Commands by kiiwii

Commands by kiiwii (4)

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Let you vanish in the (bash) history.

hide your ass, buddy.
This is sample output - yours may be different.
0

export HISTSIZE=0

kiiwii · 2012-11-17 14:12:34 6
show you the time when you lost the remote server.

Run this within a steady screen session. You can get the approximate time when the remote server went down or other abnormal behavior.
This is sample output - yours may be different.
-3

ssh remotehosts;date

kiiwii · 2012-11-09 01:14:24 5
remove a directory filled with too many files

rm /SOME/PATH/*, when you hit "argument list too long".
This is sample output - yours may be different.
0

find /SOME/PATH -type f -execdir rm -f {} \+

kiiwii · 2012-06-15 05:32:31 8
make a central proxy access from where it's high speed link available.

Say I have configured a fully optimized squid server A listen on [xxxx:xxxx::xxxx]:3128, within ISP_foo. But when I was with ISP_bar , I can not access the proxy with full speed due to ISP's limit upon the normal clients among different ISP. If you are curious where the ridiculous ISPs are, I'll tell you the truth --that's CHINA. However, servers' network connection is not enslaved to that limitation, especially with IPv6. So, I can do this socat linefu on a server B of ISP_bar. me >> B(ISP_bar)>> A(ISP_foo)
This is sample output - yours may be different.
0

socat TCP4-LISTEN:3128,reuseaddr,fork TCP6:[xxxx:xxxx::xxxx]:3128

kiiwii · 2012-06-07 04:35:24 4

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Top 10 Memory Processes (reduced output to applications and %usage only)

To have only unique lines in a file

Converts uppercase chars in a string to lowercase

Another alternative is to define a function: lower() { echo ${@,,} } lower StrinG

Clean your broken terminal

When some console full-screen program (minicom, vi, some installers) breaks down your terminal, try this command to revert all options to "sane" settings (sane is a built-in combo of a lot of stty options)

Sort output by column

(separator = $IFS)

Start dd and show progress every X seconds

Adjust "sleep X" to your needs. *NOTE: First sleep is required because bash doesn't have a "post-test" syntax (do XXX while).

Capture screen and mic input using FFmpeg and ALSA

Yet another x11grab using ffmpeg. I also added mic input to the capturing video stream using alsa. Yet I need to find out how to capture audio which is currently playing.

Detach a process from the current shell

Continue to execute the command in background even though quitting the shell.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

check open ports without netstat or lsof

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