I am trying to print 2 outputs from different scripts that run in the background in the same time with a third one.
My third script looks like:
#!/bin/bash
./script1 &
./script2 &
The output of every script is a simple progress bar:
scriptN: [##....................] (10%) (10/100)
I would like the output to be something like that:
script1: [##....................] (10%) (10/100)
script2: [##....................] (10%) (10/100)
I don't think this is possible, at least not without enormous effort. Dynamic progress bars in the terminal rely on control characters to change the position of the cursor and redraw characters on the screen. Running two programs simultaneously that each attempt to control what's being drawn will result in conflicts between the two programs.
It may be possible to write a script that emulates a terminal and composes each output stream independently and then recomposes them together into a single stream, but I've not heard of anybody attempting such a thing before.
This is kinda hacky and will spam your screen so scrolling back won't be easy but should work.
#!/bin/bash
output1=$(mktemp /tmp/tmpout.XXXXXX)
output2=$(mktemp /tmp/tmpout.XXXXXX)
./script1 &> $output1 &
pid1=$!
./script2 &> $output2 &
pid2=$!
while [ -d "/proc/$pid1" ] || [ -d "/proc/$pid2" ]
do
clear
tail -n 1 $output1
tail -n 1 $output2
sleep 1
done
rm -f $output1 $output2
#!/bin/bash output1=$(mktemp /tmp/tmpout.XXXXXX) output2=$(mktemp /tmp/tmpout.XXXXXX) ./script1 &> $output1 & pid1=$! ./script2 &> $output2 & pid2=$! while [ -d "/proc/$pid1" ] || [ -d "/proc/$pid2" ] do out1="$(cat $output1)" out2="$(cat $output2)" echo -ne "\r$out1\n$out2" sleep 1 done rm -f $output1 $output2 my output is: script1: [##....................] (10%) (10/100) script1: [###..................] (20%) (20/100) script1: [####..................] (30%) (30/100) script2: [##....................] (10%) (10/100) - keeps going help?
echo -ne that will stay at the same line and update itself
worked after a small research and the help of @ZacharyBrady
#!/bin/bash
output1=$(mktemp /tmp/tmpout.XXXXXX)
output2=$(mktemp /tmp/tmpout.XXXXXX)
./script1 &> $output1 &
pid1=$!
./script2 &> $output2 &
pid2=$!
while [ -d "/proc/$pid1" ] || [ -d "/proc/$pid2" ]
do
out1="$(tail -n 1 $output1)"
out2="$(tail -n 1 $output2)"
echo $out1
echo $out2
tput cuu1 # move cursor up by one line
tput el # clear the line
tput cuu1
tput el
done
rm -f $output1 $output2