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Is using Random and OrderBy a good shuffle algorithm?
... is to yield the numbers as soon as they are swapped. This will reduce the start-up cost, while keeping the iteration cost at O(1) (basically 5 operations per iteration). The total cost would remain the same, but the shuffling itself would be quicker. In cases where this is called as collection.Shuf...
SQL: deleting tables with prefix
...some
notions from other answers on the web.
I needed to delete all tables starting with 'temp_'
After a few iterations I came up with this block of code:
-- Set up variable to delete ALL tables starting with 'temp_'
SET GROUP_CONCAT_MAX_LEN=10000;
SET @tbls = (SELECT GROUP_CONCAT(TABLE_NAME)
...
Rearrange columns using cut
... such lines to a vector called @F ("F" - like Field). Perl indexes vectors starting from 0 unlike cut which indexes fields starting form 1.
You can add -F pattern (with no space between -F and pattern) to use pattern as a field separator when reading the file instead of the default whitespace
The ...
How to erase the file contents of text file in Python?
...seek(0) after f.truncate(0), else you will have weird \x00 appended at the start of the file.
– krishna chaitanya
May 10 at 8:47
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GDB corrupted stack frame - How to debug?
...al purpose registers and LR are stored in stack before the called function starts executing. Once the function finishes, the value of LR is poped into PC and hence the function returns. So If stack is corrupted, we can see a wrong value is PC right? In this case may be adjusting stack pointer will l...
What is the difference between return and return()?
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return is a keyword that signifies the start of a return statement.
– RobG
Apr 10 '14 at 13:14
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Keep ignored files out of git status
...ile
# git ls-files --others --exclude-from=.git/info/exclude
# Lines that start with '#' are comments.
# For a project mostly in C, the following would be a good set of
# exclude patterns (uncomment them if you want to use them):
# *.[oa]
# *~
Final content of "exclude" file
# git ls-files --oth...
Using multiple delimiters in awk
...erl code
Perl is closely related to awk, however, the @F autosplit array starts at index $F[0] while awk fields start with $1.
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Convert .pem to .crt and .key
...ad certificate 140584440387400:error:0906D06C:PEM routines:PEM_read_bio:no start line:pem_lib.c:703:Expecting: TRUSTED CERTIFICATE
– Damien Carol
May 20 '15 at 13:57
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How can I strip first and last double quotes?
...you process have double quotes you can use something like this:
if string.startswith('"') and string.endswith('"'):
string = string[1:-1]
Edit:
I'm sure that you just used string as the variable name for exemplification here and in your real code it has a useful name, but I feel obliged to w...