bash getopts 多个参数或默认值
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bash getopts multiple arguments or default value
提问by Greg
So I have a question about get opts in bash. I want to get the value of the arguments if they are present but if they are not present to use a default value. So the script should take a directory and an integer but if they aren't specified then $PWD and 3 should be default values. Here is what
所以我有一个关于 get opts in bash 的问题。如果它们存在，我想获取参数的值，但如果它们不存在，则使用默认值。所以脚本应该采用一个目录和一个整数，但如果没有指定它们，那么 $PWD 和 3 应该是默认值。这是什么
while getopts "hd:l:" opt; do
case $opt in
d ) directory=$OPTARG;;
l ) depth=$OPTARG;;
h ) usage
exit 0;;
\? ) usage
exit 1;;
esac
回答by anubhava
You can just provide default value before whileloop:
您可以在while循环前提供默认值：
directory=mydir
depth=123
while getopts "hd:l:" opt; do
case $opt in
d ) directory=$OPTARG;;
l ) depth=$OPTARG;;
h ) usage
exit 0;;
*) usage
exit 1;;
esac
done
echo "<$directory> <$depth>"
