在"heredoc"内部循环在shell脚本中 [英] Loop inside "heredoc" in shell scripting

问题描述

我需要在带有参数化值的交互式程序/实用程序中执行一系列命令.有没有一种方法可以在heredoc中循环?如下所示..不确定eval是否对您有帮助.下面的示例似乎不起作用，因为交互似乎无法识别系统命令.

I need to execute series of commands inside an interactive program/utility with parameterized values. Is there a way to loop inside heredoc ? Like below .. Not sure if eval can be of any help here. Below example doesn't seem to work as the interactive doesn't seem to recognize system commands.

#!/bin/sh
list="OBJECT1 OBJECT2 OBJECT3"
utilityExecutable << EOF
for i in $list ; do
utilityCommand $i
done
EOF

推荐答案

不是将此处文档传递给utilityExecutable， 等效的是将所需的文本通过管道传递给它.您可以在for循环中使用echo语句创建所需的文本，并将整个循环输出通过管道传递到utilityExecutable:

Instead of passing a here-document to utilityExecutable, the equivalent is to pipe the required text to it. You can create the desired text using echo statements in a for-loop, and pipe the entire loop output to utilityExecutable:

#!/bin/sh

list="OBJECT1 OBJECT2 OBJECT3"

for i in $list; do
    echo "utilityCommand $i"
done | utilityExecutable

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