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What is InputStream & Output Stream? Why and when do we use them?
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jmattheis
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answered Dec 2 '09 at 5:12
Chip UniChip Uni
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Linux command (like cat) to read a specified quantity of characters
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194
head works too:
head -c 100 file # returns the first 100 bytes in the file
..will extract th...
No increment operator (++) in Ruby? [duplicate]
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247
Ruby has no pre/post increment/decrement operator. For instance, x++ or x-- will fail to par...
Is there a (repeat-last-command) in Emacs?
...is Conway
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answered Nov 9 '08 at 12:35
cmscms
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How do I specify a pointer to an overloaded function?
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milleniumbug
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answered May 31 '10 at 8:57
In silicoIn silico
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PostgreSQL Crosstab Query
...O tbl VALUES
('A', 'Active', 1), ('A', 'Inactive', 2)
, ('B', 'Active', 4), ('B', 'Inactive', 5)
, ('C', 'Inactive', 7); -- ('C', 'Active') is missing
Simple form - not fit for missing attributes
crosstab(text) with 1 input parameter:
SELECT *
FROM crosstab(
'SELECT ...
Applying a function to every row of a table using dplyr?
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answered Jul 14 '14 at 0:20
alexwhanalexwhan
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Setting an environment variable before a command in Bash is not working for the second command in a
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324
FOO=bar bash -c 'somecommand someargs | somecommand2'
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Check if database exists in PostgreSQL using shell
... | | | | | postgres=CTc/postgres
(4 rows)
Using the naive approach means that searching for a database called "List, "Access" or "rows" will succeed. So we pipe this output through a bunch of built-in command line tools to only search in the first column.
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