up.sh

#!/bin/bash
#https://blog.csdn.net/mydriverc2/article/details/79011438

set -x

cmd="$@"



r=$(ps aux|grep "${cmd}" | grep -v  "$0"|grep -v 'grep')
    

if [ "x${r}" == 'x' ]; then
    echo "exec:[${cmd} &]"
    $($@) &
    sleep 5
    echo "$?"
    
    r=$(ps aux|grep "${cmd}" | grep -v  "$0"|grep -v 'grep')

    if [ "x${r}" == 'x' ]; then
	wait $!	
	ret_code=$?
	echo "${ret_code}, $!"
	exit ${ret_code}
    fi

fi

success

$ ./up.sh ./yii hello/index
+ cmd='./yii hello/index'
++ grep './yii hello/index'
++ ps aux
++ grep -v ./up.sh
++ grep -v grep
+ r=
+ '[' x == x ']'
+ echo 'exec:[./yii hello/index &]'
exec:[./yii hello/index &]
+ sleep 5
++ ./yii hello/index
+ echo 0
0
++ ps aux
++ grep './yii hello/index'
++ grep -v ./up.sh
++ grep -v grep
+ r='soul11201         58554   0.0  0.2  4359904  18452 s009  S+    4:18PM   0:00.12 php ./yii hello/index'
+ '[' 'soul11201         58554   0.0  0.2  4359904  18452 s009  S+    4:18PM   0:00.12 php ./yii hello/index' == x ']'

$ echo $?
0

failed

$ ./up.sh ./yii hello/index
+ cmd='./yii hello/index'
++ grep './yii hello/index'
++ ps aux
++ grep -v ./up.sh
++ grep -v grep
+ r=
+ '[' x == x ']'
+ echo 'exec:[./yii hello/index &]'
exec:[./yii hello/index &]
+ sleep 3
++ ./yii hello/index
PHP Notice 'yii\base\ErrorException' with message 'Undefined index: kafka-config'

in ./commands/HelloController.php:156

Stack trace:
#0 ./commands/HelloController.php(156): yii\base\ErrorHandler->handleError(8, 'Undefined index...', './commands/HelloC...', 156, Array)
#1 [internal function]: app\commands\HelloController->actionIndex()
#2 ./vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array(Array, Array)
#3 ./vendor/yiisoft/yii2/base/Controller.php(157): yii\base\InlineAction->runWithParams(Array)
#4 ./vendor/yiisoft/yii2/console/Controller.php(148): yii\base\Controller->runAction('index', Array)
#5 ./vendor/yiisoft/yii2/base/Module.php(528): yii\console\Controller->runAction('index', Array)
#6 ./vendor/yiisoft/yii2/console/Application.php(180): yii\base\Module->runAction('hello/i...', Array)
#7 ./vendor/yiisoft/yii2/console/Application.php(147): yii\console\Application->runAction('hello/i...', Array)
#8 ./vendor/yiisoft/yii2/base/Application.php(386): yii\console\Application->handleRequest(Object(yii\console\Request))
#9 ./yii(20): yii\base\Application->run()
#10 {main}
+ echo 0
0
++ ps aux
++ grep './yii hello/index'
++ grep -v ./up.sh
++ grep -v grep
+ r=
+ '[' x == x ']'
+ wait 58514
+ ret_code=1
+ echo '1, 58514'
1, 58514
+ exit 1

$ echo $?
1

背景&目标：

shell 中的 & 会掩盖掉 原本脚本运行的状态码。

如果 dcron 拉起来失败，这段代码可以传递出来原本脚本的进程的退出错误码。

如果后台运行进程没有拉起来，也能感知到失败了，继续复用 dcron 的邮件、短信