bash 脚本的正确缩进是什么？
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What is the proper indentation for bash scripts?
提问by sixtyfootersdude
What is the proper indentation for a bash script? As a java/c++ monkey I religiously indent my code. But it seems you are not allowed to indent this code:
bash 脚本的正确缩进是什么？作为一个 java/c++ 猴子，我虔诚地缩进了我的代码。但您似乎不允许缩进此代码：
#! /bin/bash
if [ $# = 0 ]
then
# there was no arguments => just do to standard output.
echo "there are no parameters"
else
cat << EOF
==========================================================
==========================================================
==========================================================
==========================================================
DESCRIPTION:
----------------------------------------------------------
EOF
fi
When indented it does not recognize the EOF and if you just unindented the EOF (confusing) it prints indented.
缩进时，它无法识别 EOF，如果您只是取消缩进 EOF（令人困惑），它会打印缩进。
Q:What is the proper indenting for bash scripts?
问：bash 脚本的正确缩进是什么？
回答by Dan Andreatta
With bash (3.2 at least) and ksh (do not know about others) you can indent the here-documents using <<-, and the leading tabs will be stripped (not spaces, only tabs), e.g.
使用 bash（至少 3.2）和 ksh（不知道其他人），您可以使用缩进此处的文档<<-，并且将去除前导制表符（不是空格，只有制表符），例如
if [...]; then
cat <<-EOF
some text
EOF
fi
回答by ghostdog74
yes you can "indent", by using <<-(see bash man page on here documents)
是的，您可以使用“缩进” <<-（请参阅此处文档中的 bash 手册页）
if [ $# = 0 ]
then
# there was no arguments => just do to standard output.
echo "there are no parameters"
else
cat <<-EOF
==========================================================
==========================================================
==========================================================
==========================================================
DESCRIPTION:
----------------------------------------------------------
EOF
fi
回答by mouviciel
This is not a bash indenting problem, this is a here-file problem. The label that you specify after <<, i.e., EOF, must appear alone in a line, without leading or trailing whitespaces.
这不是 bash 缩进问题，这是一个 here-file 问题。您在 之后指定的标签<<，即 ，EOF必须单独出现在一行中，不能有前导或尾随空格。
For the here-file itself, it is used as typed, indentation included.
对于 here-file 本身，它用作类型，包括缩进。
回答by Steve Emmerson
Mouviciel is correct.
Mouviciel 是正确的。
You can put the here-file text in a separate file if you want to preserve indentation. You would then have to handle the substitution yourself, however.
如果要保留缩进，可以将此处文件文本放在单独的文件中。但是，您随后必须自己处理替换。
