Command that makes a guess about the file content

Last Updated on Friday, 01 April 2011 18:26

Question:
What is the exact command that makes a guess about the content of a file "instructions" without displaying that content?

Answer:

file

A command file takes a best guess about a file content.
NOTE: file command does not rely on a file extention.

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Command to locate the word within a text file

Last Updated on Friday, 01 April 2011 18:27

Question:
Give the exact command that can locate the word "to" (without quotes) in a file named "file1" (without quotes), but does not display words like "total" or "stone" that are in the same file.

Answer:
-w option of a grep commad allows user to search a content of a file for a words, where word is separated on both sides by a white space.

grep -w to file1

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Keyword search in the online manual

Last Updated on Friday, 01 April 2011 18:27

Question:
Do a keyword (-k) search in the online manual for the word "grep". How many man PAGES are there where the word "grep" appears? What command did you use to get the result?

Answer:

To search for a specific keyword within online manual pages we can use a man -k command. For exmaple to search for a keyword grep we use:

man -k grep

another alternative to man command is apropos command:

apropos -k grep

Both commands will return the same number of results.

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Differences between the cat and ls utilities

Last Updated on Friday, 01 April 2011 18:27

Question:
What are the differences between the cat and ls utilities, with respect to file content?

Answer:
ls without any arguments will return a file name and thus it does not directly read a content of the file. Whereas cat will return a content of a file.

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