1.词频统计
sed -e s/'[[:punct:]]'/' '/g -e s/'[[:digit:]]'/' '/g $filename| tr [A-Z] [a-z] | tr ' ' ' '| tr ' ' ' ' | sed '/^$/d' >>newfilename
#干掉文本中的标点和数字
#替换大小写
#替换换行符为空格后再替换空格为换行符(可能不必要)
#删除空行重定向到新文件
sort newfilename| uniq -c | sort -n
#排序后删除重复项并统计重复个数，然后重新排序。sort -n的作用是按照数值进行排序。
统计部分也可以用awk来搞：sed -e s/'[[:punct:]]'/' '/g -e s/'[[:digit:]]'/' '/g $filename| tr [A-Z] [a-z] | tr ' ' ' '|awk 'BEGIN{RS=" "} {++w[$0]} END{for(a in w) if(a!="") print a": "w[a]}'|sort -k2 -n
输出结果都差不多。
2.用ping看本网段在线的ip地址。
for i in `seq 2 255`
do
ping -c 1 "192.168.1.$i"|grep "1 received " && echo "192.168.1.$i"
done
3.简单的系统监控脚本
#!/bin/sh
CONTINUE(){
read -p "press enter to continue:"
}
CPU_INFO(){
echo "print the cpu info:"
cat /proc/cpuinfo|awk 'BEGIN{FS=":"}/model name/{print "CPU model:"$2}'|uniq
cat /proc/cpuinfo|awk 'BEGIN{FS=":"}/cpu MHz/{print "CPU MHz:"$2"MHz"}'|uniq
}
LOAD_INFO(){
echo
echo "print the system load info:"
uptime|awk 'BEGIN{FS=":"}{print $5}'|awk 'BEGIN{FS=","}{print "last 1 minute sys load:"$1"
last 5 minutes sys load"$2"
last 15minutues sysload:"$3"
"}'
}
MEM_INFO(){
echo
echo "print the system memory and swap info:"
free -h |grep Mem|awk 'BEGIN{FS=" "}{print "system free memory info:"$4""}'
free -h |grep Swap|awk 'BEGIN{FS=" "}{print "system swap info:"$4""}'
}
DISK_INFO(){
echo
echo "print the system disk info:"
df -h
echo
}
MAIN(){
clear
echo "============================================"
echo "1.display the cpu info;"
echo "2.display the sys load;"
echo "3.display MEM and swap info;"
echo "4.display the sys disk info;"
echo "5.EXIT;"
echo "============================================"
read -p "please select an iterm(1-5):" SELECT
CHOICE
}
CHOICE(){
case $SELECT in
1)
CPU_INFO
CONTINUE
MAIN
;;
2)
LOAD_INFO
CONTINUE
MAIN
;;
3)
MEM_INFO
CONTINUE
MAIN
;;
4)
DISK_INFO
CONTINUE
MAIN
;;
5)
exit
;;
*)
CONTINUE
MAIN
;;
esac
}
MAIN