ttyplot
a realtime plotting utility for terminal with data input from stdin
takes data from standard input / unix pipeline, most commonly some tool like ping, snmpget, netstat, ifconfig, sar, vmstat, etc. and plots in text mode on a terminal in real time, for example simple ping:
supports rate calculation for counters and up to two graphs on a single display using reverse video for second line, for example snmpget or ip link:
download
see releases tab
usage examples
cpu usage from vmstat using awk to pick the right column
vmstat -n 1 | gawk '{ print 100-int($(NF-2)); fflush(); }' | ttyplot
cpu usage from sar with title and fixed scale to 100%
sar 1 | gawk '{ print 100-int($NF); fflush(); }' | ttyplot -s 100 -t "cpu usage" -u "%"
memory usage from sar, using perl 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 and awk
{ while true; do uptime | gawk '{ gsub(/,/, ""); print $(NF-2) }'; sleep 1; done } | ttyplot -t "load average" -s load
ping plot with sed
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
{ 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\n", $1/1000) }' /sys/class/thermal/thermal_zone0/temp; sleep 1; done } | ttyplot -t "cpu temp" -u C
fan speed from lm-sensors using grep, tr and cut
{ 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 and jq
{ 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 plot for in/out or read/write
local network throughput for all interfaces combined from sar
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
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
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 "rate" by measureing time difference between samples
snmp network throughput for an interface using snmpget
{ 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 link and jq
{ 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\n", $2/1024/1024); }'; sleep 1; done } | ttyplot -r -2 -u MB/s -t "10.11.0.173 sda writes"
options
ttyplot [-2] [-r] [-c plotchar] [-e errchar] [-s softmax] [-m hardmax] [-t title] [-u unit]
-2 read two values and draw two plots, the second one is in reverse video
-r calculate counter rate and divide by measured sample interval
-c character to use for plot line, eg @ # % . etc
-e character to use for plot error line when value exceeds max (default: e)
-s softmax is an initial maximum value that can grow if data input has larger value
-m hardmax is a hard maximum value, if exceeded error line will be drawn (see -e)
-t title of the plot
-u unit displayed beside vertical bar
issues
stdio buffering
by default in unix stdio is buffered, you can work around it in various ways
ttyplot quits and erases screen when there is no more data
it's by design, you can work around by adding sleep or read, for example:
{ echo "1 2 3"; sleep 1000; } | ttyplot
when running interactively and non-numeric data is entered (eg some key) ttyplot hangs
press ctrl^j to re-set
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