Bash escaping and syntax -

Bash escaping and syntax -

i have little bash file intend utilize determine current ping vs average ping.

#!/bin/bash output=($(ping -qc 1 google.com | tail -n 1)) echo "`cut -d/ -f1 <<< "${output[3]}"`-20" | bc

this outputs ping - 20 ms, number want. however, want prepend + if number positive , append "ms".

this brings me overarching problem: bash syntax regarding escaping , such heavy "indenting" kind of flaky.

while i'll satisfied reply of how wanted, i'd link to, or explanation of how bash syntax works dealing sort of thing.

output=($(ping -qc 1 google.com | tail -n 1)) echo "${output[3]}" | awk -f/ '{printf "%+fms\n", $1-20}'

the + modifier in printf tells print sign, whether it's positive or negative.

and since we're using awk, there's no need utilize cut or bc field or arithmetic.

bash