UNIX/Linux Shell Scripting - Revision history

Lsokolowski1: /* Exercises */

2026-04-22T13:29:19Z

Exercises

← Older revision		Revision as of 13:29, 22 April 2026
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	18. Certificates		18. Certificates
	Usefull tool:		Usefull tool:
	apt install mono-~~dev~~ -y # certmgr tool		apt install mono-devel -y # certmgr tool

	1. Prep self signed cert		1. Prep self signed cert

2026-04-22T13:26:11Z

Exercises

← Older revision		Revision as of 13:26, 22 April 2026
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	-- missing function definition		-- missing function definition
	- test some of these http://www.tldp.org/LDP/abs/html/abs-guide.html#GOTCHAS		- test some of these http://www.tldp.org/LDP/abs/html/abs-guide.html#GOTCHAS
	~~</pre>~~


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	Extract Cert:		Extract Cert:
	openssl pkcs12 -in server.pfx -clcerts -nokeys -out server1.crt		openssl pkcs12 -in server.pfx -clcerts -nokeys -out server1.crt
			</pre>
	<!-- some answers to above exercises		<!-- some answers to above exercises
	answ 10a)		answ 10a)

2026-04-22T13:24:32Z

Exercises

@@ Line 2,257: / Line 2,257: @@
 - test some of these http://www.tldp.org/LDP/abs/html/abs-guide.html#GOTCHAS
 </pre>
 <!-- some answers to above exercises

2026-03-27T18:27:47Z

Exercises

← Older revision		Revision as of 18:27, 27 March 2026
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	3. grep -cw offence 2023-05/2023-05-city-of-london-street.csv ; grep -c '\<offence' 2023-05/2023-05-city-of-london-street.csv		3. grep -cw offence 2023-05/2023-05-city-of-london-street.csv ; grep -c '\<offence' 2023-05/2023-05-city-of-london-street.csv
	4. grep -C 1 Inn 2023-05/2023-05-city-of-london-street.csv ; -A 1 ; -B 1		4. grep -C 1 Inn 2023-05/2023-05-city-of-london-street.csv ; -A 1 ; -B 1
	5. LC_ALL=C grep -rc "sexual" /street.csv		5. LC_ALL=C grep -rc "sexual" /street.csv ; find /logs/ -type f \| xargs -P 4 grep "error"
	-->		-->

2026-03-27T18:24:20Z

References

← Older revision		Revision as of 18:24, 27 March 2026
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	[https://tldp.org/LDP/abs/html/abs-guide.html#SAMPLE-BASHRC Sample .bashrc]		[https://tldp.org/LDP/abs/html/abs-guide.html#SAMPLE-BASHRC Sample .bashrc]

			[https://www.gnu.org/software/gawk/manual/gawk.html AWK]

	== Exercises ==		== Exercises ==

2026-03-27T18:22:25Z

Exercise

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 ** Gawk might not reset the splitting with $0, use $1 instead
 ** Add BEGIN and END with some messages
 == References ==

2026-03-27T18:21:00Z

Exercise

← Older revision		Revision as of 18:21, 27 March 2026
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	=== Exercise ===		=== Exercise ===
	* [[UNIX/Linux_Shell_Scripting#Exercises\|Exercise nr 15]]		* [[UNIX/Linux_Shell_Scripting#Exercises\|Exercise nr 15]]
			* Reuse ''Example 4'' and make it better
			** Reset FNR and 'prev' for each file (if more files're provided)
			** Gawk might not reset the splitting with $0, use $1 instead
			** Add BEGIN and END with some messages

	== References ==		== References ==

2026-03-27T18:17:23Z

awk Examples

@@ Line 1,994: / Line 1,994: @@
 ==== awk example 2 ====
-Pointers
+Pointers FS, RS, OFS, ORS
 <pre>
 echo "id=101&name=Jan&status=active" | awk '
@@ Line 2,009: / Line 2,009: @@
 Clearer passing of variables
 <pre>
-LIMIT=10 PREFIX="Log" ls -la | awk -v lim="$LIMIT" -v pre="$PREFIX" '$2 > lim { print pre, $0 }'
+LIMIT=10 ; PREFIX="Log" ; ls -la | awk -v lim="$LIMIT" -v pre="$PREFIX" '$2 > lim { print pre, $0 }'
 </pre>

2026-03-27T11:15:38Z

sed Examples

2026-03-27T11:12:59Z

awk Examples

← Older revision		Revision as of 11:12, 27 March 2026
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	==== awk example 2 ====		==== awk example 2 ====
			Pointers
	<pre>		<pre>
	echo "id=101&name=Jan&status=active" \| awk '		echo "id=101&name=Jan&status=active" \| awk '
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	}		}
	{ print $1, $2 }'		{ print $1, $2 }'
			</pre>

			==== awk example 3 ====
			Clearer passing of variables
			<pre>
			LIMIT=10 PREFIX="Log" ls -la \| awk -v lim="$LIMIT" -v pre="$PREFIX" '$2 > lim { print pre, $0 }'
	</pre>		</pre>