linux shell 多个命令一起执行的几种方法
在linux shell 中多个命令一起执行的几种方法
- 每个命令之间用分号（；）隔开
各个命令的执行结果，不会影响其他命令的执行。每个命令都会执行，但不保证每个命令都会执行成功。
2. 每个命令之间使用 && 隔开
前面的命令执行成功，才会执行后边的命令。这样保证所有命令执行完之后，执行过程都是成功的。
3. 每个命令之间使用 || 或者 ｜ 隔开
|| 是或的意思，只有前面的命令执行失败后才去执行下一条命令，直到执行成功
｜ 是管道，将一个命令的输出导向另一个命令的输入。
例如：显示查找内容并且显示头信息：ps -ef | head -1 && ps -ef | grep cmlb | grep -v grep
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