#ls /etc a

ls: невозможно получить доступ к a: Нет такого файла или каталога
/etc:
acpi                    group             magic           rc5.d
adduser.conf            group-            magic.mime      rc6.d
adjtime                 grub.d            mailcap         rc.local
aliases                 gshadow           mailcap.order   rcS.d
alternatives            gshadow-          mailname        reportbug.conf
apt                     gssapi_mech.conf  mail.rc         resolv.conf
at.deny                 host.conf         manpath.config  rmt
bash.bashrc             hostname          mime.types      rpc
bash_completion         hosts             mke2fs.conf     rsyslog.conf
bash_completion.d       hosts.allow       modprobe.d      rsyslog.d
bindresvport.blacklist  hosts.deny        modules         screenrc
ca-certificates         idmapd.conf       motd            securetty
ca-certificates.conf    init.d            motd.tail       security
calendar                initramfs-tools   mtab            services
chatscripts             inittab           Muttrc          sgml
console-setup           inputrc           Muttrc.d        shadow
cron.d                  insserv           nanorc          shadow-
cron.daily              insserv.conf      network         shells
cron.hourly             insserv.conf.d    networks        skel
cron.monthly            iproute2          nsswitch.conf   ssh
crontab                 issue             openoffice      ssl
cron.weekly             issue.net         opt             sysctl.conf
debconf.conf            kbd               pam.conf        sysctl.d
debian_version          kernel            pam.d           terminfo
default                 kernel-img.conf   passwd          texmf
deluser.conf            ldap              passwd-         timezone
dhcp                    ld.so.cache       perl            ucf.conf
dictionaries-common     ld.so.conf        ppp             udev
discover.conf.d         ld.so.conf.d      profile         ufw
discover-modprobe.conf  lilalo            profile.d       updatedb.conf
dpkg                    locale.alias      protocols       vim
emacs                   locale.gen        python          w3m
email-addresses         localtime         python2.6       wgetrc
environment             logcheck          rc0.d           X11
exim4                   login.defs        rc1.d           xml
fstab                   logrotate.conf    rc2.d
gai.conf                logrotate.d       rc3.d
groff                   lsb-base          rc4.d