wait コマンドの実験結果

wait.sh

#!/bin/bash

sleep 2 && echo "bar" &
sleep 1 && echo "foo" &

wait

echo "hogehoge"

wait.sh.md

$ bash -x wait.sh
+ sleep 2
+ wait
+ sleep 1
+ echo foo
foo
+ echo bar
bar
+ echo hogehoge
hogehoge

wait_pid.sh

#!/bin/bash
sleep 5 && awk 'END { exit 5 }' &
pid1=$!
sleep 1 && awk 'END { exit 1 }' &
pid2=$!
sleep 3 && awk 'END { exit 3 }' &
pid3=$!

wait $pid1
echo $?
wait $pid2
echo $?
wait $pid3
echo $?

wait_pid.sh.md

$ bash -x wait_pid.sh
+ pid1=9559
+ sleep 5
+ pid2=9560
+ sleep 1
+ pid3=9562
+ wait 9559
+ sleep 3
+ awk 'END { exit 1 }'
+ awk 'END { exit 3 }'
+ awk 'END { exit 5 }'
+ echo 5
5
+ wait 9560
+ echo 1
1
+ wait 9562
+ echo 3
3