Shell Development of X Pishu

Recently, we are busy developing data synchronization for Douban, mainly because the Douban interface is not powerful and the data cannot be captured when the access volume exceeds a certain value. Therefore, we decided to import Douban data to the local server and then use our own data. I have developed the script for importing data. Now the command line call is left. Today I have devoted myself to the shell application. I will write down my thinking process. Prepare the PHP test script to be used (not my online Code ).

<? PHP  If ( $ _ Server ['Argc '] <2 ){  Echo "The call is incorrect! \ N" ;  Echo "Call method :" ;  Echo "Php { $ _ Server ['Argv'] [0]} {rsync_show | rsync_show_by_id 1231123 | rsync_douban} \ n" ;  Exit (-1 );}  Function  Rsync_show (){  Echo "Call program data \ n" ;}  Function Rsync_show_by_id ( $ ID  ){  If ( Empty ( $ ID  )){ Echo "The parameter... \ n is missing" ;  Exit (-1 );}  Echo "Start to import program data \ n Based on the specified ID" ;}  Function  Rsync_douban (){  Echo "Call Douban data layer \ n" ;}  Foreach ( $ _ Server ['Argv'] As   $ K =>$ V  ){  If ( $ K = 0) Continue  ;  If ( $ V = 'Rsync _ show_by_id' ){  Call_user_func ( $ V , $ _ Server ['Argv'] [2 ]);  Break ;}  Else  {  Call_user_func ( $ V  );}}  Exit (0 );

View several call results

Error 1

Error 2

Correct call Method

 

Set a scheduled execution script through crontab-e

 

 

 

Shell script 1. Start programming with shell scripts

Run scripts

 

2. Add a stop script.

 

 

3. Sort Functions

 

There are two major issues with Shell Vulnerability Detection: 1. Do you want to write another method? 2. How do I transmit parameters?

The first problem is simply using the start method. There is no need to write another method! -- Writing one more method is costly.

How to solve the second problem, I suddenly thought that we liked it when installing open-source software, as shown in

So I decided to use a similar method for parameter passing.

For details, refer to the method call below!

Run scripts

 Key Points:

1. function call

Start $2 # This is a function + Parameter

$1 in the function indicates the first parameter!

2. Character Truncation

$}It indicates that the value in the $1 variable starts from 2nd (the subscript starts from 0) subscripts and intercepts 2 characters in length.

Id =1 {1 # -- id =} indicates to delete the substring that has recently matched -- id = from the beginning of $1.

 

 Put in crontab

 

My PHPSource codeConfigure found a good way to output characters.

 Recently, it was found that the script could not be executed in one day. As a result, multiple scripts are executed in the background. The solution is as follows:

 

 Running Effect

 

 

Complete source code

#! /Bin/ Bashwork_dir = "  /Home/www/test/  " Script_name = Index. php  Function  Start (){  If [ "  $1  " ! = "" ] & [$ { 1 : 2 : 2 } = "  ID  " ]  Then  ID =$ { 1 #-- ID = }  Echo   "  Start to import data with ID $ ID  "  Nohup PHP $ work_dir /$ Script_name rsync_show_by_id $ ID & Exit  0      Fi  PID ='PS Aux | Grep $ Script_name | Grep -V Grep | Awk   '  {Print $2}  '  '  If [ "  $ PID  " ! = ""  ]  Then         Echo   "  The script has been started...  "  Exit  0      Fi        Echo   "  Start importing data...  "  Nohup PHP $ work_dir /$ Script_name rsync_show rsync_douban & }  Function  Stop (){  Echo  "  End data import...  "  # Pkill - 9 - F index. php PID =' PS Aux | Grep $ Script_name | Grep -V Grep | Awk   '  {Print $2}  '  ' If [ "  $ PID  " ! = ""  ]  Then          Kill - 9 $ PID &>/dev/ Null      Fi  }  Function  Restart () {stop start}  Case   " $1  "   In  Start) Start $  2  ; Stop) Stop; restart) restart ;; * )  Cat < _ Aceof usage: $  0 {START | stop | Restart} Option configuration $  0 Start -- ID = 1003 _ Aceof ;;  Esac  Exit  0 

 

 

To sum up, this is what I have gained today. I am not very proficient in shell. If you have better suggestions, I hope to inform you of them.

 

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