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jq: Accepts a file as last parameter

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Examples look simpler with file as last parameter than with using `cat`,
also they explicitly show that you must use `.` as the default
all-matching rule.

Keep the last two examples with piping, and change their descriptions
accordingly.
This commit is contained in:
Eric Nielsen 2018-04-13 13:04:03 -05:00 • committed by Starbeamrainbowlabs
parent d44081fdd3
commit a2d755a504
1 changed files with 8 additions and 8 deletions
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16
pages/common/jq.md
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@ -4,24 +4,24 @@
- Output a JSON file, in pretty-print format: - Output a JSON file, in pretty-print format:
`cat {{file}} | jq` `jq . {{file.json}}`
- Output all elements from arrays (or all key-value pairs from objects) in a JSON file: - Output all elements from arrays (or all key-value pairs from objects) in a JSON file:
`cat {{file}} | jq .[]` `jq .[] {{file.json}}`
- Read JSON objects from a file into an array, and output it (inverse of `jq .[]`): - Read JSON objects from a file into an array, and output it (inverse of `jq .[]`):
`cat {{file}} | jq --slurp` `jq --slurp . {{file.json}}`
- Output the first element in a JSON file: - Output the first element in a JSON file:
`cat {{file}} | jq .[0]` `jq .[0] {{file.json}}`
- Output the value of a given key of the first element in a JSON file: - Output the value of a given key of the first element in a JSON from stdin:
`cat {{file}} | jq .[0].{{key_name}}` `cat {{file.json}} | jq .[0].{{key_name}}`
- Output the value of a given key of each element in a JSON file: - Output the value of a given key of each element in a JSON from stdin:
`cat {{file}} | jq 'map(.{{key_name}})'` `cat {{file.json}} | jq 'map(.{{key_name}})'`