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Need a simple explanation of the inject method
...) of inject represents a starting place, it could be 0 or 1000.
Inside the pipes you have two place holders |x, y|. x = what ever number you had inside the .inject('x'), and the secound represents each iteration of your object.
[1, 2, 3, 4].inject(5) { |result, element| result + element } # => ...
Find all packages installed with easy_install/pip?
...pts, whereas pip list will generate unexpected errors when being used with pipes.
– Dale Anderson
Jan 18 '17 at 19:54
2
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I want to delete all bin and obj folders to force all projects to rebuild everything
...
You don't need the foreach - you should just be able to pipe gci straight into remove-item (i.e., gci -include bin,obj -recurse | remove-item -force -recurse)
– Chris J
Mar 16 '15 at 11:54
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CURL alternative in Python
...urthermore if you wrap this in a script and run it from a terminal you can pipe the response string to 'mjson.tool' to enable pretty printing.
>> basicAuth.py | python -mjson.tool
One last thing to note, urllib2 only supports GET & POST requests.
If you need to use other HTTP verbs lik...
MongoDB and “joins” [duplicate]
...on is no longer correct. The new $lookup operator added to the aggregation pipeline is essentially identical to a left outer join:
https://docs.mongodb.org/master/reference/operator/aggregation/lookup/#pipe._S_lookup
From the docs:
{
$lookup:
{
from: <collection to join>,
...
Retrieve filename from file descriptor in C
...rs refer to files, and for those you'll see some odd text strings, such as pipe:[1538488]. Since all of the real filenames will be absolute paths, you can determine which these are easily enough. Further, as others have noted, files can have multiple hardlinks pointing to them - this will only repor...
Copy a table from one database to another in Postgres
...
Extract the table and pipe it directly to the target database:
pg_dump -t table_to_copy source_db | psql target_db
Note: If the other database already has the table set up, you should use the -a flag to import data only, else you may see weird ...
Plotting two variables as lines using ggplot2 on the same graph
A very newbish question, but say I have data like this:
5 Answers
5
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Remove the last line from a file in Bash
...a note: it requires and operates on an real file, so it can not be used on pipes, command substitutions, redirections and such chains.
– MestreLion
Aug 30 '15 at 11:37
3
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How to get overall CPU usage (e.g. 57%) on Linux [closed]
...ommend above. Many people don't have that flexibility. cat /proc/stat then pipe is much easier than mpstat you recommend.
– vimdude
Mar 22 '13 at 13:13
12
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