Linux kernel hacking: process containers

A basic overview of the Linux cgroups. My article is available at stacktrace.it (in italian).

battery life in bash prompt

I've just reconfigured my .bashrc to execute this bash script that allows to show the perentage of battery life at the beginning of the command prompt. Geeze, really nice! :) At this point I can turn off the guidance-power-manager applet and enjoy a faster boot.

#!/bin/bash
GRAY="1;30"
CYAN="0;36"
LIGHT_CYAN="1;36"
LIGHT_BLUE="1;34"
YELLOW="1;33"
WHITE="0;1"
NO_COLOR="0"
LIGHT_RED="1;31"
LIGHT_GREEN="1;32"
BROWN="0;33"

function battery_info()
{
    BATT_INFO=$(acpi -b | awk -F', ' '{print $2}')
    AC_INFO=$(acpi -aB | awk -F': ' '{print $2}')

    if [ $AC_INFO = "off-line" ]; then
        BATT_PERC=${BATT_INFO:0:${#BATT_INFO}-1}

        if [ $BATT_PERC -ge 75 ]; then
            COLOR=$LIGHT_GREEN
        elif [ $BATT_PERC -le 25 ]; then
            COLOR=$LIGHT_RED
        else
            COLOR=$YELLOW
        fi
    else
        COLOR=$NO_COLOR
    fi
}

PROMPT_COMMAND=battery_info
PS1="\[\033[\$(echo -n \$COLOR)m\]\$(echo -n \$BATT_INFO)\
\[\033[${NO_COLOR}m\] \u@\h:\[\033[${WHITE}m\]\w\[\033[${NO_COLOR}m\]\$ "