diff --git a/20231019/dbs-20231019.pdf b/20231019/dbs-20231019.pdf
index 4dee923564d07c5a98b414fa6c6f20141d117feb..f84bbd5c27d8ea2809154dd09af93c8448684426 100644
Binary files a/20231019/dbs-20231019.pdf and b/20231019/dbs-20231019.pdf differ
diff --git a/20231019/dbs-20231019.tex b/20231019/dbs-20231019.tex
index 6f07ffc38e3838e2b1580438a6973fc8f8423159..e046e63c7f3719e64cf3f303acc1575f14244993 100644
--- a/20231019/dbs-20231019.tex
+++ b/20231019/dbs-20231019.tex
@@ -918,7 +918,7 @@
Hinweise:
\begin{itemize}
\item
- Parameter in Shell-SKripten:
+ Parameter in Shell-Skripten:
\lstinline[style=cmd]{$1}, \lstinline[style=cmd]{$2}, \dots
\item
\lstinline[style=cmd]{man cut}
diff --git a/20231026/dbs-20231026.pdf b/20231026/dbs-20231026.pdf
index edd4b63344f57b26d81b05b362b0d13fae1ec556..155d678a6499a926ac1fd386bcc3378305c6ba5c 100644
Binary files a/20231026/dbs-20231026.pdf and b/20231026/dbs-20231026.pdf differ
diff --git a/20231026/dbs-20231026.tex b/20231026/dbs-20231026.tex
index 4f97fd4c20bfd3faa3aa5185557013163411f4af..8f32b157297165f9708965f95172caa0ccd30833 100644
--- a/20231026/dbs-20231026.tex
+++ b/20231026/dbs-20231026.tex
@@ -594,7 +594,7 @@
Hinweise:
\begin{itemize}
\item
- Parameter in Shell-SKripten:
+ Parameter in Shell-Skripten:
\lstinline[style=cmd]{$1}, \lstinline[style=cmd]{$2}, \dots
\item
\lstinline[style=cmd]{man cut}
@@ -785,6 +785,8 @@
\end{frame}
+\iffalse
+
\subsection{TCP-Protokolle}
\begin{frame}
@@ -954,6 +956,7 @@
\end{frame}
+\fi
\fi
\end{document}
diff --git a/20231026/hello-01 b/20231026/hello-01
new file mode 100755
index 0000000000000000000000000000000000000000..496af8dffb429e184f3bb536ad37c3eab61cd4b6
--- /dev/null
+++ b/20231026/hello-01
@@ -0,0 +1 @@
+echo "Hello, world!"
diff --git a/20231026/hello-02 b/20231026/hello-02
new file mode 100755
index 0000000000000000000000000000000000000000..0d0507294e178eb79204957c309bde3f7b4ee816
--- /dev/null
+++ b/20231026/hello-02
@@ -0,0 +1,5 @@
+#!/bin/bash
+
+echo -n "Wie heißen Sie? "
+read name
+echo "Hallo, $name!"
diff --git a/20231026/http-01.txt b/20231026/http-01.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2671d619877bf99149f7d8271e536ccd8a1b5c93
--- /dev/null
+++ b/20231026/http-01.txt
@@ -0,0 +1,18 @@
+cassini/home/peter/bo/2023ws/dbs/20231026> nc -C 88.198.170.60 80
+GET /
+<!doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN">
+<html>
+ <head>
+ <title>ngc224.gerwinski.de</title>
+ </head>
+ <body background="ngc224.jpg" bgcolor="#000000" text="#CFCFCF"
+ link="#7F7FFF" alink="#CFCFFF" vlink="#FF5FFF">
+ <h1>ngc224.gerwinski.de - der Server</h1>
+ <p>Benannt nach der Andromeda-Galaxie - M31 - NGC224
+ <p align="center"><img src="null.png" alt="" width="1" height="1" vspace="360">
+ <p><font size="-2"><a href="http://www.peter.gerwinski.de">Peter Gerwinski</a><br>
+ <a href="http://www.noao.edu/image_gallery/html/im0424.html">Bild:
+ Bill Schoening, Vanessa Harvey/REU program/NOAO/AURA/NSF</a></font>
+ </body>
+</html>
+cassini/home/peter/bo/2023ws/dbs/20231026>
diff --git a/20231026/loops-02.txt b/20231026/loops-02.txt
new file mode 100644
index 0000000000000000000000000000000000000000..2014aa3329a867e121f9279d7b639f883b0810bd
--- /dev/null
+++ b/20231026/loops-02.txt
@@ -0,0 +1 @@
+cassini/home/peter/bo/2023ws/dbs> for x in 20231019 20231026; do ( cd $x; pdflatex dbs-$x.tex ); done
diff --git a/20231026/mailbox.txt b/20231026/mailbox.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d9bd8aadf88330dd89417b15fd5b559139983f53
--- /dev/null
+++ b/20231026/mailbox.txt
@@ -0,0 +1,53 @@
+From elon.musk@hs-bochum.de Thu Oct 26 12:32:51 2023
+Return-path: <elon.musk@hs-bochum.de>
+Envelope-to: peter@phoenix.intern
+Delivery-date: Thu, 26 Oct 2023 12:32:51 +0200
+Received: from [127.0.0.1] (helo=m31.gerwinski.de)
+ by cassini with esmtp (Exim 4.96)
+ (envelope-from <elon.musk@hs-bochum.de>)
+ id 1qvxfW-000Yl7-1s
+ for peter@phoenix.intern;
+ Thu, 26 Oct 2023 12:32:51 +0200
+Received: from [195.37.15.82] (helo=cassini)
+ by m31.gerwinski.de with smtp (Exim 4.94.2)
+ (envelope-from <elon.musk@hs-bochum.de>)
+ id 1qvxeT-006C4R-Pr
+ for peter@gerwinski.de; Thu, 26 Oct 2023 12:32:51 +0200
+From: Elon Musk <elon@musk.com>
+To: Bill Gates <gates@microsoft.com>
+Subject: New Job
+Message-Id: <E1qvxfW-000Yl7-1s@cassini>
+Date: Thu, 26 Oct 2023 12:32:51 +0200
+Content-Length: 43
+Lines: 1
+
+Hi, Bill! I'm now at hs-bochum.de! B-) CU!
+
+From peter.gerwinski@hs-bochum.de Thu Oct 26 12:27:58 2023
+Return-path: <peter.gerwinski@hs-bochum.de>
+Envelope-to: peter@phoenix.intern
+Delivery-date: Thu, 26 Oct 2023 12:27:58 +0200
+Received: from [127.0.0.1] (helo=m31.gerwinski.de)
+ by cassini with esmtp (Exim 4.96)
+ (envelope-from <peter.gerwinski@hs-bochum.de>)
+ id 1qvxam-000YXM-3D
+ for peter@phoenix.intern;
+ Thu, 26 Oct 2023 12:27:58 +0200
+Received: from [195.37.15.82] (helo=cassini)
+ by m31.gerwinski.de with smtp (Exim 4.94.2)
+ (envelope-from <peter.gerwinski@hs-bochum.de>)
+ id 1qvxaO-006BmH-FT
+ for peter@gerwinski.de; Thu, 26 Oct 2023 12:27:57 +0200
+Subject: Test
+Message-Id: <E1qvxam-000YXM-3D@cassini>
+From: peter.gerwinski@hs-bochum.de
+Date: Thu, 26 Oct 2023 12:27:58 +0200
+Content-Length: 45
+Lines: 5
+
+Hallo,
+
+dies ist ein Test.
+
+Schöne Grüße!
+
diff --git a/20231026/nc-01.txt b/20231026/nc-01.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d8c63d1ead421ad55537843c0da40e46192d71a7
--- /dev/null
+++ b/20231026/nc-01.txt
@@ -0,0 +1,20 @@
+cassini/home/peter> nc -p 1234 -l
+Hallo?
+Hier auch hallo! :-)
+Ah. Schön, Dich zu treffen.
+Ganz meinerseits.
+Tschüs!
+Tschüs!
+^C
+cassini/home/peter>
+
+8< ---------------------------------------------------------------------
+
+cassini/home/peter/bo/2023ws/dbs/20231026> nc 127.0.0.1 1234
+Hallo?
+Hier auch hallo! :-)
+Ah. Schön, Dich zu treffen.
+Ganz meinerseits.
+Tschüs!
+Tschüs!
+cassini/home/peter/bo/2023ws/dbs/20231026>
diff --git a/20231026/nc-02.txt b/20231026/nc-02.txt
new file mode 100644
index 0000000000000000000000000000000000000000..82de65fd52608b716b9345d3fc705862ded2a220
--- /dev/null
+++ b/20231026/nc-02.txt
@@ -0,0 +1,11 @@
+cassini/home/peter/bo/2023ws/dbs/20231026> cat hello-01
+echo "Hello, world!"
+cassini/home/peter/bo/2023ws/dbs/20231026> chmod +x hello-01
+cassini/home/peter/bo/2023ws/dbs/20231026> nc -p 1234 -l -c ./hello-01
+cassini/home/peter/bo/2023ws/dbs/20231026>
+
+8< ---------------------------------------------------------------------
+
+cassini/home/peter> nc localhost 1234
+Hello, world!
+cassini/home/peter>
diff --git a/20231026/nc-03.txt b/20231026/nc-03.txt
new file mode 100644
index 0000000000000000000000000000000000000000..b1dc470fda9391b21e8016277de71261525ebbd4
--- /dev/null
+++ b/20231026/nc-03.txt
@@ -0,0 +1,16 @@
+cassini/home/peter/bo/2023ws/dbs/20231026> cat hello-02
+#!/bin/bash
+
+echo -n "Wie heißen Sie? "
+read name
+echo "Hallo, $name!"
+cassini/home/peter/bo/2023ws/dbs/20231026> nc -p 1234 -l -c ./hello-02
+cassini/home/peter/bo/2023ws/dbs/20231026>
+
+8< ---------------------------------------------------------------------
+
+cassini/home/peter> nc localhost 1234
+Wie heißen Sie? Peter
+Hallo, Peter!
+Sie haben Post in /var/mail/peter.
+cassini/home/peter>
diff --git a/20231026/pipes-04.txt b/20231026/pipes-04.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3efcc96644d0d792d74548f1a873f6b73a5c6c0c
--- /dev/null
+++ b/20231026/pipes-04.txt
@@ -0,0 +1,547 @@
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^65536" | bc -l
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+cassini/home/peter/bo/2023ws/dbs/20231019>
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | sed -e 's/0/o/g'
+2^4o96
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/o/g'
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+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/x/g'
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+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g'
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+315419.336
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g' | grep 42
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+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g' | grep 42 | wc -l
+6
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g' | grep -o 4242
+42
+42
+42
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+42
+42
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g' | grep -o "[0-9]*"
+1
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+15213796825837188
+9183365675122131849284636812555
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+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g' 1.443888814131525.669175271.716624382579964249.4738378.3842334832839\
+539.797155745684882681193499755834.89.1.6714439262837987573438185793\
+6.7263236.878513652779459569765437.999834.36159.134383718314428.7..1\
+18559462263763188393977127456723346843445866174968.79.87.58.37.4.712\
+84.4874.1186.9114467977783598.29..66869389768817877859469.563.19.26.\
+94.5995794534328234693.3.26696443.59.25.1597239986771421554169383555\
+9885291486318237914434496734.878118726394964751..189.41349..8417.616\
+75.9366833385.551.32972.8826955.769983616369411933.15213796825837188\
+.9183365675122131849284636812555.2259983..41234478486259567449219461\
+7.238.65.591324561.82573183538..876.86221.283427.1976982.2313169.176\
+78..6675195485.7992163641937.285375124784.149.715913545998279.513399\
+6115517942711.6831134.9.584272884279791554849782954323534517.6522326\
+9.613949.5987693..212296339568778287894844.616..7412945674919823.5.5\
+7164237715481632138.631.459.29161369267.834285644.73.4478999719.1781\
+46576347322385.267253.59899795996.9.7994692.177462481771844986745565\
+925.178329.7.47311943316555.8.756822184657174637329688491281952.3174\
+57..244.92661691.874148385.784119298.45229818573389776481.3126.859.3\
+..13.24134671897266732164915111316.292.781738.33436.9.2438.47.834.4.\
+315419.336
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g' | grep pruzzel
+cassini/home/peter/bo/2023ws/dbs/20231019> echo $?
+1
+cassini/home/peter/bo/2023ws/dbs/20231019> echo "2^4096" | bc | sed -e 's/0/./g' | grep 137 75.9366833385.551.32972.8826955.769983616369411933.15213796825837188\
+cassini/home/peter/bo/2023ws/dbs/20231019> echo $?
+0
+cassini/home/peter/bo/2023ws/dbs/20231019> if echo "2^4096" | bc | sed -e 's/0/./g' | grep 137; then echo "gefunden"; else echo "nicht gefunden"; fi
+75.9366833385.551.32972.8826955.769983616369411933.15213796825837188\
+gefunden
+cassini/home/peter/bo/2023ws/dbs/20231019> if echo "2^4096" | bc | sed -e 's/0/./g' | grep 1337; then echo "gefunden"; else echo "nicht gefunden"; fi
+nicht gefunden
+cassini/home/peter/bo/2023ws/dbs/20231019> if echo "2^4096" | bc | sed -e 's/0/./g' | grep 137; then echo "gefunden"; else echo "nicht gefunden"; fi
+75.9366833385.551.32972.8826955.769983616369411933.15213796825837188\
+gefunden
+cassini/home/peter/bo/2023ws/dbs/20231019> if echo "2^4096" | bc | sed -e 's/0/./g' | grep -s 137; then echo "gefunden"; else echo "nicht gefunden"; fi
+75.9366833385.551.32972.8826955.769983616369411933.15213796825837188\
+gefunden
+cassini/home/peter/bo/2023ws/dbs/20231019> if echo "2^4096" | bc | sed -e 's/0/./g' | grep -q 137; then echo "gefunden"; else echo "nicht gefunden"; fi
+gefunden
+cassini/home/peter/bo/2023ws/dbs/20231019> if echo "2^4096" | bc | sed -e 's/0/./g' | grep 137 > /dev/null; then echo "gefunden"; else echo "nicht gefunden"; fi
+gefunden
+cassini/home/peter/bo/2023ws/dbs/20231019>
diff --git a/20231026/sed-01.txt b/20231026/sed-01.txt
new file mode 100644
index 0000000000000000000000000000000000000000..546217e72d047f1081118ee3cfd0abd86073ccf2
--- /dev/null
+++ b/20231026/sed-01.txt
@@ -0,0 +1,6 @@
+cassini/home/peter/bo/2023ws/dbs/20231019> grep SKripten *.tex
+dbs-20231019.tex: Parameter in Shell-SKripten:
+cassini/home/peter/bo/2023ws/dbs/20231019> sed -i 's/SKripten/Skripten/' *.tex
+cassini/home/peter/bo/2023ws/dbs/20231019> cd ../20231026
+cassini/home/peter/bo/2023ws/dbs/20231026> sed -i 's/SKripten/Skripten/' *.tex
+cassini/home/peter/bo/2023ws/dbs/20231026>
diff --git a/20231026/smtp-01.txt b/20231026/smtp-01.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a54f9e860fa552fd3b5413379691444ef79d5b30
--- /dev/null
+++ b/20231026/smtp-01.txt
@@ -0,0 +1,22 @@
+cassini/home/peter/bo/2023ws/dbs/20231026> nc 88.198.170.60 25
+220 mx1.gerwinski.de ESMTP Exim 4.94.2 Thu, 26 Oct 2023 12:26:53 +0200
+HELO cassini
+250 mx1.gerwinski.de Hello cassini [195.37.15.82]
+MAIL FROM: <peter.gerwinski@hs-bochum.de>
+250 OK
+RCPT TO: <peter@gerwinski.de>
+250 Accepted
+DATA
+354 Enter message, ending with "." on a line by itself
+Subject: Test
+
+Hallo,
+
+dies ist ein Test.
+
+Schöne Grüße!
+.
+250 OK id=1qvxaO-006BmH-FT
+QUIT
+221 mx1.gerwinski.de closing connection
+cassini/home/peter/bo/2023ws/dbs/20231026>
diff --git a/20231026/smtp-02.txt b/20231026/smtp-02.txt
new file mode 100644
index 0000000000000000000000000000000000000000..44410fc15c3dd6447fa11066320ec3801ef82a20
--- /dev/null
+++ b/20231026/smtp-02.txt
@@ -0,0 +1,25 @@
+cassini/home/peter/bo/2023ws/dbs/20231026> nc 88.198.170.60 25
+220 mx1.gerwinski.de ESMTP Exim 4.94.2 Thu, 26 Oct 2023 12:30:18 +0200
+HELO cassini
+250 mx1.gerwinski.de Hello cassini [195.37.15.82]
+MAIL FROM: <elon.musk@hs-bochum.de>
+250 OK
+RCPT TO: <peter@gerwinski.de>
+451-195.37.15.82 is not yet authorized to deliver mail from
+451 <elon.musk@hs-bochum.de> to <peter@gerwinski.de>. Please try later.
+MAIL FROM: <elon.musk@hs-bochum.de>
+503 sender already given
+RCPT TO: <peter@gerwinski.de>
+250 Accepted
+DATA
+354 Enter message, ending with "." on a line by itself
+From: Elon Musk <elon@musk.com>
+To: Bill Gates <gates@microsoft.com>
+Subject: New Job
+
+Hi, Bill! I'm now at hs-bochum.de! B-) CU!
+.
+250 OK id=1qvxeT-006C4R-Pr
+QUIT
+221 mx1.gerwinski.de closing connection
+cassini/home/peter/bo/2023ws/dbs/20231026>
diff --git a/20231026/x-01 b/20231026/x-01
new file mode 100755
index 0000000000000000000000000000000000000000..c5899dc5da4d4d22c97dac947b887ef0513e4026
--- /dev/null
+++ b/20231026/x-01
@@ -0,0 +1 @@
+#!/bin/ls -l
diff --git a/20231026/x-02 b/20231026/x-02
new file mode 100755
index 0000000000000000000000000000000000000000..9b3166639af0fcdef40e8e53589fe372e51e10a8
--- /dev/null
+++ b/20231026/x-02
@@ -0,0 +1 @@
+#!/bin/ls -l dbs-20231026.tex