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How to use sed to replace only the first occurrence in a file?
...in the answers - and to make the answer address the question directly, and then generalize, rather than generalize only. But good answer.
– Jonathan Leffler
Sep 29 '08 at 13:15
8
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How does a public key verify a signature?
...xample:
The sender sends:
A message
Takes a known hash of the message, then encrypts the hash with the private key
The receiver:
Decrypts (2) and gets a hash value
Hashes the message (1) with the same hash used by the sender
Compares the two hashes to make sure they match
This again ensure...
Sort a list by multiple attributes?
...1, 2))
And notice that here you can use sort instead of using sorted and then reassigning:
s.sort(key = operator.itemgetter(1, 2))
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What does the term “porcelain” mean in Git?
...
I think the answer makes sense to me, but then again, I'm assuming Linus was the one that coined the term, so I tend to adjust my brain to be a little more direct and crass when parsing his world. :)
– Nick Klauer
Oct 21 '11 at ...
How to append output to the end of a text file
...ove newlines from the string. If you fail to properly quote the argument, then the shell will split the string and pass arguments to echo and echo never even sees the newlines.
– William Pursell
Jan 29 at 23:23
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How to “comment-out” (add comment) in a batch/cmd?
...sed in the days that computers weren't very fast.
REM'ed line are read and then ingnored. ::'ed line are ignored all the way. This could speed up your code in "the old days". Further more after a REM you need a space, after :: you don't.
And as said in the first comment: you can add info to any lin...
Arduino Sketch upload issue - avrdude: stk500_recv(): programmer is not responding
...ch on verbose output during upload (in the Arduino IDE preferences pane).
Then, when uploading, you can see AVRDUDE sending three packets avrdude: Send: 0 [30] [20] (with corresponding RX flashes on the board) right before the avrdude: ser_recv(): programmer is not responding error.
The trick is...
Determine project root from a running node.js application
...ever process.env.NODE_PATH points. If you set this environmental variable, then you can require modules with the standard module loader without any other changes.
For example, if you set NODE_PATH to /var/www/lib, the the following would work just fine:
require('module2/component.js');
// ^ looks ...
How to squash all git commits into one?
...p all the commit messages you could first do git log > original.log and then edit that for your initial commit message in the new repository:
rm -rf .git
git init
git add .
git commit
or
git log > original.log
# edit original.log as desired
rm -rf .git
git init
git add .
git commit -F orig...
How do I remove the “extended attributes” on a file in Mac OS X?
...pen Terminal.app and start typing xattr -rc, include a trailing space, and then then drag the file or folder to the Terminal.app window and it will automatically add the full path with proper escaping.
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