Forward and Reverse DNS Lookups

Hostname to IP:

perl -MSocket -lne 'print "$_: ", eval { inet_ntoa inet_aton $_ }' sites.txt

IP to hostname:

perl -MSocket -lne 'print "$_: ", scalar gethostbyaddr( inet_aton( $_ ), AF_INET )' ips.txt

US International Keyboard

To enable typing of international characters with AltGr key while using US layout:

setxkbmap -rules evdev -model evdev -layout us -variant altgr-intl

To make the changes persistant create /etc/X11/xorg.conf.d/10-keyboard-layout.conf file:

Section "InputClass"
        Identifier "keyboard-layout"
        Driver "evdev"
        MatchIsKeyboard "yes"
        Option "XkbLayout"  "us"
        Option "XkbVariant" "altgr-intl"
EndSection

Some useful key combinations:

• á ← AltGr+a
• ä ← AltGr+q
• č ← Shift+AltGr+.+c
• ď ← Shift+AltGr+.+d
• é ← AltGr+e
• í ← AltGr+i
• ĺ ← AltGr+'+l
• ľ ← Shift+AltGr+.+l
• ň ← Shift+AltGr+.+n
• ó ← AltGr+o
• ô ← AltGr+6+o
• ŕ ← AltGr+'+r
• š ← Shift+AltGr+.+s
• ť ← Shift+AltGr+.+t
• ú ← AltGr+u
• ý ← AltGr+'+y
• ž ← Shift+AltGr+.+z
• £ ← Shift+AltGr+4
• € ← AltGr+5
• ¥ ← AltGr+-
• © ← AltGr+c
• ° ← Shift+AltGr+;
• ¶ ← AltGr+;