Aggiunti esercizi

101/012_elaborare_flussi_di_testo.md

@@ -180,4 +180,152 @@ echo "new line" >> ftu.txt
 sha256sum -c sha256sum.txt
 ftu.txt: NON RIUSCITO
 sha256sum: WARNING: 1 computed checksum did NOT match
+```
+
+### Esercizi
+
+```bash
+root:x:0:0:root:/root:/bin/bash
+daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin
+bin:x:2:2:bin:/bin:/usr/sbin/nologin
+sys:x:3:3:sys:/dev:/usr/sbin/nologin
+sync:x:4:65534:sync:/bin:/bin/sync
+nvidia-persistenced:x:121:128:NVIDIA Persistence Daemon,,,:/nonexistent:/sbin/nologin
+libvirt-qemu:x:64055:130:Libvirt Qemu,,,:/var/lib/libvirt:/usr/sbin/nologin
+libvirt-dnsmasq:x:122:133:Libvirt Dnsmasq,,,:/var/lib/libvirt/dnsmasq:/usr/sbin/nologin
+carol:x:1000:2000:Carol Smith,Finance,,,Main Office:/home/carol:/bin/bash
+dave:x:1001:1000:Dave Edwards,Finance,,,Main Office:/home/dave:/bin/ksh
+emma:x:1002:1000:Emma Jones,Finance,,,Main Office:/home/emma:/bin/bash
+frank:x:1003:1000:Frank Cassidy,Finance,,,Main Office:/home/frank:/bin/bash
+grace:x:1004:1000:Grace Kearns,Engineering,,,Main Office:/home/grace:/bin/ksh
+henry:x:1005:1000:Henry Adams,Sales,,,Main Office:/home/henry:/bin/bash
+john:x:1006:1000:John Chapel,Sales,,,Main Office:/home/john:/bin/bash
+```
+
+- Elenca solo gli utenti del gruppo 1000
+
+```bash
+[20:21 sab nov 02]dado@pc (957):~
+ > grep 1000 passwd
+carol:x:1000:2000:Carol Smith,Finance,,,Main Office:/home/carol:/bin/bash
+dave:x:1001:1000:Dave Edwards,Finance,,,Main Office:/home/dave:/bin/ksh
+emma:x:1002:1000:Emma Jones,Finance,,,Main Office:/home/emma:/bin/bash
+frank:x:1003:1000:Frank Cassidy,Finance,,,Main Office:/home/frank:/bin/bash
+grace:x:1004:1000:Grace Kearns,Engineering,,,Main Office:/home/grace:/bin/ksh
+henry:x:1005:1000:Henry Adams,Sales,,,Main Office:/home/henry:/bin/bash
+john:x:1006:1000:John Chapel,Sales,,,Main Office:/home/john:/bin/bash
+
+[20:21 sab nov 02]dado@pc (958):~
+ > sed -n /1000/p < passwd
+carol:x:1000:2000:Carol Smith,Finance,,,Main Office:/home/carol:/bin/bash
+dave:x:1001:1000:Dave Edwards,Finance,,,Main Office:/home/dave:/bin/ksh
+emma:x:1002:1000:Emma Jones,Finance,,,Main Office:/home/emma:/bin/bash
+frank:x:1003:1000:Frank Cassidy,Finance,,,Main Office:/home/frank:/bin/bash
+grace:x:1004:1000:Grace Kearns,Engineering,,,Main Office:/home/grace:/bin/ksh
+henry:x:1005:1000:Henry Adams,Sales,,,Main Office:/home/henry:/bin/bash
+john:x:1006:1000:John Chapel,Sales,,,Main Office:/home/john:/bin/bash
+```
+
+- Elenca solo i nomi completi di questi utenti
+
+```bash
+[20:23 sab nov 02]dado@pc (962):~
+ > sed -n /1000/p < passwd | cut -d : -f 5 | cut -d , -f 1
+Carol Smith
+Dave Edwards
+Emma Jones
+Frank Cassidy
+Grace Kearns
+Henry Adams
+John Chapel
+```
+
+- Un comando che seleziona un utente a caso del Main Office
+
+```bash
+[20:26 sab nov 02]dado@pc (971):~
+ > sed -n /Main\ Office/p < passwd | cut -d : -f 5 | cut -d , -f 1 | sort -R | head -n 1
+ ```
+
+- Quante persone lavorano in Finance, Engineering e Sales? 
+
+```bash
+[20:28 sab nov 02]dado@pc (978):~
+ > grep -iE "finance|engineering|sales" passwd | wc -l
+7
+
+[20:28 sab nov 02]dado@pc (979):~
+ > grep -iE "finance" passwd | wc -l
+4
+
+[20:30 sab nov 02]dado@pc (981):~
+ > grep -iE "engineering" passwd | wc -l
+1
+
+[20:30 sab nov 02]dado@pc (982):~
+ > grep -iE "sales" passwd | wc -l
+2
+
+[21:09 sab nov 02]dado@pc (1108):~
+ > sed -n /Main\ Office/p < passwd | cut -d , -f 2 | sort | uniq -c
+      1 Engineering
+      4 Finance
+      2 Sales
+```
+
+- Creare un file .csv col formato seguente
+
+```bash
+First Name, Last Name, Position
+
+
+[20:40 sab nov 02]dado@pc (1016):~
+ > sed -n /Main\ Office/p < passwd | cut -d : -f 5 | cut -d , -f 1,2 | cut -d " " -f 1,2 --output-delimiter=, > names.csv
+Carol,Smith,Finance
+Dave,Edwards,Finance
+Emma,Jones,Finance
+Frank,Cassidy,Finance
+Grace,Kearns,Engineering
+Henry,Adams,Sales
+John,Chapel,Sales
+```
+
+- Assicurasi l'integrita' del file precedente tramite `md5sum`:
+
+```bash
+[20:44 sab nov 02]dado@pc (1024):~
+ > md5sum names.csv > md5sum_names.txt
+
+[20:45 sab nov 02]dado@pc (1026):~
+ > md5sum -c md5sum_names.txt
+names.csv: OK
+
+[20:45 sab nov 02]dado@pc (1027):~
+ > echo "new line" >> md5sum_names.txt
+
+[20:46 sab nov 02]dado@pc (1028):~
+ > md5sum -c md5sum_names.txt
+names.csv: OK
+md5sum: WARNING: 1 line is improperly formatted
+```
+
+- Dall'output di `ls -l /etc`, ottenere solo i nomi dei file
+
+```bash
+[21:13 sab nov 02]dado@pc (1114):~
+ > ls -l /etc/ | tr -s " " | cut -d " " -f 9
+```
+
+- Nome e proprietario
+
+```bash
+[21:13 sab nov 02]dado@pc (1114):~
+ > ls -l /etc/ | tr -s " " | cut -d " " -f 9,3
+```
+
+- SOLO i nomi delle cartelle e del proprietario
+
+```bash
+[21:16 sab nov 02]dado@pc (1120):~
+ > ls -l /etc/ | tr -s " " | grep ^d | cut -d " " -f 9,3
 ```