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This article mainly explains "how to use the Linux jq command". Friends who are interested might as well take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn how to use the Linux jq command.

Linux commonly used commands jq commands a flexible lightweight command line JSON processor.

Jq: a flexible, lightweight command line JSON processor

Add that jq is a lightweight and flexible command line JSON processor developed by stedolan. Please refer to the jq project home page for source code.

Jq is used to process JSON input, apply a given filter to its JSON text input, and generate the result of the filter as JSON on standard output.

The simplest filter is., which copies the input of jq to its output unmodified (except for formatting).

Note that jq currently only supports 64-bit double-precision floating point numbers (IEEE754).

Install # Debian system, such as Ubuntu sudo apt-get install jq # RedHat system, such as CentOS yum install jq syntax jq [options] [file...] Jq [options]-- args [strings...] Jq [options]-- jsonargs [JSON_TEXTS...] Option-c compact rather than beautiful output;-n uses `null` as a single input value;-e exits status code according to output settings;-s reads (absorbs) all inputs into the array Apply a filter;-r outputs raw strings instead of JSON text;-R reads raw strings instead of JSON text;-C shades JSON;-M monochrome (do not color JSON);-S sorts the keys of objects on the output -- tab indents using tabs;-- arg a v sets the variable $a to value;-- argjson a v sets the variable $a to JSON value;-- slurpfile a f sets the variable $a to the JSON text array read from;-- rawfile a f sets the variable $a to the string containing the contents;-- args the rest of the parameters are string parameters, not files. -- jsonargs the rest of the parameters are JSON parameters, not files;-- terminating parameter processing; example.: output in a beautiful way

$echo'{"foo": {"bar": {"baz": 123}'| jq'.'{"foo": {"bar": {"baz": 123}} .foo, .foo.bar, .foo?: get the value of a key

$echo'{"foo": 42, "bar": "less interesting data"}'| jq '.foo' 42. [],. []?,. [2],. [10:15]: array operation

$echo'[{"name": "JSON", "good": true}, {"name": "XML", "good": false}]'| jq'. [1]'{"name": "XML", "good": false} [], {}: construct an array / object

$echo'{"user": "stedolan", "titles": ["JQ Primer", "More JQ"]}'| jq'{user, title: .titles []}'{"user": "stedolan", "title": "JQ Primer"} {"user": "stedolan", "title": "More JQ"} length: calculate the length of a value

$echo'[[1jq 2], "string", {"a": 2}, null]'| jq'. [] | length' 261 0keys: fetches the key in the array

$echo'{"abc": 1, "abcd": 2, "Foo": 3}'| jq 'keys' ["Foo", "abc", "abcd"],: use multiple filters

$echo'{"foo": 42, "bar": "something else", "baz": true}'| jq '.foo, .bar' 42 "something else" |: use the output of one filter as the input of the next filter through the pipeline

$echo'[{"name": "JSON", "good": true}, {"name": "XML", "good": false}]'| jq'. [] | .name'"JSON"XML" select (foo): if foo returns true, the input remains unchanged

$echo'[1 map 5 map 7]'| jq 'map (select (. > = 2))' [5 3, 7] filter (foo): each input calls the filter

$echo'[1pr 2je 3]'| jq 'map (. + 1)' [2pr 3,4] if-then-else-end: conditional judgment

$echo'2' | jq'if. = = 0 then "zero" elif. = = 1 then "one" else "many" end' "many"\ (foo): insert a value into a string and perform an operation

$echo '42' | jq' "The input was\ (.), which is one less than\ (. + 1)"The input was 42, which is one less than 43". Now that you have a better understanding of how to use the Linux jq command, you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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