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PostgreSQL: Show tables in PostgreSQL
What's the equivalent to show tables (from MySQL) in PostgreSQL?
24 Answers
24
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Select N random elements from a List in C#
I need a quick algorithm to select 5 random elements from a generic list. For example, I'd like to get 5 random elements from a List<string> .
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How to test an Internet connection with bash?
...
Without ping
#!/bin/bash
wget -q --spider http://google.com
if [ $? -eq 0 ]; then
echo "Online"
else
echo "Offline"
fi
-q : Silence mode
--spider : don't get, just check page availability
$? : shell return code
0 : shell "All OK" code
Withou...
How do I determine file encoding in OS X?
...ans that the file has extended file attributes associated with it. You can query them using the getxattr() function.
There's no definite way to detect the encoding of a file. Read this answer, it explains why.
There's a command line tool, enca, that attempts to guess the encoding. You might want t...
Wget output document and headers to STDOUT
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Try the following, no extra headers
wget -qO- www.google.com
Note the trailing -. This is part of the normal command argument for -O to cat out to a file, but since we don't use > to direct to a file, it goes out to the shell. You can use -qO- or -qO -.
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Ternary Operator Similar To ?:
...t; {x => x.endsWith("$") ? x.init | x}
res1: String = List
Is this adequate for your needs?
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What is the fastest way to send 100,000 HTTP requests in Python?
I am opening a file which has 100,000 URL's. I need to send an HTTP request to each URL and print the status code. I am using Python 2.6, and so far looked at the many confusing ways Python implements threading/concurrency. I have even looked at the python concurrence library, but cannot figure ...
How to export data as CSV format from SQL Server using sqlcmd?
I can quite easily dump data into a text file such as:
11 Answers
11
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Swift - encode URL
...lt;>?@[\]^`{|}
URLPathAllowedCharacterSet "#%;<>?[\]^`{|}
URLQueryAllowedCharacterSet "#%<>[\]^`{|}
URLUserAllowedCharacterSet "#%/:<>?@[\]^`
If you want a different set of characters to be escaped create a set:
Example with added "=" character:
var originalStri...
Can git operate in “silent mode”?
...ike a natural way of doing it to me. Although I have in the past defined a quiet_git shell function like this for use in cron jobs:
quiet_git() {
stdout=$(tempfile)
stderr=$(tempfile)
if ! git "$@" </dev/null >$stdout 2>$stderr; then
cat $stderr >&2
rm -...