To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.

wilder@wilder-ThinkPad-T440p:~/Pictures$ cd ..
wilder@wilder-ThinkPad-T440p:~$ pwd
/home/wilder
wilder@wilder-ThinkPad-T440p:~$ ls
Desktop    Downloads         files  Pictures  Templates
Documents  examples.desktop  Music  Public    Videos
wilder@wilder-ThinkPad-T440p:~$ ls .
Desktop    Downloads         files  Pictures  Templates
Documents  examples.desktop  Music  Public    Videos
wilder@wilder-ThinkPad-T440p:~$ ls -a
.              .bashrc  Documents         .gnupg         Music     .ssh
..             .cache   Downloads         .ICEauthority  Pictures  Templates
.bash_history  .config  examples.desktop  .local         .profile  .thunderbird
.bash_logout   Desktop  files             .mozilla       Public    Videos
wilder@wilder-ThinkPad-T440p:~$ ls Pictures
WildCodeSchool_logo_pink_background_400x220.png
wilder@wilder-ThinkPad-T440p:~$ ls /home/wilder
Desktop    Downloads         files  Pictures  Templates
Documents  examples.desktop  Music  Public    Videos
wilder@wilder-ThinkPad-T440p:~$ ls /home
wilder
wilder@wilder-ThinkPad-T440p:~$ ls /bin
bash           fuser       nisdomainname  stty
brltty         fusermount  ntfs-3g        su
bunzip2        getfacl     ntfs-3g.probe  sync
busybox        grep        ntfscat        systemctl
bzcat          gunzip      ntfscluster    systemd
bzcmp          gzexe       ntfscmp        systemd-ask-password
bzdiff         gzip        ntfsfallocate  systemd-escape
bzegrep        hciconfig   ntfsfix        systemd-hwdb
bzexe          hostname    ntfsinfo       systemd-inhibit
bzfgrep        ip          ntfsls         systemd-machine-id-setup
bzgrep         journalctl  ntfsmove       systemd-notify
bzip2          kbd_mode    ntfsrecover    systemd-sysusers
bzip2recover   kill        ntfssecaudit   systemd-tmpfiles
bzless         kmod        ntfstruncate   systemd-tty-ask-password-agent
bzmore         less        ntfsusermap    tar
cat            lessecho    ntfswipe       tempfile
chacl          lessfile    open           touch
chgrp          lesskey     openvt         true
chmod          lesspipe    pidof          udevadm
chown          ln          ping           ulockmgr_server
chvt           loadkeys    ping4          umount
cp             login       ping6          uname
cpio           loginctl    plymouth       uncompress
dash           lowntfs-3g  ps             unicode_start
date           ls          pwd            vdir
dd             lsblk       rbash          wdctl
df             lsmod       readlink       which
dir            mkdir       red            whiptail
dmesg          mknod       rm             ypdomainname
dnsdomainname  mktemp      rmdir          zcat
domainname     more        rnano          zcmp
dumpkeys       mount       run-parts      zdiff
echo           mountpoint  sed            zegrep
ed             mt          setfacl        zfgrep
efibootdump    mt-gnu      setfont        zforce
efibootmgr     mv          setupcon       zgrep
egrep          nano        sh             zless
false          nc          sh.distrib     zmore
fgconsole      nc.openbsd  sleep          znew
fgrep          netcat      ss
findmnt        networkctl  static-sh
wilder@wilder-ThinkPad-T440p:~$ ls -l
total 48
drwxr-xr-x 2 wilder wilder 4096 févr.  1  2019 Desktop
drwxr-xr-x 2 wilder wilder 4096 févr.  1  2019 Documents
drwxr-xr-x 2 wilder wilder 4096 févr.  1  2019 Downloads
-rw-r--r-- 1 wilder wilder 8980 févr.  1  2019 examples.desktop
drwxr-xr-x 2 wilder wilder 4096 sept.  9 16:46 files
drwxr-xr-x 2 wilder wilder 4096 févr.  1  2019 Music
drwxr-xr-x 2 wilder wilder 4096 sept.  9 17:33 Pictures
drwxr-xr-x 2 wilder wilder 4096 févr.  1  2019 Public
drwxr-xr-x 2 wilder wilder 4096 févr.  1  2019 Templates
drwxr-xr-x 2 wilder wilder 4096 févr.  1  2019 Videos
wilder@wilder-ThinkPad-T440p:~$ pwd
/home/wilder
wilder@wilder-ThinkPad-T440p:~$ cd Pictures
wilder@wilder-ThinkPad-T440p:~/Pictures$ cd ..
wilder@wilder-ThinkPad-T440p:~$ pwd
/home/wilder
wilder@wilder-ThinkPad-T440p:~$ cd /opt
wilder@wilder-ThinkPad-T440p:/opt$ pwd
/opt
wilder@wilder-ThinkPad-T440p:/opt$ cd ../home/wilder
wilder@wilder-ThinkPad-T440p:~$ pwd
/home/wilder
wilder@wilder-ThinkPad-T440p:~$ cd /usr/bin
wilder@wilder-ThinkPad-T440p:/usr/bin$ cd
wilder@wilder-ThinkPad-T440p:~$ pwd
/home/wilder
wilder@wilder-ThinkPad-T440p:~$ cd ~
wilder@wilder-ThinkPad-T440p:~$ pwd
/home/wilder
wilder@wilder-ThinkPad-T440p:~$ cd ~/Pictures
wilder@wilder-ThinkPad-T440p:~/Pictures$ pwd
/home/wilder/Pictures
wilder@wilder-ThinkPad-T440p:~/Pictures$