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How does the const constructor actually work?
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Const constructor creates a "canonicalized" instance.
That is, all constant expressions begin canonicalized, and later these "canonicalized" symbols are used to recognize equivalence of these constants.
Canonicalization:
A process for converting data that has more than one possible rep...
How to change language settings in R
... of the abbreviations can be found here.
Sys.getenv() gives you a list of all the environment variables that are set.
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Regex Email validation
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answered Mar 17 '11 at 16:56
AlexAlex
5,10011 gold badge2020 silver badges1818 bronze badges
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Cannot push to Git repository on Bitbucket
...ent every time you run GitBash:
$ cat ~/.bashrc
If you see a function called start_agent, this step has already been completed.
If no file, continue.
If there is a file that does not contain this function, you're in a sticky situation. It's probably safe to append to it (using the instructions ...
onCreateOptionsMenu inside Fragments
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edited Jul 11 '15 at 18:58
answered Jul 11 '15 at 17:50
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CORS - How do 'preflight' an httprequest?
...t involves configuring the server responses to include the "Access-Control-Allow-Origin" header and 'preflight' requests with and OPTIONS request. I got the idea from this post : Getting CORS working
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Making 'git log' ignore changes for certain paths
...e as match_pathspec_depth_1() and for correctness was only supposed to be called from match_pathspec_depth(). match_pathspec_depth() was later renamed to match_pathspec(), so the invariant we expect today is that do_match_pathspec() has no direct callers outside of match_pathspec().
Unfortunately,...
Efficiently test if a port is open on Linux?
... to connect by loopback. If it fails, then the port is closed or we aren't allowed access. Afterwards, close the connection.
Modify this for your use case, such as sending an email, exiting the script on failure, or starting the required service.
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How to send email from Terminal?
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Note all this solutions assume you have a locally installed MTA
– Miquel
Nov 24 '11 at 18:07
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How to exit a function in bash
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Community♦
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answered Aug 4 '13 at 11:12
mohitmohit
4,11833 gold badges161...