Commands by KennethIWilliams (0)

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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" }

Analyze awk fields
translate and number lines is simpler and you use tr to choose your delimiter (eg for csv files)

List your MACs address

permanently let grep colorize its output
This will create a permanent alias to colorize the search pattern in your grep output

list block devices
Shows all block devices in a tree with descruptions of what they are.

remove newlines from specific lines in a file using sed

Write comments to your history.
A null operation with the name 'comment', allowing comments to be written to HISTFILE. Prepending '#' to a command will *not* write the command to the history file, although it will be available for the current session, thus '#' is not useful for keeping track of comments past the current session.

a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

for all who don't have the watch command
#Usage: watch timeinsecond "command"

Run netcat to server files of current folder

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