ttyplot1

Usage

Overview

ttyplot takes data from standard input, most commonly some tool like ping(1), snmpget(1), netstat(8), ifconfig(8), sar(1), vmstat(8), etc., and plots in text mode on a terminal in real time.

Supports rate calculation for counters and up to two graphs on a single display using reverse video for second line.

The following options are supported:

-2

Read two values and draw two plots, the second in reverse video.

-r

Calculate counter rate and divide by measured sample interval.

-c plotchar

Use plotchar for the plot line, e.g. ‘@ # % .’ etc.

-e errcharmax

Use errcharmax for plot error line when value exceeds hardmax. Default: ‘e’.

-E errcharmin

Use errcharmin for plot error symbol, displayed when plot value is less than hardmin. Default: ‘v’.

-s softmax

Use softmax as the initial maximum value but allow it to grow with input.

-m hardmax

Use hardmax as a hard value limit after which an error line will be drawn( see -e). Should be greater than hardmin, if set.

-M hardmin

Use hardmin as a definite minimum limit of the plot range. If a plot value is less than this, error symbol will be drawn( see -E).

-t title

Use title as the plot title.

-u unit

Label the vertical axis unit.

-v

Print the current version and exit.

-h

Print this help message and exit.

Key bindings

When reading data from a pipe, ttyplot accepts the following commands typed at the terminal:

q

Quit.

r

Toggle "rate mode" on and off.

Examples

CPU usage from vmstat(8) using awk(1) to pick the right column:

vmstat -n 1 \
 | gawk '{ print 100-int($(NF-2)); fflush(); }' \
 | ttyplot

CPU usage from sar(1) with title and fixed scale to 100%:

sar 1 \
 | gawk '{ print 100-int($NF); fflush(); }' \
 | ttyplot -s 100 -t "cpu usage" -u "%"

Memory usage from sar(1), using perl(1), to pick the right column:

sar -r 1 \
 | perl -lane 'BEGIN{$|=1} print "@F[5]"' \
 | ttyplot -s 100 -t "memory used %" -u "%"

Number of processes in running and io blocked state:

vmstat -n 1 \
 | perl -lane 'BEGIN{$|=1} print "@F[0,1]"' \
 | ttyplot -2 -t "procs in R and D state"

Load average via uptime(1) and awk(1):

{ while true; do
    uptime | gawk '{ gsub(/,/, ""); print $(NF-2) }'
    sleep 1
  done } | ttyplot -t "load average" -s load

Ping plot with sed(1):

ping 8.8.8.8 \
 | sed -u 's/^.*time=//g; s/ ms//g' \
 | ttyplot -t "ping to 8.8.8.8" -u ms

WiFi signal level in -dBM (higher is worse) using iwconfig(8):

{ while true; do
    iwconfig 2>/dev/null \
     | grep "Signal level" \
     | sed -u 's/^.*Signal level=-//g; s/dBm//g'
    sleep 1
  done } | ttyplot -t "wifi signal" -u "-dBm" -s 90

CPU temperature from proc;

{ while true; do
    awk '{ printf("%.1f0, $1/1000) }' \
         /sys/class/thermal/thermal_zone0/temp
    sleep 1
  done } | ttyplot -t "cpu temp" -u C

Fan speed from sensors(1) using grep(1), tr(1) and cut(1):

{ while true; do
    sensors | grep fan1: | tr -s " " | cut -d" " -f2
    sleep 1
  done } | ttyplot -t "fan speed" -u RPM

Bitcoin price chart using curl(1) and jq(1):

{ while true; do
    curl -sL https://api.coindesk.com/v1/bpi/currentprice.json \
     | jq .bpi.USD.rate_float
    sleep 600
  done } | ttyplot -t "bitcoin price" -u usd

Stock quote chart:

{ while true; do
    curl -sL https://api.iextrading.com/1.0/stock/googl/price
    echo
    sleep 600
  done } | ttyplot -t "google stock price" -u usd

Prometheus load average via node_exporter:

{ while true; do
    curl -s  http://10.4.7.180:9100/metrics \
     | grep "^node_load1 " \
     | cut -d" " -f2; sleep 1
  done } | ttyplot

sar -n DEV 1 | gawk '{
  if($6 ~ /rxkB/) {
     print iin/1000;
     print out/1000;
     iin=0;
     out=0;
     fflush();
  }
  iin=iin+$6;
  out=out+$7;
}' | ttyplot -2 -u "MB/s"

ttg -i 10 -u Mb 10.23.73.254 public 9 \
 | gawk '{ print $5,$8; fflush(); }' \
 | ttyplot -2 -u Mb/s

snmpdelta -v 2c -c public -Cp 10 \
          10.23.73.254 1.3.6.1.2.1.2.2.1.{10,16}.9 \
 | gawk '{ print $NF/1000/1000/10; fflush(); }' \
 | ttyplot -2 -t "interface 9 throughput" -u Mb/s

iostat -xmy 1 nvme0n1 \
 | stdbuf -o0 tr -s " " \
 | stdbuf -o0 cut -d " " -f 4,5 \
 | ttyplot -2 -t "nvme0n1 throughput" -u MB/s

{ while true; do
    snmpget  -v 2c -c public \
             10.23.73.254 1.3.6.1.2.1.2.2.1.{10,16}.9 \
     | awk '{ print $NF/1000/1000; }'
    sleep 10
  done } | ttyplot -2 -r -u "MB/s"

{ while true; do
    ip -s -j link show enp0s31f6 \
     | jq '.[].stats64.rx.bytes/1024/1024, \
           .[].stats64.tx.bytes/1024/1024'
    sleep 1
  done } | ttyplot -r -2 -u "MB/s"

{ while true; do
    curl -s http://10.11.0.173:9100/metrics \
     | awk '/^node_disk_.+_bytes_total{device="sda"}/ {
         printf("%f0, $2/1024/1024);
       }'
    sleep 1
  done } | ttyplot -r -2 -u MB/s -t "10.11.0.173 sda writes"