Shell script: Create function and specify directory to download

Write a script:

1, create a function, can accept two parameters:

1) The first parameter is a URL, you can download the file, the second parameter is a directory, that is, the location of the download after the save;

2) If the user-given directory does not exist, the user is prompted to create it, or if it is created, the function returns a 51 error value to the calling script;

3) If the given directory exists, then download the file; Download command after the execution of the test file download success or not; If successful, return 0 to the calling script, otherwise, return 52 to the calling script;

Topics from 51cto forum posts, reference to the answer of the great God, and then their own perfect to make, we have a better way to write it out.

#!/bin/bash#writen by mofansheng @2015-08-10url=$1dir=$2download () {         cd  $dir  &>/dev/null        if  [ $? -ne 0 ]        then         read -p  "$dir  no such file or directory, Create now? (y/n) " answer                 if [  "$answer"  ==   "y"  ];then                 mkdir -p  $dir                  cd  $dir                  wget  $url  &>/dev/null                          if [ $? -ne 0 ];then                         return   "                "         fi                 else                 return  "Wuyi"                  fi        else         wget  $url  &>/dev/null                 if [ $? -ne 0 ];then                 return  "      "           fi         fi}download  $url   $direcho  $?

A lot of if judgment a bit confused;

Validation results:

Directory exists, then return 0, download the file into the existing directory;

[[Email protected] ~]# sh 1.sh http://www.baidu.com/index.php yong0[[email protected] ~]# ls yong/index.php

The directory does not exist, prompts whether to create, select N is not created, then returns 51;

[[Email protected] ~]# sh 1.sh http://www.baidu.com/index.php fanfan No such file or Directory,create now? (y/n) n51

The directory does not exist, prompts whether to create, select Y to Create, and download the file into the newly created directory;

[[Email protected] ~]# sh 1.sh http://www.baidu.com/index.php fanfan No such file or Directory,create now? (y/n) y0[[email protected] ~]# ls fan/index.php

The download file is unsuccessful and returns 52;

[Email protected] ~]# sh 1.sh http://www.baidu.com/xxxx.php fan52

This article is from the "Model Student's Learning blog" blog, please be sure to keep this source http://mofansheng.blog.51cto.com/8792265/1683714

Shell script: Create function and specify directory to download