Awk - Revision history

Admin: /* Variables */

2018-05-16T03:56:07Z

Variables

← Older revision		Revision as of 03:56, 16 May 2018
Line 50:		Line 50:
	<code> , </code> a comma represents a space.		<code> , </code> a comma represents a space.
	Example: <code>awk '{print$2,$4}'</code> will print the 2nd column, a space, then the 4th column		Example: <code>awk '{print$2,$4}'</code> will print the 2nd column, a space, then the 4th column


			<code> "String" </code> - prints the given string (remember to put the string inside double-quotes)

	== References ==		== References ==

Admin: /* Operators */

2018-05-16T03:47:00Z

Operators

← Older revision		Revision as of 03:47, 16 May 2018
Line 29:		Line 29:


	== ~~Operators~~ ==		== Variables ==

	<code> \ </code> ~~The \ tells~~ awk ~~that a special character follows~~ the ~~slash, and to interpret it differently than regular text~~<br />		<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.<br />
	Example: <code> \t </code> ~~means a tab character~~		Example: <code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen


Line 39:		Line 39:


	<code> ' </code> ~~(single-quote) Specify~~ awk ~~commands inside single quotes at~~ the ~~command line.~~<br />		<code> $NF </code> The last field or column. Useful in, say, domlogs, where the IP might be the last column, but might be in the 5th column on some lines, or the 6th on others. You can use $NF to still pull it.
	Example: <code>~~awk '{print}' file.txt~~</code> ~~prints the contents of file.txt to the screen~~

			<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text<br />
			Example:<br/>
			<code> \t </code> means a tab character<br />
			<code> \n </code> a new line


	<code></code>		<code> , </code> a comma represents a space.
			Example: <code>awk '{print$2,$4}'</code> will print the 2nd column, a space, then the 4th column

	== References ==		== References ==

Admin at 17:13, 30 December 2016

2016-12-30T17:13:39Z

← Older revision		Revision as of 17:13, 30 December 2016
Line 7:		Line 7:
	'''Example:'''		'''Example:'''

	<code>~~example here, if I can figure it out~~...</code>		<code>awk '{print}' file.txt</code> prints all of file.txt


			<code>awk '{print $3 "\t" $5}' file.txt</code> prints just the third, and fifth columns of file.txt, separated by a tab.

Admin at 16:56, 30 December 2016

2016-12-30T16:56:04Z

← Older revision		Revision as of 16:56, 30 December 2016
Line 28:		Line 28:

	<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text<br />		<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text<br />
	Example:~~<br />~~		Example: <code> \t </code> means a tab character
	<code> \t </code> means a tab character


	<code> $ </code> field (column) reference<br />		<code> $ </code> field (column) reference<br />
	Example:~~<br />~~		Example: <code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)
	<code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)


	<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.<br />		<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.<br />
	Example:~~<br />~~		Example: <code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen
	<code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen

Admin at 16:55, 30 December 2016

2016-12-30T16:55:23Z

← Older revision		Revision as of 16:55, 30 December 2016
Line 30:		Line 30:
	Example:<br />		Example:<br />
	<code> \t </code> means a tab character		<code> \t </code> means a tab character


	<code> $ </code> field (column) reference<br />		<code> $ </code> field (column) reference<br />
	Example:<br />		Example:<br />
	<code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)		<code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)


	<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.<br />		<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.<br />
	Example:<br />		Example:<br />
	<code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen		<code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen


	<code></code>		<code></code>

Admin at 16:54, 30 December 2016

2016-12-30T16:54:52Z

← Older revision		Revision as of 16:54, 30 December 2016
Line 27:		Line 27:
	== Operators ==		== Operators ==

	<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text		<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text<br />
	Example:		Example:<br />
	<code> \t </code> means a tab character		<code> \t </code> means a tab character

	<code> $ </code> field (column) reference		<code> $ </code> field (column) reference<br />
	Example:		Example:<br />
	<code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)		<code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)

	<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.		<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.<br />
	Example:		Example:<br />
	<code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen		<code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen

Admin at 16:54, 30 December 2016

2016-12-30T16:54:05Z

← Older revision		Revision as of 16:54, 30 December 2016
Line 4:		Line 4:

	<code>awk <i>pattern</i> {<i>action</i>}</code>		<code>awk <i>pattern</i> {<i>action</i>}</code>

			'''Example:'''

			<code>example here, if I can figure it out...</code>


	== Structure ==		== Structure ==

	<code>BEGIN</code> The begin block runs at the start of the awk program, and runs only once.		'''BEGIN'''

			<code>BEGIN</code> The begin block runs at the start of the awk program, and runs only once. The body block is optional.

			'''BODY'''

			<code>/pattern/ {awk-commands}</code> The body block runs on every line of text (this can be restricted with patterns.) There is no keyword for this block.

			END

			<code>END {awk-commands}</code> The END command runs once at the end of the program.


Line 13:		Line 28:

	<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text		<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text
			Example:
	Example: <code> \t </code> means a tab character		<code> \t </code> means a tab character

	<code> $ </code> field (column) reference		<code> $ </code> field (column) reference
			Example:
			<code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)

	~~Example:~~ <code>$2</code> ~~tells awk to do something to the 2nd field~~ (~~column~~) ~~of the input. (Note that~~ awk ~~does not interpret variables~~ inside ~~strings~~.)		<code> ' </code> (single-quote) Specify awk commands inside single quotes at the command line.
			Example:
	~~<code></code>~~		<code>awk '{print}' file.txt</code> prints the contents of file.txt to the screen

	<code></code>

	<code></code>		<code></code>

Admin at 16:42, 30 December 2016

2016-12-30T16:42:06Z

← Older revision		Revision as of 16:42, 30 December 2016
Line 4:		Line 4:

	<code>awk <i>pattern</i> {<i>action</i>}</code>		<code>awk <i>pattern</i> {<i>action</i>}</code>

			== Structure ==

			<code>BEGIN</code> The begin block runs at the start of the awk program, and runs only once.


			== Operators ==

	<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text		<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text
Line 11:		Line 18:
	<code> $ </code> field (column) reference		<code> $ </code> field (column) reference

	Example: <code>$2</code> tells awk to do something to the 2nd field (column) of the input		Example: <code>$2</code> tells awk to do something to the 2nd field (column) of the input. (Note that awk does not interpret variables inside strings.)

	<code></code>		<code></code>

Admin at 16:10, 30 December 2016

2016-12-30T16:10:57Z

← Older revision		Revision as of 16:10, 30 December 2016
Line 4:		Line 4:

	<code>awk <i>pattern</i> {<i>action</i>}</code>		<code>awk <i>pattern</i> {<i>action</i>}</code>

			<code> \ </code> The \ tells awk that a special character follows the slash, and to interpret it differently than regular text

			Example: <code> \t </code> means a tab character

			<code> $ </code> field (column) reference

			Example: <code>$2</code> tells awk to do something to the 2nd field (column) of the input

			<code></code>

			<code></code>

			<code></code>

	== References ==		== References ==

Admin at 22:20, 29 December 2016

2016-12-29T22:20:08Z

← Older revision		Revision as of 22:20, 29 December 2016
Line 1:		Line 1:
			awk parses reports, among other text manipulation

			Usage:

			<code>awk <i>pattern</i> {<i>action</i>}</code>

	== References ==		== References ==
Line 5:		Line 9:
	<ol>		<ol>
	<li>[http://man.he.net/?topic=awk&section=all awk man page]</li>		<li>[http://man.he.net/?topic=awk&section=all awk man page]</li>
			<li>[http://www.grymoire.com/Unix/Awk.html awk tutorial]</li>
	</ol>		</ol>