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https://github.com/jaygooby/ttfb.sh
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Don't loop the gif
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Jay Caines-Gooby
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#!/bin/bash
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#
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# Shows time in seconds to first byte of a url or urls
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#
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# Based on a gist https://gist.github.com/sandeepraju/1f5fbdbdd89551ba7925abe2645f92b5
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# by https://github.com/sandeepraju
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#
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# Modified by jay@gooby.org, @jaygooby
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#
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# Usage: ttfb [options] url [url...]
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# -d debug
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# -l <log file> (infers -d) log response headers. Defaults to ./curl.log
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# -n <number> of times to test time to first byte
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# -v verbose output. Show request breakdown during -n calls
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#
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# Examples:
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#
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# ttfb https://example.com/example/url
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# .098974
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#
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# ttfb -n 5 https://example.com/
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# .....
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# fastest .099195 slowest .103138 median .099684
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#
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# ttfb -n 5 bbc.co.uk news.bbc.co.uk
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# .....
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# .....
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# bbc.co.uk fastest .045873 slowest .046870 median .045999
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# news.bbc.co.uk fastest .042286 slowest .060245 median .046035
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#
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# ttfb bbc.co.uk news.bbc.co.uk
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# bbc.co.uk .048378
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# news.bbc.co.uk .049303
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#
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# Implicitly follows redirects using curl's -L option.
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#
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# Log all response headers (default log file is ./curl.log) by calling with -d
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#
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# Override the default log file by specifying -l /some/file
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#
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# Get min, max and median values by specifying the number of times to call
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# the URL; use -n2 for 2 tests, -n5 for 5 and so on.
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#
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# If you specify more than one url and have specified -d or -l, the log file
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# will be prefixed with the URL being requested.
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#
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# If you specify -n and -d or -l, the response headers from the consecutive
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# requests will be concatenated in the log file.
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#
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# See https://blog.cloudflare.com/a-question-of-timing/
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# and https://curl.haxx.se/docs/manpage.html for an explanation
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# of how the curl variables relate to the various stages of
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# the transfer.
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#
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# To get a better approximation of devtool's TTFB, consider
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# the time without the connection overhead:
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# %{time_starttransfer} - %{time_appconnect}
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#
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# Uses a dirty eval to do the ttfb arithmetic. Depends
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# on bc and column commands.
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set -eu
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# check dependencies
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for dependency in curl bc column; do
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which -s $dependency || (echo "You need to have '$dependency' installed and in your \$PATH" >&2 && exit 1)
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done
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# Cribbed from https://stackoverflow.com/a/41762669/391826
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median() {
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arr=($(printf '%s\n' "${@}" | sort -n))
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nel=${#arr[@]}
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if (( $nel % 2 == 1 )); then # Odd number of elements
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val="${arr[ $(($nel/2)) ]}"
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else # Even number of elements
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(( j=nel/2 ))
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(( k=j-1 ))
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val=$(echo "scale=6;(${arr[j]}" + "${arr[k]})"/2|bc -l)
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fi
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echo $val
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}
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# defaults
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DEBUG=""
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LOG=""
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NUM_REQUESTS=0
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VERBOSE=0
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while getopts ":n:dl:v" OPTION
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do
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case $OPTION in
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d) DEBUG=1 ;;
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l) LOG="$OPTARG" ;;
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n) NUM_REQUESTS=$OPTARG ;;
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v) VERBOSE=1 ;;
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\?) echo -e "Usage: ttfb [options] url [url...]\n\t-d debug\n\t-l <log file> (infers -d) log response headers. Defaults to ./curl.log\n\t-n <number> of times to test time to first byte\n\t-v verbose output. Show response breakdown (DNS lookup, TLS handshake etc)" >&2
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exit 1
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;;
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esac
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done
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shift $((OPTIND - 1)) # shifts away every option argument,
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# leaving urls as $@
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if [ -z "$1" ]; then
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echo "You didn't specify any urls to fetch"
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exit 1
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else
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URLS="$@"
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fi
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# if we're given a custom log file, or log directory, implicitly set DEBUG=1
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[ -n "$LOG" ] && DEBUG=1
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# default the log file to curl.log in pwd or LOG_DIRECTORY if -o was specified
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LOG="${LOG:-curl.log}"
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# now work out if $LOG is relative or an absolute path
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# and then get the dirname
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[ "$LOG" != "${LOG#/}" ] && LOG_DIRECTORY=$(dirname "$LOG") || LOG_DIRECTORY=$(dirname "${PWD}/$LOG")
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if [ ! -d "$LOG_DIRECTORY" ]; then
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echo "Log directory $LOG_DIRECTORY doesn't exist" >&2
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exit 1;
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fi
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# then set the actual log filename
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LOG=$(basename "$LOG")
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DEBUG=${DEBUG:-0}
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options=()
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options+=(-o /dev/null)
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options+=(-s)
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options+=(-L)
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options+=(--http2)
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options+=(-H 'Cache-Control: no-cache')
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options+=(-w 'echo DNS lookup: %{time_namelookup} TLS handshake: %{time_appconnect} TTFB including connection: %{time_starttransfer} TTFB: $(echo %{time_starttransfer} - %{time_appconnect} | bc) Total time: %{time_total} \n')
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if [ $DEBUG -eq 1 ]; then
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options+=(-D "${LOG_DIRECTORY}/${LOG}")
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fi
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for URL in $URLS; do
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# if we're checking more than one url
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# output the url on the results line
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if [ ${#@} -gt 1 ]; then
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SHOW_URL="${URL}|"
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if [[ $VERBOSE -eq 1 && -n "$NUM_REQUESTS" && "$NUM_REQUESTS" -gt 1 ]]; then
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echo $URL >&2
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fi
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else
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SHOW_URL=""
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fi
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# if multiple requests have been specified, then show min, max & median values
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if [[ -n "$NUM_REQUESTS" && "$NUM_REQUESTS" -gt 1 ]]; then
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ttfbs=()
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for i in $(seq $NUM_REQUESTS); do
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# if we're checking more than one url, and debug is set, then log
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# the headers to a per-url file, but also for each request
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if [[ ${#@} -gt 1 && $DEBUG -eq 1 ]]; then
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LOGFILE="${URL//[^[:alnum:]]/_}"
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options+=(-D "${LOG_DIRECTORY}/${LOGFILE}-${LOG}_${i}")
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elif [ $DEBUG -eq 1 ]; then
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# we only have the one URL, but we still are requesting multiple
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# ttfb calls, so log the headers
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options+=(-D "${LOG_DIRECTORY}/${LOG}_${i}")
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fi
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request=$(eval $(curl "${options[@]}" "$URL"))
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ttfbs+=($(echo $request | grep -oE "TTFB: .{0,7}" | cut -d' ' -f2 | sort -n));
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if [ $VERBOSE -eq 1 ]; then
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echo "$request" >&2
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else
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printf "." >&2
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fi
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done
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# tidy up - combine multiple request logs for the same url into a single file
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if [[ ${#@} -gt 1 && $DEBUG -eq 1 ]]; then
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cat "${LOG_DIRECTORY}/${LOGFILE}-${LOG}_"* > "${LOG_DIRECTORY}/${LOGFILE}-${LOG}"
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rm "${LOG_DIRECTORY}/${LOGFILE}-${LOG}_"*
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elif [ $DEBUG -eq 1 ]; then
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cat "${LOG_DIRECTORY}/${LOG}_"* > "${LOG_DIRECTORY}/${LOG}"
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rm "${LOG_DIRECTORY}/${LOG}_"*
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fi
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printf "\n" >&2
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# sort the times
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ttfbs=( $( printf "%s\n" "${ttfbs[@]}" | sort -n ) )
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# show quickest, slowest and median fftb
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printf "${SHOW_URL}\e[32mfastest \e[39m${ttfbs[0]} \e[91mslowest \e[39m${ttfbs[${#ttfbs[*]}-1]} \e[95mmedian \e[39m$(median ${ttfbs[*]})\e[39m\n";
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else
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if [ $VERBOSE -eq 1 ]; then
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echo -e $SHOW_URL $(eval $(curl "${options[@]}" "$URL"))
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else
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echo -e $SHOW_URL $(eval $(curl "${options[@]}" "$URL") | grep -oE "TTFB: .{0,7}" | cut -d' ' -f2)
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fi
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fi
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done | column -s'|' -t
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