Shell file test, menu presentation idea

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File test expression
-F file exists and is a normal file
-D file exists and is a directory file
-S file size is not 0 true
-e file exists then true

-R file is saved and readable #文件属性对于root有时不好用
-W Write
-X execution
-L exists and is a linked file
F1-nt F2 F1 than F2 new is true
F1-ot F2 F1 than F2 old is true
These operators can be used for [[]],[],test almost universal, more operators to view man test.

Production Example:
Prog= "Rpcbind"
[-f/etc/sysconfig/$prog] &&. /etc/sysconfig/$prog #如果存在则加载
[-f/etc/sysconfig/$prog] | | Exit 1 #不存在退出


Case 2, curly braces can execute multiple commands
[$q-eq 3]&&{
Echo 1
Echo 2
Echo 3
}

Determine whether it is an integer: Remove "non-numeric" equals itself ["' Echo ' 123a|sed-r ' s#[^0-9]# #g '" = "123a"]

#!/bin/sh
Read-p "pls input" num: "NUM1 num2
A=num1
B=num2
#no. 1
[$#-ne 2]&&{# "$#" indicates the number of variables entered
echo "Usage:num1 num2"
Exit 1
}
#no. 2
[' echo ' $a ' |sed-r ' s#[^0-9]# #g ' "=" $a "]| | {
echo "First arg must be int"
Exit 2
}
#no. 3
[$1-lt $b]&&{
echo "$a < $b"
Exit 3
}

Enterprise Comprehensive case: 1. When the user enters 1 o'clock, the output "start install lamp." "Then execute/server/script/lamp.sh, script content output" lamp is install "after exit script
2. When the user outputs 2 o'clock, the output "start install LNMP. "Then execute/server/script/lnmp.sh, script content output" LNMP is install "after exiting the script
3. Exit the current menu and script when entering 3 o'clock
4. Exit the script when you enter any other ego and give the hint "input error"
5. To make a conditional judgment on the executed script, for example: whether the script exists, whether it can be executed, etc.
Print Simple Selection Menu Example 1,
Cat <<end
1.wangfei
2.gongli
END
Read-p "which do you like?:" A
echo "I guess,you like $a"
Print Simple Selection Menu Example 2, function notation,
Menu () {
Cat <<end
1.[install Lamp]
2.[install LNMP]
3.[exit]
pls input the num you want:
END
}
Menu
Read num
["$num" = "1"]&&{
echo "Start install lamp."
[-x/server/script/lamp.sh]| | {
echo "lamp.sh Error"
Exit 2}
. /server/script/lamp.sh
}
["$num" = "3"]&&{
echo "Bye"
Exit 0
}
echo "Iput Error"
Exit 1
To print a multi-level menu Example:

Cat << EOF
|-----------System Infomation-----------
| DATE: $DATE
| HOSTNAME: $HOSTNAME
| USER: $USER
| IP: $IPADDR
| disk_used: $DISK _SDA
| Cpu_average: $cpu _uptime
----------------------------------------
|****please Enter Your choice:[0-5]****|
----------------------------------------
(1) Configure $SERVER 1 Service
(2) Configure $SERVER 2 Service
(3) Configure Networke Service
(4) Change Passwd
(5) Logs
(0) Quit
Eof
Read-p "Please enter your choice[0-5]:" Input
Case $input in
#web Service
1)
Clear
While ["$flag"-eq 0]
Do
Cat << EOF
----------------------------------------
|****please Enter Your choice:[0-3]****|
----------------------------------------
(1) Start $SERVER 1 Service
(2) Stop $SERVER 1 Service
(3) ReStart $SERVER 1 Service
(0) Back
Eof
Read-p "Please enter your choice[0-3]:" INPUT1
Case $input 1 in
1)
Echo-e "\n>>>>>>>>>>> $DATE Start $SERVER 1" >>/log.txt
$SERVER 1_start 2>>/log.txt
If [$? = = 0];then
echo "Start $SERVER 1 .... ..... ..... ..... .............................. [OK] "
Else
echo "Start $SERVER 1 .... ..... ..... ..... .............................. [FAILED] "
Fi
Sleep 5
Clear
;;
2)
Echo-e "\n>>>>>>>>>>> $DATE Stop $SERVER 1" >>/log.txt
$SERVER 1_stop 2>>/log.txt
If [$? = = 0];then
echo "Stop $SERVER 1 ..... ..... ..... ..... .............................. [OK] "
Else
echo "Stop $SERVER 1 ..... ..... ..... ..... .............................. [FAILED] "
Fi
Sleep 5
Clear
;;
3)
Echo-e "\n>>>>>>>>>>> $DATE ReStart $SERVER 1" >>/log.txt
/USR/LOCAL/TDOA/PHP/SBIN/PHP-FPM Restart 2>>/log.txt
$SERVER 1_restart 2>>/log.txt
If [$? = = 0];then
echo "Restart $SERVER 1 .... ..... ..... ................................ [OK] "
Else
echo "Restart $SERVER 1 .... ..... ..... ................................ [FAILED] "
Fi
Sleep 5
Clear
;;
0)
Clear
Break
;;
*) echo "----------------------------------"
echo "|            Warning!!! |"
echo "|   Please Enter right choice! |"
echo "----------------------------------"

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Shell file test, menu presentation idea