Wget utility used for download files from the web, It support protocols like, HTTP, HTTPS, FTP. The wget installed in build Linux / Unix and Mac operating system, if  you could not found that package can be installed manually. Wget has developed for robustness or managing unstable network connection problem.

1. How to Install?

If you could not found the wget command on terminal try to install in single command,

For ubuntu/Debian

#  apt-get install wget

For CentOS, Fedora, RHEL
 
# yum install wget

2. Find wget command location?

Both command can shows installed location and executable file
 
# which wget
/usr/bin/wget
# whereis wget
wget: /usr/bin/wget /usr/bin/X11/wget /usr/share/man/man1/wget.1.gz


3. Download single file:

For download a file give wget with that URL, Once enter the command file will be downloaded and display information about  file length, download time duration, Total file space and completed status(100%).
 
#  wget http://www.dsgnwrld.com/am/tomcat/tomcat-8/v8.0.11/bin/apache-tomcat-8.0.11.tar.gz

If you could not download the files give single quote 'URL'
 
# wget  'http://www.dsgnwrld.com/am/tomcat/tomcat-8/v8.0.11/bin/apache-tomcat-8.0.11.tar.gz'

4. Download file with --no-check-certificate

You may get an error when you downloading a files from the https URL for Unable to establish SSL connection.  Run  the command with option  --no-check-certificate.
 
# wget  https://pypi.python.org/packages/source/t/trash-cli/trash-cli-0.12.9.14.tar.gz


ERROR: certificate common name `*.a.ssl.fastly.net' doesn't match requested host name `pypi.python.org'.

To connect to pypi.python.org insecurely, use `--no-check-certificate'.

Unable to establish SSL connection.
# wget --no-check-certificate https://pypi.python.org/packages/source/t/trash-cli/trash-cli-0.12.9.14.tar.gz


5. Save the downloaded file in different name:

Do you like to save different file name give the  -O option.
 
#  wget http://www.dsgnwrld.com/am/tomcat/tomcat-8/v8.0.11/bin/apache-tomcat-8.0.11.tar.gz -O tomcat-8.0.11.tar.gz


6. Continue the Incomplete Downloading file :

If a download file fails due to a network problem,  -c  option keep retrying to download until file has been retrieved. This option same like as a torrent tool.
 
#  wget -c http://www.dsgnwrld.com/am/tomcat/tomcat-8/v8.0.11/bin/apache-tomcat-8.0.11.tar.gz


7. Download Multiple file in a command:

Just give the space between the URL for download multiple files.
 
#  wget http://www.dsgnwrld.com/am/tomcat/tomcat-8/v8.0.11/bin/apache-tomcat-8.0.11.tar.gz    http://www.domainname.com/filepath/download.txt


8. Download a file in background.

May be a download file have more space retrieves in background using  -b option and the status stores in wget-log file.
 
#  wget -b  http://www.dsgnwrld.com/am/tomcat/tomcat-8/v8.0.11/bin/apache-tomcat-8.0.11.tar.gz


Continuing in background, pid 14119.

Output will be written to `wget-log'.

Do you want to see the download current status give the below command,
 
#  tail -f wget-log


  3400K .......... .......... .......... .......... .......... 38%  293K 16s

  3450K .......... .......... .......... .......... .......... 38%  521K 16s

  3500K .......... .......... .......... .......... .......... 39%  488K 16s

  3550K .......... .......... .......... .......... .......... 40%  331K 15s

  8950K .......... .......... .......... .......... ...       100% 1.67M=27s



2014-08-26 15:23:58 (330 KB/s) - `apache-tomcat-8.0.11.tar.gz' saved [9209021/9209021]


9. Set Downloading Speed:

-o  option set log for download status
--limit-rate  option to set download speed
 
#  wget  -o wget-log --limit-rate=50k http://www.dsgnwrld.com/am/tomcat/tomcat-8/v8.0.11/bin/apache-tomcat-8.0.11.tar.gz

View downloading logs
 
#  tail -f wget-log
 


  900K .......... .......... .......... .......... .......... 10% 52.1K 2m41s

   950K .......... .......... .......... .......... .......... 11% 39.1K 2m42s

  1000K .......... .......... .......... .......... .......... 11% 52.1K 2m40s

  1050K .......... .......... .......... .......... .......... 12% 52.1K 2m39s

  1100K .......... .......... .......... .......... .......... 12% 52.1K 2m38s

  1150K .......... .......... .......... .......... .......... 13% 52.1K 2m36s

Do you want to set background process give & symbol end of command,

 10. Get download log, background and speed limit:
 
#  wget -b -o wget-log --limit-rate=10k http://www.domainname.com/filepath/file.txt


11. Download multiple file from the url from text file:

Open a text file and add URL's
 
# vi  urlfile.txt

http://domainname1.com/filepath/file.txt
http://domainname2.com/filepath/file.txt
http://domainname3.com/filepath/file.txt

Finally, save and execute the below command:
 
# wget -i urlfile.txt

12. More wget help:
 
#wget --help