Проблема с обновлением lilypond в Debian «buster / sid»

Для каждой команды вы можете коснуться файла и проверить этот файл. Вот простой пример:

#!/usr/local/bin/bash

# Flag to knkow when completed
finished=0;

# The commands t run
declare -a commands=('cmd1' 'cmd2' 'cmd3' 'cmd4');

# Fork all commands
for cmd in "${commands[@]}"; do
        ./$cmd &
done

# Loop to wait for all processes to finish
loop=0;
while [ $finished -eq 0 ]; do
        # Just for visual effect
        loop=$((loop+1));
        echo "Loop $loop";
        sleep 1;

        files=0;
        for cmd in "${commands[@]}"; do
                # Each program shoudl touch a file so that we
                # can know it has completed successfully
                if [ -e ".$cmd" ]; then
                        echo "Process $cmd completed";
                        files=$((files+1));
                else
                        # No need to continue if anything is not done
                        # Error checking here like a TTL value or ps -ef | grep pid etc
                        echo "Waiting for process $cmd";
                        break;
                fi;
        done

        # if we have as many files as executed commands
        if [ "$files" -eq ${#commands[@]} ]; then
                finished=1;
        fi
done;

echo 'All jobs completed successfully';
# Clean up after yourself
for cmd in "${commands[@]}"; do
        rm -f ".$cmd";
done;

Тогда для проверки каждой команды cmd1, cmd2 ... cmdN может быть что-то вроде:

#!/usr/local/bin/bash
num=1;

echo "Enter cmd$num";
sleep 1; # use different sleep values to simulate execution
touch ".cmd$num"
echo "Exit cmd$num";