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Git repository broken after computer died
...ou to figure out what the master ref should be so you can restore it (i.e. cat the correct SHA1 into .git/refs/heads/master).
In case any object contained in that commit is genuinely corrupted you can't restore your HEAD commit unfortunately. Assuming your working tree and/or index are intact you c...
Display filename before matching line
...
If you have the options -H and -n available (man grep is your friend):
$ cat file
foo
bar
foobar
$ grep -H foo file
file:foo
file:foobar
$ grep -Hn foo file
file:1:foo
file:3:foobar
Options:
-H, --with-filename
Print the file name for each match. This is the default when there is
m...
Accessing @attribute from SimpleXML
...ode. You can then var_dump the return value of the function.
More info at php.net
http://php.net/simplexmlelement.attributes
Example code from that page:
$xml = simplexml_load_string($string);
foreach($xml->foo[0]->attributes() as $a => $b) {
echo $a,'="',$b,"\"\n";
}
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Why do people say that Ruby is slow? [closed]
...me:
Ruby 1.9 vs. Python3 within the same order of magnitude
Ruby 1.9 vs. PHP within the same order of magnitude
Ruby 1.9 vs. Java 6 server up to two orders of magnitude slower!
Ruby 1.9 vs. C (gcc) up to two orders of magnitude slower!
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Why is Ruby considered slow?
Depends on whom you as...
How to programmatically send a 404 response with Express/Node?
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Nowadays there's a dedicated status function for this on the response object. Just chain it in somewhere before you call send.
res.status(404) // HTTP status 404: NotFound
.send('Not found');
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How to apply shell command to each line of a command output?
... to append a random ID between 1000 and 15000, when SED matches a line. cat /logs/lfa/Modified.trace.log.20150904.pw | sed -r 's/^(.*)(\|006\|00032\|)(.*)$/echo "\1\2\3 - ID `shuf -i 999-14999 -n 1`"/e'
– sgsi
Sep 8 '15 at 21:37
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What's the best way to use R scripts on the command line (terminal)?
...
Next, make it executable (on the command line):
chmod +x script.r
Invocation from command line:
./script.r world
# Hello world
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How to show the last queries executed on MySQL?
... remember to clear out your general log table when you are finished: "truncate table mysql.general_log"
– pdwalker
Oct 3 '14 at 5:06
1
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Using Python String Formatting with Lists
... need to write out a formatted string. The following doesn't work, but indicates what I'm trying to do. In this example, there are three %s tokens and the list has three entries.
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Why does JQuery have dollar signs everywhere?
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Unless you are using another language like PHP to populate javascript in your site using HTMLdocs, at which point that dollar sign serves the additional purpose of breaking everything since PHP does use the dollar sign to start all variables. (A reason that if you're ...