我如何使用IF语句时拆分为多行的bash命令？ [英] How can I split a Bash command over multiple lines when using an IF statement?

问题描述

如何能比我在猛砸，当命令是如果语句的一部分？

How can I split a command over multiple lines in Bash, when the command is part of an if statement?

虽然这个作品：

if ! fab --fabfile=.deploy/fabfile.py --forward-agent --disable-known-hosts deploy:$target; then                                                                                 
  rc=1                                                                                                                                                                           
fi   

这是行不通的：

# does not work:                                                                                                                                                             
if ! fab --fabfile=.deploy/fabfile.py \                                                                                                                                         
  --forward-agent \                                                                                                                                                             
  --disable-known-hosts deploy:$target; then   
  rc=1                                                                                                                                                                           
fi 

而不是整个命令执行的，我得到：

Instead of the whole command executing, I get:

./script.sh: line 73: --forward-agent: command not found

更重要的是，什么是从我的Bash的理解缺失，这将有助于我了解这一点，类似问题在未来？

More importantly, what is missing from my understanding of Bash that will help me understand this and similar issues in the future?

推荐答案

您确定你没有这些反斜杠后的任何空白？你的榜样正常工作对我来说：

You sure you don't have any whitespace after those backslashes? Your example works fine for me:

$ cat test.sh
if ! fab --fabfile=.deploy/fabfile.py \
   --forward-agent \
   --disable-known-hosts deploy:$target; then
     echo failed
else
     echo succeeded
fi

$ alias fab=true
$ . ./test.sh
succeeded
$ alias fab=false
$ . ./test.sh
failed

这篇关于我如何使用IF语句时拆分为多行的bash命令？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！