[英]Merging JSON files using a bash script
I am very new to bash scripting. 我是新手来编写脚本。 I attempted to write a script that merges several json files. 我试图编写一个合并多个json文件的脚本。 For example: 例如:
File 1: 档案1:
{
"file1": {
"foo": "bar"
}
}
File 2: 文件2:
{
"file1": {
"lorem": "ipsum"
}
}
Merged File: 合并文件:
{
"file1": {
"foo": "bar"
},
"file2": {
"lorem": "ipsum"
}
}
This is what I came up with: 这就是我想出的:
awk 'BEGIN{print "{"} FNR > 1 && last_file == FILENAME {print line} FNR == 1 {line = ""} FNR==1 && FNR != NR {printf ","} FNR > 1 {line = $0} {last_file = FILENAME} END{print "}"}' json_files/* > json_files/all_merged.json
It works but I feel there is a better way of doing this. 它有效,但我觉得有更好的方法。 Any ideas? 有任何想法吗?
Handling JSON with awk is not a terribly good idea. 使用awk处理JSON并不是一个非常好的主意。 Arbitrary changes in meaningless whitespace will break your code. 无意义的空白中的任意更改将破坏您的代码。 Instead, use jq
; 相反,使用jq
; it is made for this sort of thing. 这是为了这种事情。 To combine two objects, use the *
operator, ie, for two files: 要组合两个对象,请使用*
运算符,即两个文件:
jq -s '.[0] * .[1]' file1.json file2.json
And for arbitrarily many files, use reduce
to apply it sequentially to all: 对于任意多个文件,使用reduce
将其顺序应用于所有文件:
jq -s 'reduce .[] as $item ({}; . * $item)' json_files/*
The -s
switch makes jq
read the contents of the JSON files into a large array before handling them. -s
开关使jq
在处理之前将JSON文件的内容读入大型数组。
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