做了一个随机抽取某句句子的脚本

[root@mailgateway log]# cat random
#!/bin/sh
a=`cat yum.log|wc -l`
while :
do
#echo $a
var=$RANDOM
# echo $var
if [ $var -le $a ]; then
sed  -n "${var}p" yum.log
echo $var

break
else
echo $var
#sleep 0.5
continue

fi
done
echo ok now