Question

Operating System Lab (CE 351) Lab 6: Users and groups Help: study the file /etc/passwd (page 19 from the notes) Helping commands: useradd passwd userdel groupadd cut grep su Lab exercises: 1. Implement the following tasks: a. Copy the contents of /etc/passwd file separated by space into new.txt file b.Delete a user whose ID is > 1000 ( hint: use shell scripting and the file /etc/passwd)

Answer 1

Answer A
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- 0 X ubuntu 18 [Running] - Oracle VM VirtualBox File Machine View Input Devices Help Activities Terminal Mon 09:54 madhav@sift workstation: - File Edit View Search Terminal Help madhav@siftworkstation:-$ cat /etc/passwd | sed "S/://g" > new.txt madhav@siftworkstation: O = DPWRight Ctrl 3:24 PM ? 4) ENG 05/08/2019 55 U: 16

- 0 X ubuntu 18 [Running] - Oracle VM VirtualBox File Machine View Input Devices Help Activities Terminal Mon 09:54 madhav@sift workstation: - File Edit View Search Terminal Help madhav@siftworkstation :-$ cat new.txt root x o 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 games x 560 games /usr/games /usr/sbin/nologin man x 6 12 man /var/cache/man /usr/sbin/nologin Lp x 7 7 lp /var/spool/lpd /usr/sbin/nologin mail x 8 8 mail /var/mail /usr/sbin/nologin news x 9 9 news /var/spool/news/usr/sbin/nologin UUCP x 10 10 uucp /var/spool/uUcp /usr/sbin/nologin proxy x 13 13 proxy /bin /usr/sbin/nologin www-data x 33 33 www-data /var/www/usr/sbin/nologin backup x 34 34 backup /var/backups /usr/sbin/nologin list x 38 38 Mailing List Manager /var/list /usr/sbin/nologin tre x 39 39 trcd /var/run/ircd /usr/sbin/nologin gnats x 41 41 Gnats Bug-Reporting System (admin) /var/lib/gnats /usr/sbin/nologin nobody x 65534 65534 nobody / nonexistent /usr/sbin/nologin systemd-network x 100 102 systemd Network Management, ,, /run/systemd/netif /usr/sbin/nologin systemd-resolve x 101 103 systemd Resolver,,, /run/systemd/resolve /usr/sbin/nologin syslog x 102 106 /home/syslog /usr/sbin/nologin messagebus x 103 107 /nonexistent /usr/sbin/nologin _apt x 104 65534 /nonexistent /usr/sbin/nologin uuidd x 105 111 /run/uuidd /usr/sbin/nologin avahi-autoipd x 106 112 Avahi autoip daemon,,, /var/lib/avahi-autoipd /usr/sbin/nologin usbrux x 107 46 usbrux daemon... /var/lib/usbaux /usr/sbin/nologin dnsmasq x 108 65534 dnsmasq.,, /var/lib/misc/usr/sbin/nologin rtkit x 109 114 Realtimekit,,, /proc /usr/sbin/nologin Speech-dispatcher x 110 29 Speech Dispatcher,,, /var/run/speech-dispatcher /bin/false, whoopste x 111 117 /nonexistent /bin/false kernoops x 112 65534 Kernel Oops Tracking Daemon,.. / /usr/sbin/nologin 2 J O9 Right Ctrl 3:24 PM E = 24) ENG 05/08/2019 0.916

Answer B
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while IFS=":" read -r user x uid x; do [[ $uid -gt 1000 ]] && echo userdel -r "$user"; done </etc/passwd

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