如何将参数传递给xargs EOF

Question

我尝试使用以下命令并行发送4个spark作业，并在开始新步骤之前等待所有这些作业完成。但是我注意到$cmd_trainSparkModelx命令在'xargs'中是空的。如何将它们传递到xargs？

eval $cmd_prepare_step

xargs -P 4 -I {} sh -c 'eval "$1"' - {} <<'EOF'
#eval "$cmd_trainSparkModel1"
#eval "$cmd_trainSparkModel2"
#eval "$cmd_trainSparkModel3"
#eval "$cmd_trainSparkModel4"
echo "$cmd_trainSparkModel1"
echo "$cmd_trainSparkModel2"
echo "$cmd_trainSparkModel3"
echo "$cmd_trainSparkModel4"
EOF

echo "finished training"
eval $cmd_postTraining_step

Answer 1

以下命令有效。但是仍然想看看如何使xargs起作用，因为它还可以控制同时运行多少个作业。

echo "$cmd_trainSparkModel1" &
p1=&!
echo "$cmd_trainSparkModel2" &
p2=&!
echo "$cmd_trainSparkModel3" &
p3=&!
echo "$cmd_trainSparkModel4" &
p4=&!
wait $p1 $p2 $p3 $p4