Some simple instances of shell scripting

1. Word Frequency statistics

Sed-e s/' [[:p UNCT:] '/'/g-e s/' [[:d igit:] '/'/g $filename | tr [A-z] [a-z] | Tr ' \ n ' | Tr ' \ n ' | Sed '/^$/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 (may not be necessary)

#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, and then reorder. The function of sort-n is to sort by numerical values.

The statistics section can also be used with awk: sed-e s/' [[:p UNCT:] '/'/g-e s/' [[:d igit:] '/'/g $filename | tr [A-z] [a-z] | Tr ' \ n ' ' |awk ' begin{rs= ""} {++w[$0]} end{for (A in W) if (a!= "") Print a ":" W[a]} ' |sort-k2-n

The output is similar.

2. Use ping to see the IP address of this network segment online.

For i in ' seq 2 255 '

Do

Ping-c 1 "192.168.1. $i" |grep "1 received" && echo "192.168.1. $i"

Done

3. Simple system Monitoring script

#!/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: "$ $} ' |uniq

Cat/proc/cpuinfo|awk ' begin{fs= ': "}/CPU mhz/{print" cpu MHz: "$ $" MHz "} ' |uniq

}

Load_info () {

Echo

echo "Print the system load info:"

Uptime|awk ' begin{fs= ":"}{print $ |awk ' begin{fs= ","}{print "last 1 minute sys load:" $ "\nlast 5 minutes sys load" $ "\nl AST 15minutues sysload: "$" \ n "}"

}

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

Some simple instances of shell scripting