os week 3 klaar

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+# os week 3 practicum
+
+## 1
+
+```bash
+# print df met "human" sizes -> sorteer "human" op kolom 4 (delimiter automatisch)
+$ df -h | sort -hk4 
+Filesystem      Size  Used Avail Use% Mounted on
+tmpfs           785M   64K  785M   1% /run/user/1000
+dev             3.9G     0  3.9G   0% /dev
+run             3.9G  1.2M  3.9G   1% /run
+tmpfs           3.9G     0  3.9G   0% /dev/shm
+tmpfs           3.9G  4.0K  3.9G   1% /tmp
+/dev/sda2       439G  228G  189G  55% /
+$ 
+```
+
+## 2
+
+```bash
+$ sort -u < opgave2.txt
+een
+en
+nog
+woord
+$ sort < opgave2.txt | uniq
+een
+en
+nog
+woord
+$ 
+```
+
+## 3
+
+Ik denk dat het commando `tee` zo heet omdat het een soort t-splitsing is maar
+dan voor i/o streams.
+
+```bash
+$ ls | tee listing.txt | wc -l
+6
+$ cat listing.txt 
+huiswerk.md
+opgave2.txt
+os-hw.pdf
+os-p.pdf
+practicum.md
+windows.txt
+$ 
+```
+
+## 4
+
+```bash
+$ file windows.txt 
+windows.txt: ASCII text, with CRLF line terminators
+$ xxd windows.txt 
+00000000: 6861 6c6c 6f0d 0a68 616c 6c6f 0d0a 7769  hallo..hallo..wi
+00000010: 6e64 6f77 730d 0a                        ndows..
+$ tr -d '\r' < windows.txt > windows-utf8.txt
+$ file windows-utf8.txt 
+windows-utf8.txt: ASCII text
+$ xxd windows-utf8.txt 
+00000000: 6861 6c6c 6f0a 6861 6c6c 6f0a 7769 6e64  hallo.hallo.wind
+00000010: 6f77 730a                                ows.
+$ 
+```
+
+## 5
+
+```bash
+# a (zie dat 0x0d 0x0a verandert naar 0x0a)
+$ hexdump -C < windows.txt | head -n2
+00000000  68 61 6c 6c 6f 0d 0a 68  61 6c 6c 6f 0d 0a 77 69  |hallo..hallo..wi|
+00000010  6e 64 6f 77 73 0d 0a                              |ndows..|
+$ hexdump -C < windows-utf8.txt | head -n2 
+00000000  68 61 6c 6c 6f 0a 68 61  6c 6c 6f 0a 77 69 6e 64  |hallo.hallo.wind|
+00000010  6f 77 73 0a                                       |ows.|
+$ 
+# b
+$ wc -c < windows.txt   
+23
+# 23 bytes in windows.txt
+$ wc -c < windows-utf8.txt 
+20
+# 20 - 3 bytes in windows-utf8.txt
+$ wc -l < windows.txt 
+3
+# 3 regels in windows.txt (per regel een \r\n)
+$ 
+```