How To Install And Use Wget On Mac OS X To Implement File Download Breakpoint Resume

Wget is an open source file download tool for both Windows, Linux and Mac OS. It can continue get a partially downloaded file which is called breakpoint resume. This article will tell you how to install wget on mac os x and how to use it to implement file download breakpoint resume to continue download a partially download file.

1. Use HomeBrew To Install Wget On Mac OS X.

Open a terminal and run $ brew install wget command in it. But if you find the command line console stuck for a long time, you can press control + c, and then press enter key to break the stuck. Now you will get wget download and install process output information in the console like below.

$ brew install wget
Updating Homebrew...

^C
==> Installing dependencies for wget: gettext, libunistring, libidn2 and openssl
==> Installing wget dependency: gettext
==> Downloading https://homebrew.bintray.com/bottles/gettext-0.19.8.1.mojave.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/af/afc6a6120632b98d58b11fab82ae5e081206b89684dd948abf2d29caeb813ffd?__gda__=exp=1560673282~hmac=0b4d64b6a4c1d53a887dd6f0368402708f5
######################################################################## 100.0%
==> Pouring gettext-0.19.8.1.mojave.bottle.tar.gz
==> Caveats
gettext is keg-only, which means it was not symlinked into /usr/local,
because macOS provides the BSD gettext library & some software gets confused if both are in the library path.

If you need to have gettext first in your PATH run:
  echo 'export PATH="/usr/local/opt/gettext/bin:$PATH"' >> ~/.bash_profile

For compilers to find gettext you may need to set:
  export LDFLAGS="-L/usr/local/opt/gettext/lib"
  export CPPFLAGS="-I/usr/local/opt/gettext/include"

==> Summary
?  /usr/local/Cellar/gettext/0.19.8.1: 1,935 files, 16.9MB
==> Installing wget dependency: libunistring
==> Downloading https://homebrew.bintray.com/bottles/libunistring-0.9.10.mojave.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/1d/1d0c8e266acddcebeef3d9f6162d6f7fa0b193f5f71837174fb2ef0b39d324f3?__gda__=exp=1560673292~hmac=a0bae8d39d8884125107a55921a7f0a4979
######################################################################## 100.0%
==> Pouring libunistring-0.9.10.mojave.bottle.tar.gz
?  /usr/local/Cellar/libunistring/0.9.10: 54 files, 4.4MB
==> Installing wget dependency: libidn2
==> Downloading https://homebrew.bintray.com/bottles/libidn2-2.2.0.mojave.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/1b/1bddaa4464445f918c144762158254ac72edbc1f7328467a259a03aeb7bd547d?__gda__=exp=1560673297~hmac=61379198b3bc35dbdd1c5911d858694356c
######################################################################## 100.0%
==> Pouring libidn2-2.2.0.mojave.bottle.tar.gz
?  /usr/local/Cellar/libidn2/2.2.0: 70 files, 700.9KB
==> Installing wget dependency: openssl
==> Downloading https://homebrew.bintray.com/bottles/openssl-1.0.2r.mojave.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/c1/c1f8c06740398325c7028213b20b18c5de39763fbc81e5819c78a06ee0621170?__gda__=exp=1560673301~hmac=d29a167de9e75b72c06bcd1ecee8a3466f4
######################################################################## 100.0%
==> Pouring openssl-1.0.2r.mojave.bottle.tar.gz
==> Caveats
A CA file has been bootstrapped using certificates from the SystemRoots
keychain. To add additional certificates (e.g. the certificates added in
the System keychain), place .pem files in
  /usr/local/etc/openssl/certs

and run
  /usr/local/opt/openssl/bin/c_rehash

openssl is keg-only, which means it was not symlinked into /usr/local,
because Apple has deprecated use of OpenSSL in favor of its own TLS and crypto libraries.

If you need to have openssl first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl/bin:$PATH"' >> ~/.bash_profile

For compilers to find openssl you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl/include"

==> Summary
?  /usr/local/Cellar/openssl/1.0.2r: 1,795 files, 12.1MB
==> Installing wget
==> Downloading https://homebrew.bintray.com/bottles/wget-1.20.3_1.mojave.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/96/96a58c26308afae033e6d6325e7af3f20618b4ca84f2d265ba3ca16a5eae7e65?__gda__=exp=1560673310~hmac=1580578eb65d832423b6e9394b9f90abb88
######################################################################## 100.0%
==> Pouring wget-1.20.3_1.mojave.bottle.tar.gz
?  /usr/local/Cellar/wget/1.20.3_1: 49 files, 4.0MB
==> `brew cleanup` has not been run in 30 days, running now...
Error: Cask adoptopenjdk8 exists in multiple taps:
  homebrew/cask-versions/adoptopenjdk8
  caskroom/versions/adoptopenjdk8

2. Find Out Where Wget Is Installed.

You can run command type -a wget in a terminal to find out where wget is installed in your mac os.

$ type -a wget
wget is /usr/local/bin/wget

3. How To Use Wget.

3.1 Get Web Page Content.

Run $ wget page_url in terminal will get and save the requested url page content in a local file. You will see below output in terminal. The page_url can be a http, https or ftp protocol format url.

$ wget www.dev2qa.com
--2019-06-16 18:19:15--  http://www.dev2qa.com/
Resolving www.dev2qa.com (www.dev2qa.com)... 104.27.146.13, 104.27.147.13
Connecting to www.dev2qa.com (www.dev2qa.com)|104.27.146.13|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://www.dev2qa.com/ [following]
--2019-06-16 18:19:16--  https://www.dev2qa.com/
Connecting to www.dev2qa.com (www.dev2qa.com)|104.27.146.13|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: ‘index.html’

index.html                                       [    <=>                                                                                       ] 112.12K   122KB/s    in 0.9s    

2019-06-16 18:19:19 (122 KB/s) - ‘index.html’ saved [114815]

In above example, the index.html file is saved in the directory where you run the wget command. You can run command ls -l in terminal to see the saved index.html file.

$ ls -l
total 232
......
-rw-r--r--   1 songzhao  staff  114815 Jun 16 18:19 index.html
......

3.2 Show Current Wget Version.

$ wget --version
GNU Wget 1.20.3 built on darwin18.6.0.
......

4. How To Implement Resume Download Use Wget.

If you want to resume download a partially downloaded file use wget, you can follow below steps.

  1. Open a terminal and run cd command to go to the previous partially downloaded file saved directory.
  2. Run command line wget -c file_url, or wget -continue file_url in the terminal under above directory, the -c or -continue parameter for wget command will tell wget to continue download previous file from the offset of the exist file size. If the file_url is same, then the downloaded local file name is same.

References

  1. Pass Download Popup Dialog Using Selenium Webdriver And WGet

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