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nodeJs callbacks simple example
...e of using both functions.
Synchronous:
var data = fs.readFileSync('test.txt');
console.log(data);
The code above blocks thread execution until all the contents of test.txt are read into memory and stored in the variable data. In node this is typically considered bad practice. There are times th...
How does a public key verify a signature?
...ncrypting):
openssl rsautl -encrypt -inkey public.pem -pubin -in message.txt -out message.ssl
openssl rsautl -decrypt -inkey private.pem -in message.ssl -out message.txt
Private key encrypts, public key decrypts (signing):
openssl rsautl -sign -inkey private.pem -in message.txt ...
CMake: How to build external projects and include their targets
... have to install Project A manually before invoking Project B's CMakeLists.txt - just like any other third-party dependency added this way or via find_file / find_library / find_package.
If you want to make use of ExternalProject_Add, you'll need to add something like the following to your CMakeLis...
How to create a GUID/UUID in Python
... for the device's permanent UUID. Throws if command missing/fails.
txt = subprocess.check_output("wmic csproduct get uuid").decode()
# Attempt to extract the UUID from the command's result.
match = re.search(r"\bUUID\b[\s\r\n]+([^\s\r\n]+)", txt)
if match is not None...
What is the difference between NTFS Junction Points and Symbolic Links?
..."C:\symlink" both target "E:\spam", and the relative symlink "E:\spam\eggs.txt" targets "..\eggs.txt". Then "C:\junction\eggs.txt" resolves to "C:\eggs.txt", and "C:\symlink\eggs.txt" resolves to "E:\eggs.txt".
– Eryk Sun
Dec 25 '19 at 23:29
...
Read a variable in bash with a default value
...
Code:
IN_PATH_DEFAULT="/tmp/input.txt"
read -p "Please enter IN_PATH [$IN_PATH_DEFAULT]: " IN_PATH
IN_PATH="${IN_PATH:-$IN_PATH_DEFAULT}"
OUT_PATH_DEFAULT="/tmp/output.txt"
read -p "Please enter OUT_PATH [$OUT_PATH_DEFAULT]: " OUT_PATH
OUT_PATH="${OUT_PATH:-...
node.js: read a text file into an array. (Each line an item in the array.)
...
console.log('Line: ' + data);
}
var input = fs.createReadStream('lines.txt');
readLines(input, func);
EDIT: (in response to comment by phopkins) I think (at least in newer versions) substring does not copy data but creates a special SlicedString object (from a quick glance at the v8 source cod...
Modifying the “Path to executable” of a windows service
...ot all 'QueryServiceConfig' :)
>SC QUERY > "%computername%-services.txt" [enter]
>FIND "SERVICE_NAME: " "%computername%-services.txt" /i > "%computername%-services-name.txt" [enter]
>NOTEPAD2 "%computername%-services-name.txt" [enter]
Do 'small' NOTEPAD2 editing..
Then, contin...
Git diff output to file preserve coloring
...
Try:
git diff --color > foo.txt
Then later issue:
cat foo.txt
Or:
less -R foo.txt
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How to create directories recursively in ruby?
I want to store a file as /a/b/c/d.txt, but I do not know if any of these directories exist and need to recursively create them if necessary.
How can one do this in ruby?
...