Bash

Fill a file with random data

dd if=/dev/urandom of=target-file bs=1M count=1000000

Suggested header

set -euxo pipefail

• -e Abort script at first error, when a command exits with non-zero status (except in until or while loops, if-tests, list constructs)
• -u Attempt to use undefined variable outputs error message, and forces an exit
• -v Print each command to stdout before executing it
• -x Similar to -v, but expands commands
• -o pipefail Causes a pipeline to return the exit status of the last command in the pipe that returned a non-zero return value

http://www.tldp.org/LDP/abs/html/options.html

Iterate over directories

find . -maxdepth 1 -mindepth 1 -type d -exec basename '{}' \;

Parsing options

REMOTE=
PUSH=0

while getopts "r:p" OPTION; do
case $OPTION in
  r)
    REMOTE=$OPTARG
    ;;
  p)
    PUSH=1
    ;;
  ?)
    usage
    exit
    ;;
  esac
done

Exec wrapper

#!/bin/bash

on_die ()
{
  # kill all children
  pkill -KILL -P $$
}

trap 'on_die' TERM
ffmpeg -i rtmp://localhost/myapp/$1 -c copy -f flv rtmp://localhost/myapp2/$1 &
wait

Filename

function filename {
  return ${1%%.*}
}

Extension

function extname {
  return ${1#*.}
}