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#!/bin/bash #--------------------------------------------------------------------- # Script to display a byobu notification "history graph". # # Designed to work with the wonderful byobu(1) but can be run # stand-alone. #--------------------------------------------------------------------- # # Copyright (C) 2011 Canonical Ltd. # # Author: James Hunt <james.hunt@canonical.com> # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, version 3 of the License. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # #--------------------------------------------------------------------- PKG="byobu" [ -r "$HOME/.byoburc" ] && . "$HOME/.byoburc" [ -z "${BYOBU_PREFIX}" ] && export BYOBU_PREFIX="/usr" || export BYOBU_PREFIX . "${BYOBU_PREFIX}/lib/${PKG}/include/common" script_name=${0##*/} min_default=0 max_default=100 points_default=5 theme_default=vbars_8 newline="\n" rotate=y error() { msg="$*" echo "ERROR: $msg" >&2 } die() { error "$*" exit 1 } usage() { cat <<EOT Description: Display a graph of historical indicator values using byobu-ulevel. Usage: $script_name [options] [command [args...]] Options: -f <file> : File to read data points from. (only required if no command specified). -h : Show this help. -m <num> : Minimum value (default=$min_default). -n : Supress output of newline character. -p <points> : Specify number of data points in graph (default=$points_default). -r : Do not rotate file <file> (default is to rotate). Option implies file <file> should not be written to so a command cannot follow script options in this case. -t <theme> : 'byobu-ulevel' theme to use (default=$theme_default). -x <num> : Maximum value (default=$max_default). Examples: Using $script_name to run a command, rotate log and display graph. Here we specify a command to display available memory. Trailing echo adds a required newline Note no filename specified. $script_name "(/usr/lib/byobu/mem_used | sed -e 's/% //g';echo)" Using $script_name just to rotate log and display the graph file=/tmp/load.dat awk '{ print \$1}' /proc/loadavg >> \$file # Note: we need to specify what we consider to be a "reasonable" maximum load $script_name -m 3.0 -f \$file Notes: - If you specify 'command', care must be taken with shell quoting to avoid expansion prior to this script running the command. - If '-r' is not specified, the file <file> will be rotated such that at most <points> lines are retained on each invocation of this script. EOT } get_data() { needed_lines=$points if [ ! -f $file ] then return fi lines=$(wc -l $file|awk '{print $1}') if [ $lines -lt $needed_lines ] then # insufficient data return fi bytes=$(<${file}) bytes=$(echo "$bytes"|tail -n ${needed_lines}) [ $lines -eq $needed_lines -o $rotate = n ] && echo "$bytes" && return # rotate tmp=`tempfile` echo "$bytes" > $tmp mv $tmp $file echo "$bytes" } while getopts "f:hm:np:rt:x:" opt do case "$opt" in f) file="$OPTARG" ;; h) usage exit 0 ;; m) min=$OPTARG ;; n) newline= ;; p) points=$OPTARG ;; r) rotate=n ;; t) theme="$OPTARG" ;; x) max=$OPTARG ;; esac done shift $[$OPTIND-1] cmd="$@" [ -z "$theme" ] && theme=$theme_default if [ -z "$cmd" ] then if [ -z "$file" ] then error "must specify file" usage exit 1 fi fi if [ -z "$file" ] then # we could go cryptic+safe by calling tempfile(1), but that then # makes it very difficult to find in case of need. file=/tmp/${USER}-${script_name}-$$.dat fi [ -z "$min" ] && min=$min_default [ -z "$max" ] && max=$max_default [ -z "$points" ] && points=$points_default if [ ! -z "$cmd" ] then if [ $rotate = n ] then error "cannot write to file if rotate disabled" usage exit 1 fi eval "$cmd >>$file" fi data=$(get_data) [ -z "$data" ] && printf "%*.s${newline}" $points && exit 0 for datum in $data do byobu-ulevel -n -m $min -x $max -p -c $datum -t $theme done