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FreeBSD保证shell程序只有单一instance运行

2007-03-12 16:23:34| 分类： shell | 标签： |举报 |字号大中小订阅

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FreeBSD保证 shell 程序只有单一 instance 运行？　

使用lockf 命令

man lockf: lockf -- execute a command while holding a file lock

例：如果要执行　/home/livedoorcn/run.sh ,

/usr/bin/lockf -t 0 /tmp/run.lock /home/livedoorcn/run.sh

例子的含义是：
1、/usr/bin/lockf -t 0 /tmp/run.lock /home/livedoorcn/run.sh　开始运行时首先检查 /tmp/ 下是否有run.lock 文件，是，不执行/home/livedoorcn/run.sh，退出，否，生成/tmp/run.lock 文件，执行/home/livedoorcn/run.sh

2、当/home/livedoorcn/run.sh 执行完成后，lockf 删除/tmp/run.lock

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