Yay Fun Hack

gistfile1.sh

#!/bin/bash

# Don't allow unset variables
set -o nounset
# Exit if any command gives an error
set -o errexit

# Constants
LOG_DIR=$HOME/tmp

LOG_FILE="${LOG_DIR}"/test.log
LOG_PIPE=/tmp/${0##*/}.pipe

setup () {
    if [ ! -e "${LOG_PIPE}" ]; then
        mkfifo "${LOG_PIPE}"
    fi

    if [ -e "${LOG_FILE}" ]; then
        rm "${LOG_FILE}"
    fi

    # Redirect stdout and stderr through tee to simultaneously
    # log and display
    exec 3>&1 4>&2
    tee "${LOG_FILE}" < "${LOG_PIPE}" >&3 &
    tee_pid=$!
    exec > >(
	while read line; do
	    echo $(date +"%Y/%m/%d %H:%M:%S")"| ${line}"
	done > "${LOG_PIPE}" 2>&1
    )

    trap cleanup EXIT HUP INT QUIT TERM
}

cleanup () {
    # Close temporary file descriptors for stdout and stderr
    exec 1>&3 3>&- 2>&4 4>&-
    wait $tee_pid
    rm -f "${LOG_PIPE}"
}

dostuff () {
    for i in $(seq 1 100); do
	local count=$[ ( $RANDOM % 55 ) + 1 ]

	for j in $(seq 1 $count); do
	    echo -n "${j} "
	done

	echo ""
    done
}

setup
dostuff