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How to count items in JSON object using command line?
... can also use jq to track down the array within the returned json and then pipe that in to a second jq call to get its length. Suppose it was in a property called records, like {"records":[...]}.
$ curl https://my-source-of-json.com/list | jq -r '.records' | jq length
2
$
...
What is the Linux equivalent to DOS pause?
...
No, because tr would buffer its output as its a pipe, and non-US keyboards have keys that send characters outside the \1-\177 range. dd is the idiomatic way here.
– Stephane Chazelas
Jun 4 '14 at 20:51
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send/post xml file using curl command line
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The format file=@- is helpful if you want to pipe your file in.
– Steven Lu
Jul 24 '13 at 6:28
2
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How do I quickly rename a MySQL database (change schema name)?
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Using the piped version I get two "Enter password:" prompts like so: Enter password: Enter password: It seems to take one password, but not both. Am I missing a detail?
– Ryan
Jun 27 '14 at 7:5...
What does “var FOO = FOO || {}” (assign a variable or an empty object to that variable) mean in Java
...value of the AEROTWIST variable, or set it to an empty object.
The double pipe || is an OR statement, and the second part of the OR is only executed if the first part returns false.
Therefore, if AEROTWIST already has a value, it will be kept as that value, but if it hasn't been set before, then i...
Copying PostgreSQL database to another server
... need for intermediate files - you may use compressed SSH tunnel or simply pipe: pg_dump | bzip2 | ssh "bunzip2 | pg_restore"
– Kornel
Aug 6 '09 at 12:46
4
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Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
I'm reading some automated weather data from the web. The observations occur every 5 minutes and are compiled into monthly files for each weather station. Once I'm done parsing a file, the DataFrame looks something like this:
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Find all files with a filename beginning with a specified string?
...ng*' -type f
You could also perform some operations on results without pipe sign or xargs
Example:
Search for files and show their size in MB
find /path -iname 'yourstring*' -type f -exec du -sm {} \;
share
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What's the difference between Git Revert, Checkout and Reset?
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@BrunoSantos: Candlesticks, lead pipes, daggers, and rope can all be used to murder people, but that doesn't mean any of those things are particularly similar.
– Dan Moulding
Sep 29 '14 at 15:50
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How to enable CORS in AngularJs
... onGetUser(){
return this.http.get("http://localhost:3000/user").pipe(map(
(response:Response)=>{
const user =response.json();
return user;
}
))
}
But it gave the following error
This is the backend code written usi...