TTYPLOT(1)

NAME
ttyplot - realtime terminal plotting utility

SYNOPSIS
ttyplot [options]

DESCRIPTION
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.

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("%.1f, $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

  Network/disk throughput examples
ttyplot supports two-line plots for in/out or read/write.

Local network throughput for all interfaces combined from sar(1):

    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"

SNMP network throughput for an interface using ‘ttg’:

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

SNMP network throughput for an interface using snmpdelta(1):

    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

Disk throughput from iostat(1):

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

  Rate calculator for counters
ttyplot also supports counter style metrics, calculating a rate by measuring time difference between samples.

SNMP network throughput for an interface using snmpget(1):

    { 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"

Local interface throughput using ip(8) and jq(1):

    { 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"

Prometheus node exporter disk throughput for /dev/sda:

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

AUTHORS
ttyplot as written by Antoni Sawicki <tenox@google.com>.

Its readme was converted into this manual page by Sijmen J. Mulder <ik@sjmulder.nl>.

BUGS
By default in standard in- and output are is buffered. This can be worked around in various ways: http://www.perkin.org.uk/posts/how-to-fix-stdio-buffering.html.

ttyplot quits and erases the screen when there is no more data. This is by design and can be worked around by adding sleep(1) or read(1), for example:

    { echo 1 2 3; sleep 1000; } | ttyplot

When running interactively and non-numeric data is entered (e.g. some key) ttyplot hangs. Press ‘Ctrl^J’ to reset.