Commands by dizzgo (7)

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get all Google ipv4/6 subnets for a iptables firewall for example (updated version)
google has added 2 more netblocks...

Sort by IP address

mount a cdrom

Count number of files in subdirectories
For each directory from the current one, list the counts of files in each of these directories. Change the -maxdepth to drill down further through directories.

Convert seconds to [DD:][HH:]MM:SS
Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

Get the IP address of a machine. Just the IP, no junk.

List the binaries installed by a Debian package
GNU grep's perl-compatible regular expression(PCRE).

Forwards connections to your port 2000 to the port 22 of a remote host via ssh tunnel

Enter a command but keep it out of the history
Put a space in front of your command on the command line and it will not be logged as part of your command line history.

drop first column of output by piping to this
An advantage is that this doesn't modify remained string at all. One can change {0,1} with {0,n} to drop several columns


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