大约有 5,000 项符合查询结果（耗时：0.0327秒） [XML]
Hidden features of C
...
A big negative is that GCC does not have a flag to catch signed integer overflows and throw a runtime exception. While there are x86 flags for detecting such cases, GCC does not utilize them. Having such a flag would allow non-performance-critical (especially legacy) applic...
Label encoding across multiple columns in scikit-learn
... return self.fit(X,y).transform(X)
Suppose we want to encode our two categorical attributes (fruit and color), while leaving the numeric attribute weight alone. We could do this as follows:
MultiColumnLabelEncoder(columns = ['fruit','color']).fit_transform(fruit_data)
Which transforms our ...
Is it secure to store passwords as environment variables (rather than as plain text) in config files
I work on a few apps in rails, django (and a little bit of php), and one of the things that I started doing in some of them is storing database and other passwords as environment variables rather than plain text in certain config files (or in settings.py, for django apps).
...
Verify a certificate chain using openssl verify
I'm building a own certificate chain with following componenents:
7 Answers
7
...
Using variables inside a bash heredoc
...s.
In your second example, the shell invokes sudo only with the parameter cat, and the redirection applies to the output of sudo cat as the original user. It'll work if you try:
sudo sh -c "cat > /path/to/outfile" <<EOT
my text...
EOT
...
Download file from web in Python 3
...download_and_keep_on_memory(URL('http://statics.591.com.tw/tools/showPhone.php?info_data=rLsGZe4U%2FbphHOimi2PT%2FhxTPqI&type=rLEFMu4XrrpgEw'),
headers, # You may need this. Otherwise, some websites will send the 404 error to you.
...
Save modifications in place with awk
...nges to file, similar to sed where I would use -i option to save modifications to a file.
8 Answers
...
Is there a “goto” statement in bash?
...nlike most of the methods described above).
#!/bin/bash
echo "Run this"
cat >/dev/null <<GOTO_1
echo "Don't run this"
GOTO_1
echo "Also run this"
cat >/dev/null <<GOTO_2
echo "Don't run this either"
GOTO_2
echo "Yet more code I want to run"
To put your script back to no...
What is
...extends Comparable<? super T>>, it's when you have something like Cat extends Animal implements Comparable<Animal>.
Look at the signature of Collections.sort
public static <T extends Comparable<? super T>> void sort(List<T> list)
Therefore, with a List<Cat> li...
What does set -e mean in a bash script?
... pipeline still run, even with set -o errexit. For example: echo success | cat - <(echo piping); echo continues, where echo success represents a successful, but fallible command, will print success, piping, and continues, but false | cat - <(echo piping); echo continues, with false representin...