英文:
Shell one-liner to run a command if it exists, or fall back to a second one if it doesn't
问题
我有两个需要以不同方式运行的应用程序，但我习惯于使用我的bash别名来启动它们，所以我想将它们合并。
一个命令是./bin/dev，另一个是bundle exec rails s。
所以我尝试过这样做，但那不是我想要的。
./bin/dev || bundle exec rails s
这个命令会在该文件夹中找到bin/dev时启动它，但当我取消(ctrl+C)时，它会“继续”执行链并运行第二个命令。
我只希望第一个命令失败时才运行第二个命令。这可能吗（一行的bash别名）？
英文:
I have two apps who need to be ran in different ways, but I'm so used to my bash alias to start them, so I would like to combine it
One command is ./bin/dev, and another is bundle exec rails s
So I tried to do this, but that doesn't do what I want.
./bin/dev || bundle exec rails s
This one would start bin/dev if available in that folder, but when I cancel (ctrl+C), it would "continue" the chain and run the 2nd command.
I only want the 2nd command to run if the first one fails. Is this possible (one-liner bash alias)
答案1
得分: 2
Use if/else 以便仅在存在./bin/dev而不是其执行时有条件地进行操作
if [ -x ./bin/dev ]; then ./bin/dev; else bundle exec rails s; fi
英文:
Use if/else so that you only conditionalize on the existence of ./bin/dev, not its execution
if [ -x ./bin/dev ]; then ./bin/dev; else bundle exec rails s; fi
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