CLI I/O Redirection - Revision history

Laurel: class not currently offered

2010-07-31T21:40:31Z

class not currently offered

2008-04-19T20:01:24Z

2008-03-29T19:29:13Z

Examples

2008-03-29T19:28:47Z

Examples

2008-03-22T19:55:52Z

Abbreviations

2008-03-22T19:46:42Z

2008-03-22T19:34:50Z

2008-03-08T20:43:24Z

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[[Category:CLI Quizes]]
[[Category:Classes]]

← Older revision		Revision as of 21:40, 31 July 2010
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		+	This class is not currently offered. [[User:Laurel\|Laurel]] 21:40, 31 July 2010 (UTC)
		+
	== Introduction ==		== Introduction ==
	The Command Line Interface (CLI) provides three types of input/output (I/O) flow.		The Command Line Interface (CLI) provides three types of input/output (I/O) flow.

@@ Line 24: / Line 24: @@
 == Examples ==
-The user is attempting to list the contents of two directories, '/' and '/dirdoesnotexist/'. The '/' directory is valid and the command will succeed to list its contents. The '/dirdoesnotexist/' directory does not exist, as its name implies, and the command will fail to list its contents. Notice in the output there is both the text for the success and the failure.
+In this example the user is attempting to list the contents of two directories, '/' and '/dirdoesnotexist/'. The '/' directory is valid and the command will succeed to list its contents. The '/dirdoesnotexist/' directory does not exist, as its name implies, and the command will fail to list its contents. Notice in the output there is both the text for the success and the failure.
   diskless241@gimpy:~$ ls / /dirdoesnotexist

← Older revision		Revision as of 19:28, 29 March 2008
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	== Examples ==		== Examples ==
		+	The user is attempting to list the contents of two directories, '/' and '/dirdoesnotexist/'. The '/' directory is valid and the command will succeed to list its contents. The '/dirdoesnotexist/' directory does not exist, as its name implies, and the command will fail to list its contents. Notice in the output there is both the text for the success and the failure.
		+
		+	diskless241@gimpy:~$ ls / /dirdoesnotexist
		+	ls: /dirdoesnotexist: No such file or directory
		+	/:
		+	bin cdrom etc initrd initrd.img.old lib64 media opt root selinux sys usr vmlinuz
		+	boot dev home initrd.img lib lost+found mnt proc sbin srv tmp var vmlinuz.old
		+
		+	If we redirect the stdio to /dev/null we will no longer see it on the screen. We will be left with only the stderr on the console.
		+
		+	diskless241@gimpy:~$ ls / /dirdoesnotexist 1> /dev/null
		+	ls: /dirdoesnotexist: No such file or directory
		+
		+	Inversely, if we redirect the stderr to /dev/null we will no longer see it on the screen. We will be left with only the stdio on the console.
		+
		+	diskless241@gimpy:~$ ls / /dirdoesnotexist 2> /dev/null
		+	/:
		+	bin cdrom etc initrd initrd.img.old lib64 media opt root selinux sys usr vmlinuz
		+	boot dev home initrd.img lib lost+found mnt proc sbin srv tmp var vmlinuz.old

	== Quiz ==		== Quiz ==

← Older revision		Revision as of 19:55, 22 March 2008
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	== Abbreviations ==		== Abbreviations ==
		+
		+	=== stdio ===
		+	< = Send to
		+
		+	=== stdout ===
		+	1> = Redirect stdout, overwrite specified file
		+	1>> = Redirect stdout, append specified file
		+
		+	=== stderr ===
		+	2> = Redirect stderr, overwrite specified file
		+	2>> = Redirect stderr, append specified file

	== Examples ==		== Examples ==

← Older revision		Revision as of 19:46, 22 March 2008
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	== Introduction ==		== Introduction ==
		+	The Command Line Interface (CLI) provides three types of input/output (I/O) flow.
		+
		+	# stdin = "Standard In;" input passed to a command
		+	# stdout = "Standard Out;" output from a command
		+	# stderr = "Standard Error;" error output from a command
		+
		+	This means that there are two types of output from any command stdout and stderr. It also means that you can separate them.

	== Commands ==		== Commands ==

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 == Quiz ==
 [[Category:CLI Quizes]]
 [[Category:Classes]]