?
expr
$b + 0 &>
/dev/null
RETVAL2=$?
test
$RETVAL1 -
eq
0 -a $RETVAL2 -
eq
0 || {
echo
"pls input two num again:"
exit
2
}
[ $a -lt $b ] && {
echo
"$a < $b"
exit
0
}
[ $a -
eq
$b ] && {
echo
"$a = $b"
exit
0
}
[ $a -gt $b ] && {
echo
"$a > $b"
exit
0
}
验证奇迹的时刻:
[root@XCN ~]
# sh test1.sh 2 3
2 < 3
[root@XCN ~]
# sh test1.sh 1 1
1 = 1
|
定义变量:
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#!/bin/bash
a=1
b=1
[ -z
"$a"
] || [ -z
"$b"
] && {
echo
"pls input two num again:"
exit
1
}
expr
$a + 0 &>
/dev/null
RETVAL1=$?
expr
$b + 0 &>
/dev/null
RETVAL2=$?
test
$RETVAL1 -
eq
0 -a $RETVAL2 -
eq
0 || {
echo
"pls input two num again:"
exit
2
}
[ $a -lt $b ] && {
echo
"$a < $b"
exit
0
}
[ $a -
eq
$b ] && {
echo
"$a = $b"
exit
0
}
[ $a -gt $b ] && {
echo
"$a > $b"
exit
0
}
验证奇迹的时刻:
[root@XCN ~]
# sh test1.sh
1 = 1
|
本文转自 baishuchao 51CTO博客,原文链接:http://blog.51cto.com/baishuchao/1941188