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 ;; Open the default file if it is present. 
(if (file-exists-p "~/org/TODO.org") 
    (setq initial-buffer-choice "~/org/TODO.org"))

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sleep 15; import xxx.jpg;

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;; This is a function copied from stackoverflow to facify #if 0/#else/#endif keywords.
;; The comments are added by myself to make it understandable. 
(defun my-c-mode-font-lock-if0 (limit)
  (save-restriction
    (widen)
    (save-excursion
      (goto-char (point-min))
      (let ((depth 0) str start start-depth)
	;; Search #if/#else/#endif using regular expression.
        (while (re-search-forward "^\\s-*#\\s-*\\(if\\|else\\|endif\\)" limit 'move)

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#!/bin/sh
 
if [ -t 0 ]
then
   echo "Input is a terminal"
else
   echo "Input is NOT a terminal"
fi

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Modern Unix systems use user groups to control access privileges. The wheel group is a special user group used on some Unix systems to control access to the su command, which allows a user to masquerade as another user (usually the super user).

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1. pacmd is a good tool to help you get current pulseaudio information.
   list-sinks
   list-clients

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mplayer2  -dumpstream /dev/sr0 -nocache -noidx -dumpfile record.mp4

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ifname=$1

let bytes1=0
while true; do
        let bytes2=`ip -s link  show $ifname  | grep -A 1 RX | grep -v RX | awk '{print $1}'`
        let diff=(bytes2 - bytes1)
        let diff=(diff / 1024 / 1024)
        echo "bandwitdth is $diff Mbps"
        let bytes1=bytes2
        sleep 1

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ps -eo rss,pid,comm  |  awk '{s+=$1} END {print s}'

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import eventlet
pool = eventlet.GreenPool()
def bomb():
	a = eventlet.connect(("127.0.0.1", 9697))
	eventlet.sleep(10)
	a.close()
	
i=0
while i<5000:
	pool.spawn(bomb)