Commands using date sorted by votes

Commands using date (199)

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Speaking alarm clock

This ran on a ubuntu box using espeak for speaking text with the bash shell. On a mac you should use 'say'. Also you can change your alarm interval and your snooze interval which are currently 8 hours and 1 minute. I would run this via cron yet it's easier to disable if you run it as a command like this :P Show Sample Output
This is sample output - yours may be different.
```
Set speakers really loud. Your guests will really love it ;)
```
3

sleep 8h && while [ 1 ] ; do date "+Good Morning. It is time to wake up. The time is %I %M %p" | espeak -v english -p 0 -s 150 -a 100 ; sleep 1m; done

copremesis · 2010-06-23 17:34:54 3
Create a tar file with the current date in the name.
This is sample output - yours may be different.
3

tar cfz backup-$(date --iso).tar.gz somedirs

jasonjgw · 2010-11-17 23:04:27 5
Backup a file with a date-time stamp

1. you don't need to prepend the year with 20 - just use Y instead of y 2. you may want to make your function a bit more secure: buf () { cp ${1?filename not specified}{,$(date +%Y%m%d_%H%M%S)}; }
This is sample output - yours may be different.
3

buf () { cp $1{,$(date +%Y%m%d_%H%M%S)}; }

unefunge · 2010-12-14 14:02:03 3
Yet Another Large Screen Clock
This is sample output - yours may be different.
3

clear; while sleep 1; do d=$(date +"%H:%M:%S"); e=$(echo "toilet -t -f mono12 $d");tput setaf 1 cup 0; eval $e; tput setaf 4 cup 8; eval "$e -F flop";tput cup 0; done

knoppix5 · 2015-05-03 01:51:27 10
Wait for file to stop changing

This loop will finish if a file hasn't changed in the last 10 seconds. . It checks the file's modification timestamp against the clock. If 10 seconds have elapsed without any change to the file, then the loop ends. . This script will give a false positive if there's a 10 second delay between updates, e.g. due to network congestion . How does it work? 'date +%s' gives the current time in seconds 'stat -c %Y' gives the file's last modification time in seconds '$(( ))' is bash's way of doing maths '[ X -lt 10 ]' tests the result is Less Than 10 otherwise sleep for 1 second and repeat . Note: Clever as this script is, inotify is smarter. Show Sample Output
This is sample output - yours may be different.
```
$ touch FILENAME
$ while [ $(( $(date +%s) - $(stat -c %Y FILENAME) )) -lt 10 ]; do sleep 1; done; echo DONE
10 seconds pass
DONE
```
3

while [ $(( $(date +%s) - $(stat -c %Y FILENAME) )) -lt 10 ]; do sleep 1; done; echo DONE

flatcap · 2015-05-09 12:30:13 15
Day of the week of your birthday over the years.

Do you ever want to know which day of week was your birhday! Now you can check that with this command, just set your birh date at the beginning (My bday in the example) and the dates will be revealed. ;) Show Sample Output
This is sample output - yours may be different.
```
...
1999 -> Thursday
2000 -> Saturday
2001 -> Sunday
2002 -> Monday
...
```
3

DAY=01; MONTH=07; YEAR=1979; CURRENT_YEAR=$(date +%Y); for i in $(seq $YEAR $CURRENT_YEAR); do echo -n "$i -> "; date --date "$i-$MONTH-$DAY" +%A; done

nordri · 2018-06-08 07:56:59 246
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. Show Sample Output
This is sample output - yours may be different.
```
2018-04-13 Friday the 13th
2018-07-13 Friday the 13th
2019-09-13 Friday the 13th
2019-12-13 Friday the 13th
2020-03-13 Friday the 13th
2020-11-13 Friday the 13th
2021-08-13 Friday the 13th
2022-05-13 Friday the 13th
2023-01-13 Friday the 13th
2023-10-13 Friday the 13th
2024-09-13 Friday the 13th
2024-12-13 Friday the 13th
2025-06-13 Friday the 13th
```
3

for i in {2018..2025}-{01..12}-13; do [[ $(date --date $i +"%u" | grep 5) != 5 ]] || echo "$i Friday the 13th"; done

test666v2 · 2018-07-10 21:31:02 255
Create backup copy of file, adding suffix of the date of the file modification (NOT today's date)

When I go to change a configuration file I always like to make a backup first. You can use "cp -p" to preserve the modification time, but it gets confusing to have file.prev, file.prev2, etc. So I like to add a YYMMDD suffix that shows when the file was last changed. "stat -c %Y" gives you the modification time in epoch seconds, then "date -d @" converts that to whatever format you specify in your "+format" string. Show Sample Output
This is sample output - yours may be different.
```
# ls -l
-rw-r--r-- 1 root root 0 Dec 31  2018 file
# cp -p file file.$(date -d @$(stat -c '%Y' file) "+%y%m%d")
 ls -l
-rw-r--r-- 1 root root 0 Dec 31  2018 file
-rw-r--r-- 1 root root 0 Dec 31  2018 file.181231
 
```
3

cp file file.$(date -d @$(stat -c '%Y' file) "+%y%m%d")

dmmst19 · 2019-07-18 18:09:09 152
Create backup copy of file, adding suffix of the date of the file modification (NOT today's date)

If your `date` command has `-r` option, you don't need `stat`
This is sample output - yours may be different.
3

cp file{,.$(date -r file "+%y%m%d")}

brx75x · 2019-09-19 09:42:38 164
stream a youtube video with mpv where $1 is the youtube link.

opens a new session with video stream
This is sample output - yours may be different.
3

setsid mpv --input-ipc-server=/tmp/mpvsoc$(date +%s) -quiet "$1" >/dev/null 2>&1

n0a110w · 2020-02-10 12:35:11 87
Convert a date to timestamp

Simple way to get a timestamp from a date Show Sample Output
This is sample output - yours may be different.
```
1233914274
```
2

date --utc --date "2009-02-06 09:57:54" +%s

michelem · 2009-02-06 08:29:12 10
Validate date, also a date within a leap year

Important to know: a valid date will return 0, otherwise 1!
This is sample output - yours may be different.
2

date -d2009-05-18 > /dev/null 2>&1 ; echo $?

GeckoDH · 2009-05-18 20:30:05 4
Output a SSL certificate start or end date

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. Show Sample Output
This is sample output - yours may be different.
```
2009-02-01
```
2

date --date="$(openssl x509 -in xxxxxx.crt -noout -startdate | cut -d= -f 2)" --iso-8601

rez0r · 2009-07-23 23:24:33 10
Leap year calculation
This is sample output - yours may be different.
2

leapyear() { [ $(date -d "Dec 31, $1" +%j) == 366 ] && echo leap || echo not leap; }

taliver · 2010-03-30 20:13:56 36
make directory with current date

Show Sample Output
This is sample output - yours may be different.
```
gnu@robby:/tmp/$ mkdir $(date +%Y_%m_%d) 
gnu@robby:/tmp/$ ls 
2010_04_16
```
2

mkdir $(date +%Y_%m_%d)

eastwind · 2010-04-16 17:23:40 8
make directory with current date
This is sample output - yours may be different.
2

mkdir $(date +%F)

pusakat · 2010-04-20 12:20:23 5
How to backup hard disk timely?

'data' is the directory to backup, 'backup' is directory to store snapshots. Backup files on a regular basis using hard links. Very efficient, quick. Backup data is directly available. Same as explained here : http://blog.interlinked.org/tutorials/rsync_time_machine.html in one line. Using du to check the size of your backups, the first backup counts for all the space, and other backups only files that have changed. Show Sample Output
This is sample output - yours may be different.
```
/backup# du -hs .
1.5G	.
/backup# du -hs *
1.4G	201008042142
15M	201008042150
24M	201008050022
/backup# du -hs 201008042142; du -hs 201008050022
1.4G	201008042142
1.4G	201008050022
```
2

rsync -av --link-dest=$(ls -1d /backup/*/ | tail -1) /data/ /backup/$(date +%Y%m%d%H%M)/

dooblem · 2010-08-05 19:36:24 6
"at" command w/o the resource usage/competition issues

EXAMPLES jb "next sun 12pm" "/bin/sh ~you/1.sh" & jb "2010-08-29 12:00:00" "~you/1.sh" & jb "29aug2010 gmt" ". ~you/1.sh" & jb 12:00p.m. "nohup ./1.sh" & jb 1min "echo stop!" & SEE ALSO parsedate(3) strftime(3)
This is sample output - yours may be different.
2

jb() { if [ -z $1 ];then printf 'usage:\njb <"date and/or time"> <"commandline"> &\nsee parsedate(3) strftime(3)\n';else t1=$(date +%s); t2=$(date -d "$1" +%s) ;sleep $(expr $t2 - $t1);$2 ;fi ;}

argv · 2010-08-26 23:50:42 3
Format date/time string for a different day

The "date' command has options to easily format the date, day, month, time, etc. But what if you want a relative date or time. Like, I wanted yesterday's date in a particular format. You may want the exact date of "2 months ago" or "-3 days" nicely formatted. For that, you can use this command. The --date option takes fuzzy parameters like the ones mentioned in the previous sentence. Show Sample Output
This is sample output - yours may be different.
```
me@my-laptop:~$ date
Wed Sep  8 17:55:57 IST 2010
me@my-laptop:~$ date --date=yesterday +%Y%m%d
20100907
```
2

date --date=yesterday +%Y%m%d

vinayv · 2010-09-08 12:29:31 3
Binary clock

cryptic version Show Sample Output
This is sample output - yours may be different.
```
...#
..#.
..#.
..##
```
2

read -a A <<<"8 9 5 10 6 0 3 11 7 4";B='.*.**..*....***';for C in $(date +"%H%M"|fold -w1);do echo "${B:${A[C]}:4}";done

unefunge · 2010-11-26 11:29:23 5
Synchronize date and time with a server over ssh

If you are stuck behind a firewall and want to synchronize time with another server but you do not want to port forward NTP (which uses UDP) then this command is handy. It gets the time from a server and sets the local time. It is not that accurate but I can live with a second or so drift. Show Sample Output
This is sample output - yours may be different.
```
2011011110:28:12
```
2

date +%Y%m%d%T -s "`ssh user@server 'date "+%Y%m%d %T"'`"

unixmonkey16473 · 2011-01-11 10:33:32 3
Get the time since epoch

Get the time since epoch. Useful when working with commands and logs which use this format.
This is sample output - yours may be different.
2

date +%s

akhilravidas · 2012-03-12 00:14:22 3
backup your history

simple and easy backup your history with timestamp Show Sample Output
This is sample output - yours may be different.
```
ls -la ~/history-save*
-rw-r--r-- 1 dan dan 80185 Aug 12 19:07 /home/user/history-save-12-08-12-19:07:09
-rw-r--r-- 1 dan dan 95387 Aug 18 11:38 /home/user/history-save-18-08-12-11:38:16
```
2

history > ~/history-save-$(date +%d-%m-%y-%T)

unixmonkey14859 · 2012-08-18 07:40:33 4
sleep until X o'clock

pauses exactly long enough to wake at the top of the hour
This is sample output - yours may be different.
2

sleep $((3600 - ($(date +%s) % 3600) ))

Mozai · 2012-12-09 16:21:57 17

fork performance test

grabbed from Andrew Aylett post: http://superuser.com/questions/133313/can-i-speed-up-cygwins-fork Show Sample Output

while (true); do date --utc; done | uniq -c

hute37 · 2013-03-15 12:05:37 39

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Unzip multiple files with one command

With this command you can easily unzip multiple zip files with just one command. All you need to do is to use single quotes.

count the number of specific characters in a file or text stream

In this example, the command will recursively find files (-type f) under /some/path, where the path ends in .mp3, case insensitive (-iregex). It will then output a single line of output (-print0), with results terminated by a the null character (octal 000). Suitable for piping to xargs -0. This type of output avoids issues with garbage in paths, like unclosed quotes. The tr command then strips away everything but the null chars, finally piping to wc -c, to get a character count. I have found this very useful, to verify one is getting the right number of before you actually process the results through xargs or similar. Yes, one can issue the find without the -print0 and use wc -l, however if you want to be 1000% sure your find command is giving you the expected number of results, this is a simple way to check. The approach can be made in to a function and then included in .bashrc or similar. e.g. $ count_chars() { tr -d -c "$1" | wc -c; } In this form it provides a versatile character counter of text streams :)

Reset hosed terminal,

stty sane resets the tty to basic usable function. The ^J is a newline -- sometimes CR/LF interpretation is broken so use the ^J explicitly.

Find all files currently open in Vim and/or gVim

Catches .swp, .swo, .swn, etc. If you have access to lsof, it'll give you more compressed output and show you the associated terminals (e.g., pts/5, which you could then use 'w' to figure out where it's originating from): lsof | grep '\.sw.$' If you have swp files turned off, you can do something like: ps x | grep '[g,v]im', but it won't tell you about files open in buffers, via :e [file].

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" }

Create a new file

Delicious search with human readable output

You can install filterous with $ sudo apt-get install libxslt1-dev; sudo easy_install -U filterous

Split lossless audio (ape, flac, wav, wv) by cue file

Get AWS temporary credentials ready to export based on a MFA virtual appliance

You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials

Find all files with colons and replace with underscores; current directory and below (recursive).

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Commands using date (199) the last day the last week the last month all time sorted by date votes

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Commands using date (199)

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