See: http://imgur.com/JgjK2.png for example.

Do some serious benchmarking from the commandline. This will write to a file with the time it took to compress n bytes to the file (increasing by 1).

Run:

To see it in graph form.

The "-d" option for gnu's "date" command can calculate positive or negative offset from any time, including "now". You can even specify a source timezone (the output timezone can be set with the TZ environment variable). Useful! Fun! Not very well documented!

This is very useful if you need to show someone some text from a distance. (Like someone standing over your shoulder...)

I'd recommend aliasing it to something like:

alias osd_cat="osd_cat -o 400 -s 8 -c blue -d 60 -f -*-bitstream\ vera\ sans-*-*-*--200-*-*-*-*-*-*-*"

xosd is the utility that provides osd_cat.

This will log your internet download speed.

You can run

to get a graph of it.

The end of unix time and the 32bit era will be Tue Jan 19 03:14:07 UTC 2038

.

date: invalid date [email protected]'

.

In 64bit you have much longer, at least to:

Use tar command for a backup info with a date of creation

This is the same command as this one, but for OS X.

http://www.commandlinefu.com/commands/view/3053/find-out-when-your-billion-second-anniversary-is-was.

This is the same command as this one, but for OS X.

http://www.commandlinefu.com/commands/view/3053/find-out-when-your-billion-second-anniversary-is-was.

Replace 12/31/1970 with your birth date.

Use `zless` to read the content of your *rss.gz file:

Tres lineas en un shell script para copiar la base de datos diaramente

prints out the time for the timezone specified in $offsetutc. So you have less to think about things like: "I'm in utc+4 and my friend in utc-7, can I call him now or will I wake him?"

Note: $offsetutc should be an integer between -12 and 12.

It will create a backup of the filename. The advantage is that if you list the folder the backups will be sorted by date. The command works on any unix in bash.

A quick and simple way of outputting the start and end date of a certificate, you can simply use 'openssl x509 -in xxxxxx.crt -noout -enddate' to output the end date (ex. notAfter=Feb 01 11:30:32 2009 GMT) and with the date command you format the output to an ISO format.

For the start date use the switch -startdate and for end date use -enddate.

Performs a mysqldump and gzip-compresses the output file with a timestamp in the resulting dump file. Inspect the file for integrity or fun with this command afterward, if you desire:

With this command you can get a previous or future date or time. Where can you use this? How about finding all files modified or created in the last 5 mins?

touch -t `echo $(date -d "5 minute ago" "+%G%m%d%H%M.%S")` me && find . -type f -newer me

List all directories created since last week?

touch -t `echo $(date -d "1 week ago" "+%G%m%d%H%M.%S")` me && find . -type d -cnewer me

I'm sure you can think of more ways to use it. Requires coreutils package.

Important to know: a valid date will return 0, otherwise 1!

Use date to find the date at other days and times.

Not a discovery but a useful one nontheless.

In the above example date format is 'yyyymmdd'. For other possible formats see 'man date'.

This command can be also very convenient when aliased to some meaningful name:

This example, for example, produces the output, "Fri Feb 13 15:26:30 EST 2009"

creates a tar.gz with a name like:

backup20090410_173053.tar.gz

of a given directory.

this file was made 10 April 2009 at 5:30:53pm

see date's man page to customize the timestamp format

Echos the number of seconds from the current time till the specified time (Example in command is (2**31-1)) aka the Unix epoch. Just replace that number with the specified date (in seconds past Jan. 1st 1970) and it will return the seconds.

NOTE: Only works in bash