Bash Shell - Revision history

Leo: /* See Also */

2020-06-14T23:24:23Z

Leo: Import WP content from http://leo.steamr.com/2011/02/disable-putty-ctrl-s-xoff/

2019-09-12T03:27:51Z

Import WP content from http://leo.steamr.com/2011/02/disable-putty-ctrl-s-xoff/

@@ Line 120: / Line 120: @@
 == Prompt ==
 The shell prompt can be set by changing the {{code|PS1}} environment variable.
 == See Also ==

Leo: /* Redirection */

2019-09-12T02:49:13Z

Redirection

← Older revision		Revision as of 02:49, 12 September 2019
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	== Redirection ==		== Redirection ==
			Standard Out and Standard Error represents a file descriptor on the system. Messages are typically sent to standard out for the user to see while errors are sent to standard error so that users can see errors even if a command's output is piped elsewhere.

			Standard out and standard error are just file descriptors the kernel sets up on start up and always have file descriptor 1 and 2 respectively. You can verify this by listing the two devices in {{code\|/dev}}.
			{{highlight\|lang=terminal\|code=
			$ ls -al /dev/std*
			lrwxrwxrwx 1 root root 15 Sep 10 13:32 /dev/stderr -> /proc/self/fd/2
			lrwxrwxrwx 1 root root 15 Sep 10 13:32 /dev/stdin -> /proc/self/fd/0
			lrwxrwxrwx 1 root root 15 Sep 10 13:32 /dev/stdout -> /proc/self/fd/1
			}}

			In a shell, you can redirect these standard messages to another file descriptor with the {{code\|>}} operator. You reference another file descriptor with the {{code\|&}} followed by the file descriptor number. Applying this, you could:

	{\| class="wikitable"		{\| class="wikitable"
Line 100:		Line 111:
	\|}		\|}

	If you wish to redirect both STDERR and STDOUT, you need to redirect STDOUT and then STDERR like so:		If you wish to redirect both STDERR and STDOUT, you need to redirect STDOUT and then STDERR exactly like this:

	{{highlight\|lang=terminal\|code=		{{highlight\|lang=terminal\|code=
	# ./some-program > /dev/null 2>&1		# ./some-program > /dev/null 2>&1
	}}		}}

			The ordering of the redirection matters.

	== Prompt ==		== Prompt ==

Leo: Text replacement - "Category:Linux{{Navbox Linux}}" to "{{Navbox Linux}}Category:Linux"

2019-09-01T06:22:40Z

Text replacement - "Category:Linux{{Navbox Linux}}" to "{{Navbox Linux}}Category:Linux"

← Older revision		Revision as of 06:22, 1 September 2019
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	* http://ss64.com/bash/syntax-keyboard.html		* http://ss64.com/bash/syntax-keyboard.html

	[[Category:Linux]]~~{{Navbox Linux}}~~		{{Navbox Linux}}[[Category:Linux]]

Leo: Text replacement - "{{Navbox Linux}}{{Navbox Linux}}" to "{{Navbox Linux}}"

2019-09-01T05:10:57Z

Text replacement - "{{Navbox Linux}}{{Navbox Linux}}" to "{{Navbox Linux}}"

← Older revision		Revision as of 05:10, 1 September 2019
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	* http://ss64.com/bash/syntax-keyboard.html		* http://ss64.com/bash/syntax-keyboard.html

	[[Category:Linux]]~~{{Navbox Linux}}~~{{Navbox Linux}}		[[Category:Linux]]{{Navbox Linux}}

Leo: Text replacement - "Category:Linux" to "Category:Linux{{Navbox Linux}}"

2019-09-01T05:08:37Z

Text replacement - "Category:Linux" to "Category:Linux{{Navbox Linux}}"

← Older revision		Revision as of 05:08, 1 September 2019
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	* http://ss64.com/bash/syntax-keyboard.html		* http://ss64.com/bash/syntax-keyboard.html

	[[Category:Linux]]{{Navbox Linux}}		[[Category:Linux]]{{Navbox Linux}}{{Navbox Linux}}

Leo: formatting

2019-09-01T02:26:39Z

formatting

← Older revision		Revision as of 02:26, 1 September 2019
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	Bash, short for the '''B'''ourne '''A'''gain '''Sh'''ell, is a popular interactive shell for Unix based systems and is the default for many distributions.		Bash, short for the '''B'''ourne '''A'''gain '''Sh'''ell, is a popular interactive shell for Unix based systems and is the default for many distributions.

	This article will go over some tips and tricks on using Bash interactively. For more information on scripting in Bash, see [[Bash Scripting]].		This article will go over some tips and tricks on using Bash interactively. For more information on scripting in Bash, see [[Bash Scripting]].
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	== Prompt ==		== Prompt ==
	The shell prompt can be set by changing the {{code\|PS1}} environment variable. ~~This is my colored prompt:~~		The shell prompt can be set by changing the {{code\|PS1}} environment variable.

	~~<phorkie>https://phorkie.leo.home.steamr.com/12/embed</phorkie>~~

	== See Also ==		== See Also ==
	* http://ss64.com/bash/syntax-keyboard.html		* http://ss64.com/bash/syntax-keyboard.html

	[[Category:Linux]]		[[Category:Linux]]{{Navbox Linux}}

Leo: /* Redirection */

2019-07-29T20:47:14Z

Redirection

← Older revision		Revision as of 20:47, 29 July 2019
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	{\| class="wikitable"		{\| class="wikitable"
	\| 2>&1		\| {{code\|2>&1}}
	\| STDERR to STDOUT		\| STDERR to STDOUT
	\|-		\|-
	\| &>		\| {{code\|&>}}
	\| Redirect both STDERR and STDOUT		\| Redirect both STDERR and STDOUT
	\|}		\|}

			If you wish to redirect both STDERR and STDOUT, you need to redirect STDOUT and then STDERR like so:

			{{highlight\|lang=terminal\|code=
			# ./some-program > /dev/null 2>&1
			}}

	== Prompt ==		== Prompt ==

Leo: /* Test */ Moved to Bash Scripting

2019-05-24T19:55:34Z

Test: Moved to Bash Scripting

@@ Line 99: / Line 99: @@
 | Redirect both STDERR and STDOUT
 |}
 == Prompt ==

Leo at 19:54, 24 May 2019

2019-05-24T19:54:06Z

@@ Line 99: / Line 99: @@
 | Redirect both STDERR and STDOUT
 |}
 == Prompt ==

← Older revision		Revision as of 23:24, 14 June 2020
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	{{Navbox Linux}}[[Category:Linux]]		{{Navbox Linux}}[[Category:Linux]]
			[[Category:LinuxUtilities]]