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Byte order mark screws up file reading in Java
I'm trying to read CSV files using Java. Some of the files may have a byte order mark in the beginning, but not all. When present, the byte order gets read along with the rest of the first line, thus causing problems with string compares.
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How do cache lines work?
...gs in about 64 bytes at a time, whatever the size of the actual data being read.
5 Answers
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Generating an MD5 checksum of a file
...on't be able to fit the whole file in memory. In that case, you'll have to read chunks of 4096 bytes sequentially and feed them to the md5 method:
import hashlib
def md5(fname):
hash_md5 = hashlib.md5()
with open(fname, "rb") as f:
for chunk in iter(lambda: f.read(4096), b""):
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How to read an entire file to a string using C#?
What is the quickest way to read a text file into a string variable?
16 Answers
16
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Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
...d again. It will however, be accessed (via get(key) only) from multiple threads. Is it safe to use a java.util.HashMap in this way?
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how to read System environment variable in Spring applicationContext
How to read the system environment variable in the application context?
11 Answers
11
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How to compare 2 files fast using .NET?
Typical approaches recommend reading the binary via FileStream and comparing it byte-by-byte.
18 Answers
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How to kill a child process after a given timeout in Bash?
...ut (sudo apt-get install timeout) and use it like: (most Systems have it already installed otherwise use sudo apt-get install coreutils)
timeout 10 ping www.goooooogle.com
If you don't want to download something, do what timeout does internally:
( cmdpid=$BASHPID; (sleep 10; kill $cmdpid) & ...
bpftrace教程【官方】 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...统计。
在bpftrace结束(如按Ctrl-C)时Maps自动打印出来
5. read()分布统计
# bpftrace -e 'tracepoint:syscalls:sys_exit_read /pid == 18644/ { @bytes = hist(args->ret); }'
Attaching 1 probe...
^C
@bytes:
[0, 1] 12 |@@@@@@@@@@@@@@@@@@@@ ...
How do I execute a command and get the output of the command within C++ using POSIX?
...;iostream>
int main()
{
// run a process and create a streambuf that reads its stdout and stderr
redi::ipstream proc("./some_command", redi::pstreams::pstdout | redi::pstreams::pstderr);
std::string line;
// read child's stdout
while (std::getline(proc.out(), line))
std::cout <&...