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原帖由 barrcuda 于 2006-12-19 20:05 发表
sudo apt-get update && apt-get install checkinstall
这组命令在两个命令中间用了两个&, &&表示什么意思?高手请指教,谢谢
KSH(1) User commands KSH(1)
pipelines; |& is used to create co-processes (see Co-Pro-
cesses below); ; is used to separate commands; & is used
to create asynchronous pipelines; && and || are used to
specify conditional execution; ;; is used in case state-
ments; (( .. )) are used in arithmetic expressions; and
lastly, ( .. ) are used to create subshells.
条件执行,具体的可以参考相应 shell 的手册。Linux 上用得比较多的是 bash,你可以参考一下 bash(1) |
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