1.pszmelczynski@linux-p39-2:~$ cd ../../etc
pszmelczynski@linux-p39-2:/etc$ cat passwd
pszmelczynski@linux-p39-2:/$ cd ../../etc
pszmelczynski@linux-p39-2:/etc$ pg -5 /etc/passwd

pszmelczynski@linux-p39-2:/etc$ pg -5 /etc/passwd
systemd-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/bin/false
pszmelczynski@linux-p39-2:/etc$ pg -5 /etc/passwd



2.pszmelczynski@linux-p39-2:~$ cat > plik1.txt
QWERTY

pszmelczynski@linux-p39-2:~$ cat > plik2.txt
Qwertyy

pszmelczynski@linux-p39-2:~$ cat plik1.txt plik2.txt> plik3.txt
pszmelczynski@linux-p39-2:~$ cat plik1.txt plik2.txt> plik3.txt
pszmelczynski@linux-p39-2:~$ cat >> plik3.txt
plik3

3.pszmelczynski@linux-p39-2:~$ head -q -n5 plik*
QWERTY
Qwertyy
QWERTY
Qwertyy
plik3



4.pszmelczynski@linux-p39-2:~$ cd ../../etc
pszmelczynski@linux-p39-2:/etc$ head -n 5 /etc/passwd | tail -n 3
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

5.pszmelczynski@linux-p39-2:/etc$ tac  /etc/passwd |  tail -n 7 | head -n 3
man:x:6:12:man:/var/cache/man:/usr/sbin/nologin
games:x:5:60:games:/usr/games:/usr/sbin/nologin
sync:x:4:65534:sync:/bin:/bin/sync


6.pszmelczynski@linux-p39-2:/etc$ cat /etc/passwd tr -n
pszmelczynski@linux-p39-2:/etc$ cat /etc/passwd | tr '\n' ' '
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 games:x:5:60: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 irc:x:39:39:ircd:/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-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/bin/false systemd-network:x:101:103:systemd Network Management,,,:/run/systemd/netif:/bin/false systemd-resolve:x:102:104:systemd Resolver,,,:/run/systemd/resolve:/bin/false systemd-bus-proxy:x:103:105:systemd Bus Proxy,,,:/run/systemd:/bin/false syslog:x:104:108::/home/syslog:/bin/false _apt:x:105:65534::/nonexistent:/bin/false messagebus:x:106:110::/var/run/dbus:/bin/false uuidd:x:107:111::/run/uuidd:/bin/false lightdm:x:108:114:Light Display Manager:/var/lib/lightdm:/bin/false whoopsie:x:109:117::/nonexistent:/bin/false avahi-autoipd:x:110:119:Avahi autoip daemon,,,:/var/lib/avahi-autoipd:/bin/false avahi:x:111:120:Avahi mDNS daemon,,,:/var/run/avahi-daemon:/bin/false colord:x:112:123:colord colour management daemon,,,:/var/lib/colord:/bin/false dnsmasq:x:113:65534:dnsmasq,,,:/var/lib/misc:/bin/false hplip:x:114:7:HPLIP system user,,,:/var/run/hplip:/bin/false kernoops:x:115:65534:Kernel Oops Tracking Daemon,,,:/:/bin/false pulse:x:116:124:PulseAudio daemon,,,:/var/run/pulse:/bin/false rtkit:x:117:126:RealtimeKit,,,:/proc:/bin/false saned:x:118:127::/var/lib/saned:/bin/false usbmux:x:119:46:usbmux daemon,,,:/var/lib/usbmux:/bin/false speech-dispatcher:x:120:29:Speech Dispatcher,,,:/var/run/speech-dispatcher:/bin/false pk:x:1000:1000:Pracownia Komputerowa,,,:/home/pk:/bin/bash sshd:x:121:65534::/var/run/sshd:/usr/sbin/nologin postfix:x:122:129::/var/spool/postfix:/bin/false sbt:x:999:999:sbt daemon-user:/home/sbt:/bin/false epmd:x:123:132::/var/run/epmd:/bin/false nvidia-persistenced:x:124:134:NVIDIA Persistence Daemon,,,:/:/sbin/nologin statd:x:125:65534::/var/lib/nfs:/bin/false ppszmelczynski@linux-p39-2:/etc$ cd `

7.pszmelczynski@linux-p39-2:/etc$ cd ~
pszmelczynski@linux-p39-2:~$  cat > plik.txt
dowolny tekst
pszmelczynski@linux-p39-2:~$ cat >> plik.txt
dowolny tekst
pszmelczynski@linux-p39-2:~$ cat plik.txt | tr ' ' '\n'
dowolny
tekst
dowolny
tekst

8.pszmelczynski@linux-p39-2:~$ cd ../../etc
pszmelczynski@linux-p39-2:/etc$
pszmelczynski@linux-p39-2:/etc$ find /etc/ -type f 2>/def/null| wc -l
1999

pszmelczynski@linux-p39-2:~$ find /etc/passwd | head -n3 | wc -m
12
9.pszmelczynski@linux-p39-2:~$ cat  /etc/passwd | head -n3 | wc -m
117