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Overview About Wget Command

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What is use for Wget Command?

wget utility is the best option to download files from internet.
wget can pretty much handle all complex download situations including large file downloads, recursive downloads, non-interactive downloads, multiple file downloads etc.

Some of the examples for how to download using wget

1) How to download a single file with using wget

$ wget http://www.openss7.org/repos/tarballs/strx25-0.9.2.1.tar.bz2

The above example downloads a single file from internet and stores in the current directory.

2) How to download and store with a different File name Using wget -O

$ wget -O taglist.zip http://www.vim.org/scripts/download_script.php?src_id=7701

3) How to Specify Download Speed / Download Rate Using wget –limit-rate

$ wget --limit-rate=200k http://www.openss7.org/repos/tarballs/strx25-0.9.2.1.tar.bz2

In the above example, the download speed is limited to 200k.

4) How to Continue the Incomplete Download Using wget -c

$ wget -c http://www.openss7.org/repos/tarballs/strx25-0.9.2.1.tar.bz2

5) How to Download in the Background Using wget -b

$ wget -b http://www.openss7.org/repos/tarballs/strx25-0.9.2.1.tar.bz2

6) How to Test Download URL Using wget –spider

$ wget --spider DOWNLOAD-URL

7)How to Increase Total Number of Retry Attempts Using wget –tries

$ wget --tries=75 DOWNLOAD-URL

8) How to Download Multiple Files / URLs Using Wget -i

First, store all the download files or URLs in a text file as:

$ cat > download-file-list.txt
URL1
URL2
URL3
URL4

Next, give the download-file-list.txt as argument to wget using -i option as shown below.

$ wget -i download-file-list.txt

9)How to Download a Full Website Using wget –mirror

$ wget --mirror -p --convert-links -P ./LOCAL-DIR WEBSITE-URL

10) How to Quit Downloading When it Exceeds Certain Size Using wget -Q

$ wget -Q5m -i FILE-WHICH-HAS-URLS

11)FTP Download With wget

$ wget --ftp-user=USERNAME --ftp-password=PASSWORD DOWNLOAD-URL

12)How to Reject Certain File Types while Downloading Using wget –reject

$ wget --reject=gif WEBSITE-TO-BE-DOWNLOADED

13)Log messages to a log file instead of stderr Using wget -o

$ wget -o download.log DOWNLOAD-URL
posted Aug 8, 2014 by Manish Tiwari

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What is man command ?

man is the interface used to view the system's reference manuals.

man is the system's manual viewer; it can be used to display manual pages, scroll up and down, search for occurrences of specific text, and other useful functions.

To use the man command, at the Unix prompt, enter:

man search_topic

For example you need to find information about grep.You can use the following command and get the grep detail information

man grep

Some of the General options

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-d, --debug Print debugging information.
-D, --default This option, when used, is normally specified as the first option; it resets man's behaviour to its default. Its use is to reset those options that may have been set in $MANOPT. Any options that follow -D will have their usual effect.
--warnings[=warnings] Enable warnings from the groff text formatter. This may be used to perform sanity checks on the source text of manual pages. warnings is a comma-separated list of warning names; if it is not supplied, the default is "mac". See the "Warnings" node in the groff info page for a list of available warning names.

Check here for more details about options - http://www.computerhope.com/unix/uman.htm

Video tutorial for Man Command

https://www.youtube.com/watch?v=xpJ8NyeOgbQ

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What is Grep Command?

The grep command allows you to search one file or multiple files for lines that contain a pattern.

If Grep is not installed in your system you can install by using the following command.

$ sudo apt-get install grep         #Debian/Ubuntu

$ sudo yum install grep             #RHEL/CentOS/Fedora

Syntax For Grep Commands

grep [options] pattern [files]

Option Description

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Here Some of the examples for using Grep

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grep "String_name" filename

2)How to Search a String in Multiple File

grep "string" FILE_PATTERN

The Above example will used to search the string in multiple files.For Example,We have 2 text files named as textfile1 and textfile2.

Now the following command will use to search the string in these two text files

  grep "search_string"  text*

3)How will do Case insensitive search

Using -i option you can do the case insensitive search.

Syntax

grep -i  "string"  Filename

4)How search a string in recursively

Using -r option will do the recursive search.

grep -r  "string" *

5)How to count the number of Matches

Using -c option you can count the number of matches.

grep -c "string" Filename
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What is nano?

nano is a text editor for Unix-like computing systems or operating environments using a command line interface. It emulates the Pico text editor, part of the Pine email client, and also provides additional functionality.

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Command for Starting nano editor

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Editor Window
enter image description here

Command line Options

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-A, --smarthome
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Use bold text instead of reverse video text.
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Convert typed tabs to spaces.
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More Reference click here -> http://mintaka.sdsu.edu/reu/nano.html

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In Unix, the shell is a program that interprets commands and acts as an intermediary between the user and the inner workings of the operating system.

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It makes basic facilities such as multitasking and piping easy to use, and it adds useful file-specific features such as wildcards and I/O redirection.

Shell Prompt:

The prompt, $, which is called command prompt, is issued by the shell. While the prompt is displayed, you can type a command.

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Simple Example

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Reletionship Diagram for above four shells
enter image description here

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If you have a % prompt, you’re probably in a C shell.

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