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diff --git a/os1w4/.gitignore b/os1w4/.gitignore
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+index.html
+data.csv
+lines.txt
diff --git a/os1w4/lotto b/os1w4/lotto
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+#!/bin/sh
+seq 42 | shuf | head -n 7 | sort -n | sed -z -e 's/\n/ /g' | awk '1{ print "de lottogetallen zijn: "$1" "$2" "$3" "$5" "$6" "$7", en het reservergetal is: "$4 }'
diff --git a/os1w4/practicum.md b/os1w4/practicum.md
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+# practicum week 4
+
+## 1
+
+```bash
+$ seq 42 | shuf | head -n 6 | sort -n | sed -z -e 's/\n/, /g' -e 's/..$/\n/'
+17, 21, 30, 31, 34, 38
+$ 
+```
+
+## 2
+
+```bash
+$ ./lotto
+de lottogetallen zijn: 1 22 25 30 38 40, en het reservergetal is: 29
+$ ./lotto
+de lottogetallen zijn: 2 12 13 18 27 37, en het reservergetal is: 17
+$ ./lotto
+de lottogetallen zijn: 19 28 33 38 40 41, en het reservergetal is: 34
+$ 
+```
+
+## 3
+
+```bash
+$ grep -zoE '<!--\[if.+?\]>.+?<!\[endif\]-->' index.html
+<!--[if gte IE 6 ]>
+ <p>Only  IE 6 and greater will see this</p>
+<![endif]-->
+$ 
+```
+
+## 4
+
+```bash
+$ grep -zoE '<h2>.+?</h2>' index.html
+<h2>Anchor example</h2>
+$ 
+```
+
+## 5
+
+```bash
+$ sed -zE 's#<h2>(.+?)</h2>#<h3>\1</h3>#g' index.html
+# de output kan je je wel voorstellen denk ik
+```
+
+## 6
+
+```bash
+$ echo "deze zin wordt rot-13 gecodeerd" | tr 'A-Za-z' 'N-ZA-Mn-za-m'
+qrmr mva jbeqg ebg-13 trpbqrreq
+$ 
+```
+
+## 7
+
+```bash
+$ awk 'NR % 2 == 0 { print $0 }' lines.txt
+tweede regel
+vierde regel
+zesde regel
+achtste regel
+tiende regel
+$ 
+```
+
+## 8
+
+```bash
+$ awk -F: '$1 { printf $1 } $5 { printf " ("$5")" } 1 { print "" }' /etc/passwd
+root
+bin
+daemon
+mail
+ftp
+http
+nobody (Nobody)
+dbus (System Message Bus)
+systemd-journal-remote (systemd Journal Remote)
+systemd-network (systemd Network Management)
+systemd-resolve (systemd Resolver)
+systemd-timesync (systemd Time Synchronization)
+systemd-coredump (systemd Core Dumper)
+uuidd
+loek
+git (git daemon user)
+# dit gaat zo nog even door
+```
+
+## 9
+
+```bash
+$ awk '1 { print $4"\t"$1"\t"$3"\t"$2 }' data.csv
+```