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80 lines
3.3 KiB
Markdown
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look : Linux Command To Verify Spellings And Display Lines Beginning With A String
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Have you ever felt the need of a command line utility in Linux through which you can verify spellings? A utility that can display lines in file which contain a particular string as a prefix? Well, in this article we will discuss the **look** command in Linux that is capable of doing both these tasks.
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### look Command In Linux ###
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Here is a snapshot of the description of look command from its man page :
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### Testing Environment ###
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- **OS** – Ubuntu 13.04
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- **Shell** – Bash 4.2.45
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- **Application** – look 2.20.1-5.1ubuntu8
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#### A Brief Tutorial ####
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Now lets discuss this command through some practical examples.
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Suppose you want to verify the spelling of the word rendezvous. You can do it easily using look command.
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Here is an example :
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$ look rendez
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rendezvous
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rendezvous's
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rendezvoused
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rendezvouses
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rendezvousing
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So as you can see, I just passed a few initial characters of the word as command line argument and the command produced all the related words. These words are fetched by the look command from the file **/usr/share/dict/words**.
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Another scenario could be the one in which it is required to print all the lines beginning with a particular string. For example, if I want to display all the header files that are included in a c file, I’d use the look command in the following way :
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$ look "#include" efence_test.c
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#include <stdio.h>
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#include <stdlib.h>
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So you can see that it produced all the lines in file efence_test.c that begin with the string “#include” and hence I got to know the header files included in this source file.
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By default, all the matching that the look command does is case-sensitive. You can opt for non-case-sensitive matching by using the **-f option**.
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Here are some other command line options that the look command provides :
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For more information on this command, read its [man page][1].
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#### Download/Install/Configure ####
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Here are some of the important links related to the look command :
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- Home Page [*Let me know if you find home page of this utility*]
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- Download Link
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The look command comes as a part of **util-linux** package which is pre-installed in most of the Linux distributions.
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#### Pros ####
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- Easily verify spellings from command line
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- Comes pre-installed in most of the Linux distributions
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#### Cons ####
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- Depends on /usr/share/dict/words for spelling verification.
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#### Conclusion ####
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An excellent command line utility to verify spellings. Saves a lot of time if you want to display lines beginning with a particular string. Try it, you’ll definitely like it.
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--------------------------------------------------------------------------------
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via: http://mylinuxbook.com/look-verify-spellings-and-display-lines/
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译者：[译者ID](https://github.com/译者ID) 校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[1]:http://linux.about.com/library/cmd/blcmdl1_look.htm
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