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Difference between filter and filter_by in SQLAlchemy
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edited May 24 '17 at 16:06
Jonathan Hartley
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an...
How to create a bash script to check the SSH connection?
...h -q user@downhost exit
$ echo $?
255
$ ssh -q user@uphost exit
$ echo $?
0
EDIT: Another approach would be to use nmap (you won't need to have keys or login-stuff):
$ a=`nmap uphost -PN -p ssh | grep open`
$ b=`nmap downhost -PN -p ssh | grep open`
$ echo $a
22/tcp open ssh
$ echo $b
(empty st...
What exactly does the Access-Control-Allow-Credentials header do?
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edited Jun 10 '17 at 22:01
John
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How do I initialize the base (super) class?
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150
Python (until version 3) supports "old-style" and new-style classes. New-style classes are deriv...
How to check if a Unix .tar.gz file is a valid file without uncompressing?
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answered Jan 4 '10 at 19:51
Rob WellsRob Wells
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What is the difference between object keys with quotes and without quotes?
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answered Dec 3 '10 at 18:10
bdukesbdukes
131k1919 gold badges136136 silver badges170170 bronze badges
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Difference between author and committer in Git?
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edited Sep 13 '13 at 0:53
answered Sep 12 '13 at 3:34
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MySQL error: key specification without a key length
...fied implicitly within a bracket right after its declaration, i.e VARCHAR(200) will limit it to 200 characters long only.
Sometimes, even though you don’t use TEXT or BLOB related type in your table, the Error 1170 may also appear. It happens in a situation such as when you specify VARCHAR column...
Make fill entire screen?
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206
html, body {
margin: 0;
height: 100%;
}
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How can I pass command-line arguments to a Perl program?
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190
Depends on what you want to do. If you want to use the two arguments as input files, you can jus...