Useful /bin/sh functions

functions.sh

_NORMAL=$(printf "\033[0m")
_RED=$(printf "\033[0;31m")
_CYAN=$(printf "\033[0;36m")

_log() {
    local _cmd="$@"
    printf "${COLOUR:+${_RED}}"
    printf "%s [%s] %-40s\n" "$(date '+%b %d %T')" $name "CMD: $_cmd"
    printf "${COLOUR:+${_CYAN}}"
    eval "$_cmd" 2>&1 | sed -e 's/^/     | /'
    local _status=$?
    printf "${COLOUR:+${_RED}}"
    [ $_status -eq 0 ] && printf "[OK]\n" || printf "[ERROR]\n"
    printf "${COLOUR:+${_NORMAL}}"
    return $_status
}

_backup() {
    local _f=$1
    if [ ! -f ${_f}.ovh ]
    then
        printf "Backing up file: %s -> %s.ovh " $_f $_f
        cp ${_f} ${_f}.ovh && printf "[OK]\n"
    else
        printf "Backup file %s.ovh exists\n" $_f
    fi
}

_config() {
    [ "$1" = "-echo" ] && shift && local _echo=1
    local _var="$1"
    local _msg="$2"
    local _default="$3"
    local _r
    if [ ${#_default} -gt 0 ]
    then
        read -p "${_msg} [${_default}]: " _r
    else
        read -p "${_msg}: " _r
    fi
    eval ${_var}=\"${_r:-${_default}}\"
    [ "${_echo}" = 1 ] && eval echo \$${_var}
}