如何有条件地将标志添加到shell脚本? [英] How to conditionally add flags to shell scripts?

问题描述

我想在bash脚本中运行带有或不带有 -v 标志的命令，具体取决于是否定义了环境变量$ VERBOSE.像这样:

I want to run a command inside my bash script with or without a -v flag depending on if the environment variable $VERBOSE is defined. Something like this:

#!/bin/bash

/usr/local/bin/mongo-connector \
  -m $MONGO_HOST \
  -t $NEO_URI \
  [if $VERBOSE then -v ] \
  -stdout

推荐答案

出于可读性考虑，请考虑使用数组存储参数.

For readability, consider using an array to store the arguments.

args=(
  -m "$MONGO_HOST"
  -t "$NEO_URI"
  -stdout
)
if [[ -v VERBOSE ]]; then
    args+=(-v)
fi
/usr/local/bin/mongo-connector "${args[@]}"

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