Commands using ls (517)

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Get your outgoing IP address
should be very consistent cause it's google :-)

Let your computer lull you to sleep
Can change language and speed, see espeak man page for options. (Install espeak in your linux distro via yum or apt-get) For insomniacs you may need to enclose in a while true; do ...; done loop ;)

Recursively compare two directories and output their differences on a readable format

Calculate days on which Friday the 13th occurs (inspired from the work of the user justsomeguy)
Friday is the 5th day of the week, monday is the 1st. Output may be affected by locale.

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" }

Change string in many files at once and more.
Find all files that contain string XXX in them, change the string from XXX to YYY, make a backup copy of the file and save a list of files changed in /tmp/fileschanged.

JSON processing with Python
Validates and pretty-prints the content fetched from the URL.

create dir tree
create tree of dir's in one command

MPD + Digitally Imported
1.- Enter into the playlist path. 2.- Run the command. 3.- Playlists created!

read unixtimestamp with festival
you will hear how many seconds since 1.1.1970 in english words with billions, millions and thousands. this is very useful, if you want to get over to use the unixtimestamp instead of the 24 hour clock in your dayly life


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