Bash Script Knowledge Base - Versionsgeschichte

Matt: /* Working with Dates */

2025-10-18T15:29:06Z

Working with Dates

← Nächstältere Version		Version vom 18. Oktober 2025, 17:29 Uhr
Zeile 23:		Zeile 23:
	To have it work on a different reference date use:		To have it work on a different reference date use:
	date -d '2025-12-24' '+%m/%d/%Y'		date -d '2025-12-24' '+%m/%d/%Y'
			For further variables see https://man7.org/linux/man-pages/man1/date.1.html

	Output:		Output:
	12/24/2025		12/24/2025
	~~For further variables see https://man7.org/linux/man-pages/man1/date.1.html~~

	Save the output in a variable in a bash script and print it out and also print it out directly:<syntaxhighlight lang="bash" line="1">#!/bin/bash		Save the output in a variable in a bash script and print it out and also print it out directly:<syntaxhighlight lang="bash" line="1">#!/bin/bash
	MONTH=$(date '+%Y-%m')		MONTH=$(date '+%Y-%m')

2025-09-28T23:00:24Z

Working with Dates

← Nächstältere Version		Version vom 29. September 2025, 01:00 Uhr
Zeile 27:		Zeile 27:
	For further variables see https://man7.org/linux/man-pages/man1/date.1.html		For further variables see https://man7.org/linux/man-pages/man1/date.1.html

	Save the output in a variable in a bash script and print it out:<syntaxhighlight lang="bash" line="1">#!/bin/bash		Save the output in a variable in a bash script and print it out and also print it out directly:<syntaxhighlight lang="bash" line="1">#!/bin/bash
	MONTH=$(date '+%Y-%m')		MONTH=$(date '+%Y-%m')
	echo "*$MONTH*"		echo "*$MONTH*"

2025-09-28T22:59:42Z

Working with Dates

← Nächstältere Version		Version vom 29. September 2025, 00:59 Uhr
Zeile 29:		Zeile 29:
	Save the output in a variable in a bash script and print it out:<syntaxhighlight lang="bash" line="1">#!/bin/bash		Save the output in a variable in a bash script and print it out:<syntaxhighlight lang="bash" line="1">#!/bin/bash
	MONTH=$(date '+%Y-%m')		MONTH=$(date '+%Y-%m')
	echo "*$MONTH*"</syntaxhighlight>Output as of the time of writing:		echo "*$MONTH*"
			echo "*$(date '+%m/%d/%Y')*"</syntaxhighlight>Output as of the time of writing:
	*2025-09*		*2025-09*
			*09/29/2025*

	== Check if Bash Script Received Parameters ==		== Check if Bash Script Received Parameters ==

2025-09-28T22:55:31Z

Working with Dates

← Nächstältere Version		Version vom 29. September 2025, 00:55 Uhr
Zeile 26:		Zeile 26:
	12/24/2025		12/24/2025
	For further variables see https://man7.org/linux/man-pages/man1/date.1.html		For further variables see https://man7.org/linux/man-pages/man1/date.1.html

			Save the output in a variable in a bash script and print it out:<syntaxhighlight lang="bash" line="1">#!/bin/bash
			MONTH=$(date '+%Y-%m')
			echo "*$MONTH*"</syntaxhighlight>Output as of the time of writing:
			*2025-09*

	== Check if Bash Script Received Parameters ==		== Check if Bash Script Received Parameters ==

2025-09-28T22:40:05Z

@@ Zeile 13: / Zeile 13: @@
   echo $HW
 Source: https://www.geeksforgeeks.org/bash-script-working-of-bash-variables/
 == Check if Bash Script Received Parameters ==
@@ Zeile 40: / Zeile 53: @@
 [[Kategorie:Terminal]]
 [[Kategorie:Linux]]

2025-05-15T15:05:59Z

← Nächstältere Version		Version vom 15. Mai 2025, 17:05 Uhr
Zeile 30:		Zeile 30:
	fi		fi
	The <code>-z</code> switch will test, if the argument passed is empty. If it is empty, then the expression resolves to true and the body of the if statement is executed.		The <code>-z</code> switch will test, if the argument passed is empty. If it is empty, then the expression resolves to true and the body of the if statement is executed.


			Sources:

			https://stackoverflow.com/questions/6482377/check-existence-of-input-argument-in-a-bash-shell-script

			https://www.w3schools.com/bash/bash_conditions.php

	[[Kategorie:Terminal]]		[[Kategorie:Terminal]]
	[[Kategorie:Linux]]		[[Kategorie:Linux]]

2025-05-15T15:02:15Z

← Nächstältere Version		Version vom 15. Mai 2025, 17:02 Uhr
Zeile 12:		Zeile 12:
	Read content of the variable and put it to the console:		Read content of the variable and put it to the console:
	echo $HW		echo $HW
			Source: https://www.geeksforgeeks.org/bash-script-working-of-bash-variables/

	== Check if Bash Script Received Parameters ==		== Check if Bash Script Received Parameters ==

2025-05-15T14:58:02Z

Check if Bash Script Received Parameters

← Nächstältere Version		Version vom 15. Mai 2025, 16:58 Uhr
Zeile 15:		Zeile 15:
	== Check if Bash Script Received Parameters ==		== Check if Bash Script Received Parameters ==
	Check if any arguments were passed to the script:		Check if any arguments were passed to the script:
	if [ $# -eq 0 ] then		if [ $# -eq 0 ]; then
	echo "No arguments received"		echo "No arguments received"
			else
			echo "Arguments received"
	fi		fi
	<code>$#</code> contains how many arguments were passed to the script.		<code>$#</code> contains how many arguments were passed to the script.

	Check if first argument was empty:		Check if first argument was empty:
	if [ -z "$1" ] then		if [ -z "$1" ]; then
	echo "Argument 1 empty"		echo "Argument 1 empty"
			else
			echo "Argument 1 is $1"
	fi		fi
	The <code>-z</code> switch will test, if the argument passed is empty. If it is empty, then the expression resolves to true and the body of the if statement is executed.		The <code>-z</code> switch will test, if the argument passed is empty. If it is empty, then the expression resolves to true and the body of the if statement is executed.

2025-05-13T15:07:17Z

← Nächstältere Version		Version vom 13. Mai 2025, 17:07 Uhr
Zeile 1:		Zeile 1:
	This article holds some notes about scriping in bash.		This article holds some notes about scriping in bash.


			Siehe auch: [[Shell-Skript How-To (Linux)]]
	== General ==		== General ==
	A bash script starts in the first line with:		A bash script starts in the first line with:
Zeile 24:		Zeile 27:

	[[Kategorie:Terminal]]		[[Kategorie:Terminal]]
			[[Kategorie:Linux]]

2025-05-12T19:39:57Z

← Nächstältere Version		Version vom 12. Mai 2025, 21:39 Uhr
Zeile 1:		Zeile 1:
	This article holds some notes about scriping in bash.		This article holds some notes about scriping in bash.



	~~STR="Hello World!"~~

	~~echo $STR~~

	== General ==		== General ==
	A bash script starts in the first line with:		A bash script starts in the first line with: