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5 years ago
#!/bin/bash
#-----------------------------------------------------------
# Usage: 生成随机数
#
#-----------------------------------------------------------
function TimestampRand()
{
range=$1
timestamp=`date +%s%N`
let res=$timestamp%$range
echo $res
}
function RandomRand()
{
range=$1
let res=$RANDOM%$range
echo $res
}
function UrandomRand()
{
range=$1
rand=`head -200 /dev/urandom | cksum | cut -f1 -d" "`
let res=$rand%$range
echo $res
}
function UuidRand()
{
range=$1
rand=`cat /proc/sys/kernel/random/uuid| cksum | cut -f1 -d" "`
let res=$rand%$range
echo $res
}
function exp()
{
echo "基于时间戳: `TimestampRand 10`"
echo "基于\$RANDOM: `RandomRand 10`"
echo "基于urandom: `UrandomRand 10`"
echo "基于uuid: `UuidRand 10`"
str=""
for i in `seq 1 6`;do
str="$str`RandomRand 9`"
done
echo $str
echo "字符翻转:"
echo $str | rev
echo $str | awk '{for(i=1;i<=length;i++){line=substr($0,i,1)line}}END{print line}'
}
$@
[root@node130 tmp]# cat b.sh
#!/bin/bash
#-----------------------------------------------------------
# Usage: 生成随机数
#
#-----------------------------------------------------------
function TimestampRand()
{
range=$1
timestamp=`date +%s%N`
let res=$timestamp%$range
echo $res
}
function RandomRand()
{
range=$1
let res=$RANDOM%$range
echo $res
}
function UrandomRand()
{
range=$1
rand=`head -200 /dev/urandom | cksum | cut -f1 -d" "`
let res=$rand%$range
echo $res
}
function UuidRand()
{
range=$1
rand=`cat /proc/sys/kernel/random/uuid| cksum | cut -f1 -d" "`
let res=$rand%$range
echo $res
}
function exp()
{
echo "基于时间戳: `TimestampRand 10`"
echo "基于\$RANDOM: `RandomRand 10`"
echo "基于urandom: `UrandomRand 10`"
echo "基于uuid: `UuidRand 10`"
str=""
for i in `seq 1 6`;do
str="$str`RandomRand 9`"
done
echo $str
echo "字符翻转:"
echo $str | rev
echo $str | awk '{for(i=1;i<=length;i++){line=substr($0,i,1)line}}END{print line}'
}
$@