Used in OS X. tr "\n" ";" may be replaced by echo ";" with linux versions of date. I reused ping -q -c 1 www.google.com|tail -1|cut -d/ -f5 Show Sample Output

My first command :) I made this command to log public addresses of a virtual interface who connects random VPN servers around the world. Show Sample Output

Useful if localhost is a small machine running BusyBox, which uses a slightly unusual format to set the date. Remotehost can be pretty much any Linux machine, including one running BusyBox. Uses UTC for portability.

The easiest way to convert epoch date to human readable format. Show Sample Output

Downloads a CRL file, determines the expiration time, and checks when it will expire Show Sample Output

Calculate Sysadmin day of any given year using 2 `date`. Code based on http://stackoverflow.com/a/5656859/196133 Show Sample Output

This function will find the modification time in unix_time of the given file, then calculate the number of minutes from now to then and then find all files modified in that range. Show Sample Output

this command can be added to crontab so as to execute a nightly backup of directories and store only the 10 last backup files.

Take screen shot using Tizen SDK cd ~ # go to you home directory fn=$(date "+ screen-%H-%M-%S") # create variable for file name in bash sdb shell xwd -root -out /tmp/"$fn".xwd # open shell and run command to save screenshot sdb pull /tmp/"$fn".xwd ~/ # copy created file into your home directory convert "$fn".xwd "$fn".png # converting xwd to png in your home

usage = crontest "/path/to/bin" This version of this function will echo back the entire command so it can be copied/pasted to crontab. Should be able to be automagically appended to crontab with a bit more work. Tested on bash and zsh on linux,freebsd,aix Show Sample Output

s/espeak/say/ on a mac

I have this in my .bash_aliases and call it before running apt-get install or apt-get upgrade Example: alias apt-install='apt-update; apt-get install' alias apt-upgrade='apt-update; apt-get upgrade' function apt-update () { if [[ $(expr $(date +%s) - $(stat -c %X /var/lib/apt/periodic/update-success-stamp)) -gt 86400 ]]; then sudo apt-get update else echo apt is up to date fi }

For OS X/bsd; probably messy

This works out of the box in Mac Os X Show Sample Output

Creates a full backup of router's /etc (and any other files or directories specified in /etc/sysupgrade.conf) that gets stored into the computer as a tarball named with full date and time (YYYY-MM-DD-HH:MM).

minimal oneliner to keep track of time Show Sample Output

IMPORTANT: You need Windows PowerShell to run this command - in your Windows Command Prompt, type powershell Create a log file of your Motorola Surfboard SB6141 downstream signal strengths. Uses the built-in curl to request signal strength data from your SB6141 cable modem. HTML page 192.168.100.1/cmSignalData.htm has the signal strength numbers for the 8 downstreams. Some HTML/DOM processing parses out the 8 values from the above page. The eight extracted signal strengths are then logged to a file. A small while-loop watches the clock & repeats the process every 10 seconds. Show Sample Output

IMPORTANT: You need Windows PowerShell to run this command - in your Windows Command Prompt, type powershell Uses sajb to start a PowerShell background job that pings an IP host every 10 seconds. Any changes in the host's Up/Down state is time-stamped and logged to a file. Date/time stamps are logged in two formats: Unix and human-readable. A while(1) loop repeats the test every 10 seconds by using the sleep command. See the Sample Output for more detail. I use this command to log Up/Down events of my Motorola SB6141 cable modem (192.168.100.1). To end the logging, close the PowerShell window or use the "exit" command. Show Sample Output

This will return a nice finish date and time when you're rebuilding a software raid array.

echo 'Current hour' hour=$(date +%H) if [ $hour -gt 9 -a $hour -lt 23 ]; then echo -n '*'; else echo -n '#'; fi; echo ' '$hour; echo 'Test around the clock:' for hour in {0..23} {0..23}; do if [ $hour -gt 9 -a $hour -lt 23 ]; then echo -n '*'; else echo -n '#'; fi; echo ' '$hour; done echo 'If you need to depend on UTC, just add `-u` flag to `date` command' Show Sample Output

A way for tracking times in bash Show Sample Output

Just add a format to chronometer in bash Show Sample Output