Shell script Common script: while

Whileconditional Sentence

Grammar:

Condition to meet always done

While condition

Do

instruction

Done

==========

Conditional satisfaction exit (rare)

Until conditions

Do

instruction

Done

  Script instance: Daemon monitoring

Sleep: Print per second

Usleep: microsecond printing in microseconds (one out of 10,000 seconds);

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: 2- second print ( dead loop ) Daemon

#Version: version V1.1

#Update: 2016-11-22 15:04:12

While True

Do

# View System Performance

Uptim

print #2 seconds , and save to Uptim.log

Sleep 2 >uptim.log

Done

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: microsecond seconds Print ( dead loop ) Daemon

#Version: version V1.1

#Update: 2016-11-22 15:04:12

While True

Do

# View System Performance

Uptim

print #2 seconds , and save to Uptim.log

Usleep >uptim.log

Done

  Script instance:1-100sum

Not suitable for large data large data use formula calculation

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: 1-100 sum

#Version: version V1.1

#Update: 2016-11-22 15:04:12

# define $i values

I=1

# define $sum values

Sum=0

# Judge $i <=100

while ((i<=100))

Do

((Sum=sum+i))

((i++))

Done

# Direct Display value:5050

#echo $sum

# Show Results:sum=5050

#echo "Sum= $sum"

# Beautiful display totalsum is:5050

[-N "$sum"] && printf "totalsum is: $sum \ n"

Calculate ※※※※※ directly using mathematical formulas
[email protected] ~]$ cat gongshi.sh
#!/bin/sh
i=100
echo $ ((i* (i+1)/2))
---------
[email protected] ~]$ cat gongshi-2.sh
#!/bin/sh
i=100
((sum=i* (i+1)/2))
Echo $sum
---------
[[email protected] ~]$ echo $ ((100* (100+1)/2))
5050

 Script instance: Lifting display Value

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: display in ascending order

#Version: version V1.1

#Update: 2016-11-22 15:04:12

I=1

Sum=0

while ((i<=100))

Do

((sum=i))

((i++))

Done

#echo $sum

#echo "Sum= $sum"

[-N "$sum"] && printf "totalsum is: $sum \ n"

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: Descending display

#Version: version V1.1

#Update: 2016-11-22 15:04:12

I=1

Sum=0

while ((i<=100))

Do

((sum=i))

((i--))

Done

#echo $sum

#echo "Sum= $sum"

[-N "$sum"] && printf "totalsum is: $sum \ n"

Script instance: web site load Balancing test

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: site Test is linked once

#Version: version V1.1.1

#Update: 2016-11-22 15:04:12

While Trie

Do

Curl-i-S Http://1.1.1.com/|head-l

Sleep 10

Done

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: site test 2 Second link once, have the result of judgment

#Version: version V1.1.2

#Update: 2016-11-22 15:04:12

While True

Do

Ststus= ' Curl-i-S--connect-timeout $ |head-l|cut-d ""-F 2 '

If ["$status" = "$"]; then

echo "This URL is good"

Else

echo "This URL was bad"

Fi

Sleep 2

Done

#!/bin/bash

#Date: 2016-11-22 15:04:12 # #date "+%y-%m-%d%h:%m:%s"

#Author: Jorbabe

#Mail: [Email protected]

#Function: site test 2 Second link once, have the result of judgment

#Version: version V1.1.3

#Update: 2016-11-22 15:04:12

# Call system Functions

. /etc/init.d/functions

While True

Do

Ststus= ' Curl-i-S--connect-timeout $ |head-l|cut-d ""-F 2 '

If ["$status" = "$"]; then

echo "This URL is good" /bin/true

Else

echo "This URL was bad" /bin/false

Fi

Sleep 2

Done

Shell script Common script: while