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Print current call stack from a method in Python code
...import pdb
Then in the code where you want to see what is happening
pdb.set_trace()
and you get dropped into a prompt
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PHP append one array to another (not array_push or +)
...b')
Will not work, because the + operator does not actually merge them. If they $a has the same keys as $b, it won't do anything.
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Best way to select random rows PostgreSQL
...E FUNCTION f_random_sample(_limit int = 1000, _gaps real = 1.03)
RETURNS SETOF big AS
$func$
DECLARE
_surplus int := _limit * _gaps;
_estimate int := ( -- get current estimate from system
SELECT c.reltuples * _gaps
FROM pg_class c
WHERE c.oid = 'big'::regclass...
Add file extension to files with bash
What is the good way to add file extension ".jpg" to extension-less files with bash?
10 Answers
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Have bash script answer interactive prompts [duplicate]
...tically handle prompts that would normally be presented to the user with default actions? Currently I am using a bash script to call an in-house tool that will display prompts to the user (prompting for Y/N) to complete actions, however the script I'm writing needs to be completely "hands-off", so ...
Use RSA private key to generate public key?
...a public - private key pair. The pair is stored in the generated mykey.pem file.
openssl rsa -in mykey.pem -pubout > mykey.pub
will extract the public key and print that out. Here is a link to a page that describes this better.
EDIT: Check the examples section here. To just output the public...
What's the difference between [ and [[ in Bash? [duplicate]
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FWIW, reference for the set of conditional expressions (like -f, -z etc) that can go inside [ or [[ is at Bash Reference Manual: Bash Conditional Expressions
– ShreevatsaR
May 2 '18 at 19:29
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Rank function in MySQL
...:= 0) part allows the variable initialization without requiring a separate SET command.
Test case:
CREATE TABLE person (id int, first_name varchar(20), age int, gender char(1));
INSERT INTO person VALUES (1, 'Bob', 25, 'M');
INSERT INTO person VALUES (2, 'Jane', 20, 'F');
INSERT INTO person VALUE...
Get Image size WITHOUT loading image into memory
...("jpeg", (0,0) + self.size, 0, (rawmode, ""))]
# self.__offset = self.fp.tell()
break
s = self.fp.read(1)
elif i == 0 or i == 65535:
# padded marker or junk; move on
s = "\xff"
else:
raise SyntaxError("no...
What is RSS and VSZ in Linux memory management
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RSS is the Resident Set Size and is used to show how much memory is allocated to that process and is in RAM. It does not include memory that is swapped out. It does include memory from shared libraries as long as the pages from those libraries...