[Shell 基础] shell 判断多重启动

1. 采用 lock 文件
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#!/bin/sh
if ln -s /tmp/checkfile.pid; then
  echo "startup..."
  sleep 10
else
  echo "is running..."
  exit
fi
rm -f checkfile.pid
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2. 采用 ps 命令

2-1. 运行 shell 脚本
$ sh check.sh

2-2. 判断 check.sh 是否在运行
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#!/bin/sh
res=`ps aux | grep "check.sh" | grep -v grep | awk '{print $2}'`
if [ -z "$res" ] ; then
  echo "startup..."
else
  echo "is running..."
fi
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