bash functions

bash_functions

swaptop () 
{ 
    l="${1:-20}";
    for file in /proc/*/status;
    do
        awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file;
    done | sort -k 2 -n -r | head -$l
}

urlencode() {
    # urlencode <string>
    local length="${#1}"
    for (( i = 0; i < length; i++ )); do
        local c="${1:i:1}"
        case $c in
            [a-zA-Z0-9.~_-]) printf "$c" ;;
            *) printf '%%%02X' "'$c" ;;
        esac
    done
}

urldecode() {
    # urldecode <string>

    local url_encoded="${1//+/ }"
    printf '%b' "${url_encoded//%/\\x}"
}

rotate ()
{
    [ -f $1.3 ] && mv -f $1.3 $1.4;
    [ -f $1.2 ] && mv -f $1.2 $1.3;
    [ -f $1.1 ] && mv -f $1.1 $1.2;
    [ -f $1 ] && mv -f $1 $1.1
}

• swaptop: find processes that use the most swap space
• urlencode: encode url
• urldecode: decode url
• rotate: keep backup copies