Chapter 3 Study Guide - Revision history

Litk0013 at 01:07, 3 February 2012

2012-02-03T01:07:12Z

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	'''*grep = See section "Search files for regular expressions using grep (Global Regular Expressions)" '''		'''*grep = See section "Search files for regular expressions using grep (Global Regular Expressions)" '''

			normal use of the grep command.
			grep searchtext filenames

			This is an example of a common usage of grep:
			grep apple fruitlist.txt

			An example of a search argument that has exact text with multiple words:
			grep "apple orange" fruitlist.txt

			An example of using grep to search multiple files- in this case, text files:
			grep apple *.txt

			Example of grep ignoring the case of the search:
			grep -i apple fruitlist.txt

			Line matches exactly - in this case the word apple is the only word on that line:
			grep - x apple fruitlist.txt

			Example of grep search that finds all lines that do not match:
			grep -v apple fruitlist.txt

			Examples of searching for text with spaces on either side:
			grep " apple " fruitlist.txt
			grep -w apple fruitlist.txt

			Example of searching with wildcards:
			grep " ap.le " fruitlist.txt

			Example of grep with extended regular expressions:
			egrep "(apple\|orange)" fruitlist.txt

	'''*file = Tells you if the object you are looking at is a file or if it is a directory. '''		'''*file = Tells you if the object you are looking at is a file or if it is a directory. '''

Randyoye: /* Key Commands */

2012-02-02T23:03:20Z

Key Commands

@@ Line 320: / Line 320: @@
 	And ls command is another useful used for listing files in a given directory.
-*cat
+'''*cat = used to create, display, copy, redirect output, and combine text file'''
 *cd (change directory)
-*egrep
+Syntax:
-*grep
+cat filename
-*file
+cat options filename
-*grep
+cat file1 file2
-*head
+cat file1 file2 > newcombinedfile
 *less
-*ls
+Example: read or read the contents of files, enter:
-*more
+$ cat /etc/passwd
-*pwd (print working directory)
-*strings
+Example:  The output from cat command is written to /tmp/text.txt file instead of being displayed on the monitor screen. You can view /tmp/text.txt using cat command itself:
-*tac
+$ cat /etc/passwd > /tmp/test.txt
-*tail
 ==Use vi to modify text files==
 ====source: http://www.cs.colostate.edu/helpdocs/vi.html====

Randyoye: /* Search files for regular expressions using grep */

2012-02-02T22:53:51Z

Search files for regular expressions using grep

← Older revision		Revision as of 22:53, 2 February 2012
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	*tac		*tac
	*tail		*tail
	~~==Search files for regular expressions using grep==~~
	==Use vi to modify text files==		==Use vi to modify text files==
	====source: http://www.cs.colostate.edu/helpdocs/vi.html====		====source: http://www.cs.colostate.edu/helpdocs/vi.html====

Tryder: /* Search files for regular expressions using grep (Global Regular Expressions) */

2012-02-02T19:16:14Z

Search files for regular expressions using grep (Global Regular Expressions)

← Older revision		Revision as of 19:16, 2 February 2012
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	'''Searching with extended regular expressions with egrep'''		'''Searching with extended regular expressions with egrep'''
	*egrep "(help\|hope)" (quotation, parenthesis, pipe, parenthesis, qotation)		*egrep "(help \| hope)" (quotation, parenthesis, help, space, pipe, space, hope, parenthesis, qotation)
	To view lines that contain the text "help" or "hope"		To view lines that contain the text "help" or "hope"

Tryder: /* Search files for regular expressions using grep */

2012-02-02T16:46:21Z

Search files for regular expressions using grep

← Older revision		Revision as of 16:46, 2 February 2012
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	==Regular Expressions==		==Regular Expressions==
	===Search files for regular expressions using grep===		===Search files for regular expressions using grep ''(Global Regular Expressions)''===
	*grep allows you to search through a file for text argument.		*grep allows you to search through a file for text argument.
	*grep "localhost" /etc/hosts		*grep "localhost" /etc/hosts
	~~return~~ lines that include localhost in the file /etc/hosts		return lines that include localhost in the file /etc/hosts
	*grep -v "localhost" /etc/hosts		*grep -v "localhost" /etc/hosts
	~~return~~ lines that DONT include localhost in the file /etc/hosts		return lines that DONT include localhost in the file /etc/hosts
	*grep -l "LOCALHOST" /etc/hosts		*grep -l "LOCALHOST" /etc/hosts
	~~return~~ lines that include localhost in the file /etc/hosts that is not case-sensitive		return lines that include localhost in the file /etc/hosts that is not case-sensitive
			*grep -i "text" "File"
			to search for text that is not case sensitive in a file since the default is case sensitive
			*grep "text" (quotation marks)
			will search for text patterns like: texting, subtext all consist of the word text
			*grep " text " (quotations with a space before and after)
			will search for the exact text in a line
			*grep " s.text " (quaotations with a space and a period)
			will search for any pattern of text that starts with the letter s and ends with text: subtext, supertext
			*grep "^T " (quotation, carat, space quotation)
			To view lines that start with the letter T

			'''Searching with extended regular expressions with egrep'''
			*egrep "(help\|hope)" (quotation, parenthesis, pipe, parenthesis, qotation)
			To view lines that contain the text "help" or "hope"

	===Commands to Display Contents of Binary Files===		===Commands to Display Contents of Binary Files===

Madi0081 at 02:46, 2 February 2012

2012-02-02T02:46:04Z

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	===gedit editor===		===gedit editor===
			*Default text editor for GNOME desktop environment.
			*Does not have the advanced functionality that vi or Emacs has.
			*Has ability to install additional Gedit plugins.
			*One of the easiest editors to use.

	===nano editor===		===nano editor===
			*Based on pine UNIX editor.
			*Provides shortcut hints at the bottom of the screen.
			*Has graphical text editor.

	==Summary==		==Summary==

Randyoye: /* Comparison of Windows v. Linux filesystems */

2012-02-01T01:08:52Z

Comparison of Windows v. Linux filesystems

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 ==Comparison of Windows v. Linux filesystems==
+====Windows File System Attributes====
 Navigate the directory structure using relative and absolute pathnames

Randyoye: /* Searching for Text within Files */

2012-02-01T00:59:22Z

Searching for Text within Files

← Older revision		Revision as of 00:59, 1 February 2012
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	===Searching for Text within Files===		===Searching for Text within Files===
	Tools: grep, awk, sed, vi, emacs, ex, ed, C++, PERL, tcl		*Tools: grep, awk, sed, vi, emacs, ex, ed, C++, PERL, tcl

	Regular expressions		*Regular expressions

	Wildcard metacharacters are interpreted by the shell		*Wildcard metacharacters are interpreted by the shell

	Regular expressions are interpreted by text tool program		*Regular expressions are interpreted by text tool program

	Wildcard metacharacters match characters in file & dir names		*Wildcard metacharacters match characters in file & dir names

	Regular expressions match charters within file		*Regular expressions match charters within file

	Wildcard metacharacters typically have different definitions than regular expressions		*Wildcard metacharacters typically have different definitions than regular expressions

	~~metacharacters~~		*metacharacters

	~~There are more regular expression metacharacters than wildcard~~ metacharacters

			*There are more regular expression metacharacters than wildcard metacharacters

	==Alternatives to vi==		==Alternatives to vi==

Randyoye: /* Emacs */

2012-02-01T00:57:21Z

Emacs

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	*Licensed GNU GPL		*Licensed GNU GPL
	*Users can combine commands into macros to automate task.		*Users can combine commands into macros to automate task.

			===gedit editor===
			===nano editor===

	==Summary==		==Summary==

Randyoye: /* Searching for Text within Files */

2012-02-01T00:55:30Z

Searching for Text within Files

← Older revision		Revision as of 00:55, 1 February 2012
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			==Alternatives to vi==
	===Emacs===		===Emacs===
	Not installed by default in Fedora 13.		*Not installed by default in Fedora 13.
			*Can run in a GUI environment.
	Can run in a GUI environment.		*More GUI than vi.
			*Written in C and Emacs Lisp.
	More GUI than vi.		*Licensed GNU GPL
			*Users can combine commands into macros to automate task.
	~~Written~~ in C and Emacs Lisp.

	~~Licensed~~ GNU GPL

	~~Users~~ can combine commands into macros to automate task.

	==Summary==		==Summary==