Commands using watch

#Usage: watch timeinsecond "command"

Locally watch MySQL process list update every 5s on a remote host. While you watch pipe to a file. The file out put is messy though but hey at least you have a history of what you see.

watch is a command especially designed for doing this job

to omit "grep -v", put some brackets around a single character

Shows all those processes; useful when building some massively forking script that could lead to zombies when you don't have your waitpid()'s done just right.

Use the command watch, which is really hard to pass nested quotes to, and insert newlines where they are supposed to go in the HTTP request. that is after 1.1 after the host and two newlines at the end before the EOF.

i use this all day

what? no support for HEREDOCs on commandlinefu's interface? need more fu.

www.fir3net.com

This command displays a clock on your terminal which updates the time every second. Press Ctrl-C to exit.

A couple of variants:

A little bit bigger text:

You can try other figlet fonts, too.

Big sideways characters:

This requires a particular version of banner and a 40-line terminal or you can adjust the width ("30" here).

evento.sh needed for awk syntax

the aplay command makes a camera sound. It takes a picture of who looked at the display

#!/bin/bash

# evento.sh: deteta evento e fala

awk '{print}' | espeak -v pt -stdin

awk '/e/{print "emergencia"}' | espeak -v pt -stdin

aplay -q /home/mm/bash/camera.wav # -q inibe verbose do comand aplay

exit 0

Other logs can be monitored similarly, e.g.

An improved version of http://www.commandlinefu.com/commands/view/1772/simple-countdown-from-a-given-date that uses Perl to pretty-print the output. Note that the GNU-style '--no-title' option has been replaced by its one-letter counterpart '-t'.

Might be more useful if you were able to print it in Days HH:MM:SS format as:

But I'm not exactly sure how to replace the 234234 with the output of the countdown time. (Having some problems with nested quoting/command substitution). Help would be appreciated :)

The idea was originally stolen from Linux Journal. 'wget' pulls the debt clock and 'sed' reformats it for general consumption. Prefacing the command with 'watch' simply sets an interval - in this case every 10 seconds.

'watch' repeatedly (default every 2 seconds, -n 1 => every second) runs a command (here ':', a shorthand for 'true'), displays the output (here nothing) and the date and time of the last run.

I thought it to be obvious but it seemingly is not: to exit use Ctrl-C.

helps you keep watch on the load of a system, without having to stare constantly at the terminal. The -d argument to watch highlights the difference from the last run, making it easier to note how the load is fluctuating. The sed command just strips off the information about how long the box has been up, and how many users are logged in.

verifry if link detected or no and speed of network.

Useful for monitoring both MySQL and the server load at the same time.

Watch the number of packets/bytes coming through the firewall. Useful in setting up new iptables rules or chains. Use this output to reorder rules for efficiency.