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Check Whether a User Exists
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Why don't you simply use
grep -c '^username:' /etc/passwd
It will return 1 (since a user has max. 1 entry) if the user exists and 0 if it doesn't.
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Converting int to bytes in Python 3
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From python 3.2 you can do
>>> (1024).to_bytes(2, byteorder='big')
b'\x04\x00'
https://docs.python.org/3/library/stdtypes.html#int.to_bytes
def int_to_bytes(x: int) -> bytes:
return x.to_bytes((x.bit_length() + 7) // 8, 'big')
def int_from_bytes(xbytes: bytes) -> i...
SQL : BETWEEN vs =
...tcha is that lower and upper bounds do need to be specified in the correct order (i.e. BETWEEN low AND high).
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Possible to make labels appear when hovering over a point in matplotlib?
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This does just what I need, thank you! As a bonus, in order to get it implemented, I rewrote my program so that instead of creating two separate scatter plots in different colors on the same figure to represent two sets of data, I copied the example's method for assigning color ...
Is this object-lifetime-extending-closure a C# compiler bug?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?
... a keyword. I prefer it to while (true), while (1), while (42), while (!0) etc etc.
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Changing Vim indentation behavior by file type
...ds per filetype(s) this way, and they are guaranteed to be executed in the order given.
– underscore_d
Oct 20 '15 at 16:13
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Sublime Text 2 - View whitespace characters
...or scheme, you'll find general settings — background, caret, foreground, etc. The "invisibles" key is the color you want to change.
– Roger_S
Aug 26 '13 at 15:35
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How to add new column to MYSQL table?
...text box as such in the SQL statement. You must make sure you escape it in order to avoid an SQL injection vulnerability.
– Costi Ciudatu
Feb 1 '14 at 21:56
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Convert base-2 binary number string to int
...'{0b1011010:#0}')
>>> bin_2_decimal
90
binary to octal hexa and etc.
>>> f'{0b1011010:#o}'
'0o132' # octal
>>> f'{0b1011010:#x}'
'0x5a' # hexadecimal
>>> f'{0b1011010:#0}'
'90' # decimal
Pay attention to 2 piece of information separated by colon.
I...