82 lines
2.2 KiB
Plaintext
82 lines
2.2 KiB
Plaintext
[[cat]]
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= cat APIs
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[partintro]
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--
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["float",id="intro"]
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== Introduction
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JSON is great... for computers. Even if it's pretty-printed, trying
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to find relationships in the data is tedious. Human eyes, especially
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when looking at an ssh terminal, need compact and aligned text. The
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cat API aims to meet this need.
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All the cat commands accept a query string parameter `h` to see all
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the headers and info they provide, and the `/_cat?h` command lists all
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the available commands.
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[float]
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[[common-parameters]]
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== Common parameters
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[float]
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[[verbose]]
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=== Verbose
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Each of the commands accepts a query string parameter `v` to turn on
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verbose output.
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[source,shell]
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--------------------------------------------------
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% curl 'localhost:9200/_cat/master?v'
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id ip node
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EGtKWZlWQYWDmX29fUnp3Q 127.0.0.1 Grey, Sara
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--------------------------------------------------
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[float]
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[[numeric-formats]]
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=== Numeric formats
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Many commands provide a few types of numeric output, either a byte
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value or a time value. By default, these types are human-formatted,
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for example, `3.5mb` instead of `3763212`. The human values are not
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sortable numerically, so in order to operate on these values where
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order is important, you can change it.
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Say you want to find the largest index in your cluster (storage used
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by all the shards, not number of documents). The `/_cat/indices` API
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is ideal. We only need to tweak two things. First, we want to turn
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off human mode. We'll use a byte-level resolution. Then we'll pipe
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our output into `sort` using the appropriate column, which in this
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case is the eight one.
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[source,shell]
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--------------------------------------------------
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% curl '192.168.56.10:9200/_cat/indices?bytes=b' | sort -rnk8
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green wiki2 3 0 10000 0 105274918 105274918
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green wiki1 3 0 10000 413 103776272 103776272
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green foo 1 0 227 0 2065131 2065131
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--------------------------------------------------
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--
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include::cat/allocation.asciidoc[]
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include::cat/count.asciidoc[]
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include::cat/health.asciidoc[]
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include::cat/indices.asciidoc[]
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include::cat/master.asciidoc[]
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include::cat/nodes.asciidoc[]
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include::cat/pending_tasks.asciidoc[]
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include::cat/recovery.asciidoc[]
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include::cat/shards.asciidoc[]
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