Bash-common-checks - Revision history

Chubbard: /* Function return code examples */

2024-07-08T13:31:42Z

Function return code examples

@@ Line 161: / Line 161: @@
 $ echo $?
 </pre>
 [[Category: Bash]]

2024-07-08T13:29:23Z

Stupid loop I keep forgetting

← Older revision		Revision as of 06:29, 8 July 2024
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	</pre>		</pre>

			====Function return code examples====
			[https://stackoverflow.com/questions/17336915/return-value-in-a-bash-function\| Stack Overflow source]
			<pre>
			#!/bin/bash -e
			function func1() {
			return ${1:-0}
			}

			function func2() {
			local RVAL=""
			RVAL=$(func1 ${1:-0} && echo 0 \|\| echo $?)
			if [[ $RVAL != "0" ]]; then
			echo "Some logic on exit code $RVAL"
			exit $RVAL
			fi
			echo "Some logic on exit code 0"
			}

			func2 ${1:-0}
			Some basic tests

			$ ./test.sh
			Some logic on exit code 0
			$ echo $?
			0
			$ ./test.sh 128
			Some logic on exit code 128
			$ echo $?
			128
			</pre>
	[[Category: Bash]]		[[Category: Bash]]

2024-04-25T21:54:30Z

← Older revision		Revision as of 14:54, 25 April 2024
Line 1:		Line 1:
			<metadesc>Somewhat uncommon bash commands to use in formatting or logic in a bash script.</metadesc>
	===Common checks and validations that are a PITA to remember===		===Common checks and validations that are a PITA to remember===
	====Is Integer?====		====Is Integer?====

2024-04-25T18:46:27Z

Make leading zeros for output

← Older revision		Revision as of 11:46, 25 April 2024
Line 124:		Line 124:
	02		02
	</pre>		</pre>

			====Stupid loop I keep forgetting====
			Used for renaming television episodes when what you think is a season does not match what tbdb thinks is a season
			<pre>
			for x in $(seq 1 12); do z=$(( $x + 12 )); y=$(printf "%02d" $x) ; s2='s02e' ; s1='s01e'; if=$(ls ./$s2$y) ; fn=$(echo $if \| sed "s/$s2$y/$s1$z/") ; mv $if $fn ; done
			</pre>

	[[Category: Bash]]		[[Category: Bash]]

2022-01-26T02:51:30Z

Make leading zeros for output

← Older revision		Revision as of 19:51, 25 January 2022
Line 121:		Line 121:
	* change the % values for things such as decimal precision or more leading numbers		* change the % values for things such as decimal precision or more leading numbers
	<pre>		<pre>
	$printf "%02d" 2)		$(printf "%02d" 2)
			02
	</pre>		</pre>
	[[Category: Bash]]		[[Category: Bash]]

2022-01-26T02:50:56Z

← Older revision		Revision as of 19:50, 25 January 2022
Line 117:		Line 117:
	</pre>		</pre>

			====Make leading zeros for output ====
			* make 2 say 02 instead
			* change the % values for things such as decimal precision or more leading numbers
			<pre>
			$printf "%02d" 2)
			</pre>
	[[Category: Bash]]		[[Category: Bash]]

2021-10-20T18:57:27Z

@@ Line 106: / Line 106: @@
 BDB2
 </pre>
 [[Category: Bash]]

2021-10-20T18:54:29Z

=Generate HEX for string

← Older revision		Revision as of 11:54, 20 October 2021
Line 99:		Line 99:
	1624d322		1624d322
	</pre>		</pre>
	====Generate HEX for string===		====Generate HEX for string====
	* Note this is not able to do the reverse		* Note this is not able to do the reverse
	* No found method to convert the output back to LongString so this is buggy		* No found method to convert the output back to LongString so this is buggy

2021-10-20T18:54:18Z

← Older revision		Revision as of 11:54, 20 October 2021
Line 98:		Line 98:
	crc32 <(echo "LongString")		crc32 <(echo "LongString")
	1624d322		1624d322
			</pre>
	~~Or:~~		====Generate HEX for string===
			* Note this is not able to do the reverse
			* No found method to convert the output back to LongString so this is buggy
			<pre>
	echo -n "LongString" \| cksum \| cut -d " " -f1 \| xargs echo printf '%0X\\n' \| sh		echo -n "LongString" \| cksum \| cut -d " " -f1 \| xargs echo printf '%0X\\n' \| sh
	5751BDB2		5751BDB2

	</pre>		</pre>
	[[Category: Bash]]		[[Category: Bash]]

2021-10-20T18:47:08Z

Create CRC32 from string

← Older revision		Revision as of 11:47, 20 October 2021
Line 98:		Line 98:
	crc32 <(echo "LongString")		crc32 <(echo "LongString")
	1624d322		1624d322

			Or:
			echo -n "LongString" \| cksum \| cut -d " " -f1 \| xargs echo printf '%0X\\n' \| sh
			5751BDB2

	</pre>		</pre>
	[[Category: Bash]]		[[Category: Bash]]