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How to get the first line of a file in a bash script?
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Significantly more overhead than the read approach. $() forks off a subshell, and using an external command (any external command) means you're calling execve(), invoking the linker and loader (if it's using shared libraries, which is usually the case), etc.
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What's the difference between an exclusive lock and a shared lock?
...lockable) in a class room containing a teacher (writer) and many students (readers).
While a teacher is writing something (exclusive lock) on the board:
Nobody can read it, because it's still being written, and she's blocking your view => If an object is exclusively locked, shared locks cannot...
How to open a file for both reading and writing?
Is there a way to open a file for both reading and writing?
4 Answers
4
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How do you determine the ideal buffer size when using FileInputStream?
...s to a lot of files (>= 100,000). How big should I make the buffer used to read from the files to maximize performance?
9 A...
Read a text file using Node.js?
I need to pass in a text file in the terminal and then read the data from it, how can I do this?
5 Answers
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AttributeError(“'str' object has no attribute 'read'”)
...he problem is that for json.load you should pass a file like object with a read function defined. So either you use json.load(response) or json.loads(response.read()).
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Python read-only property
...sense for an attribute to be settable (such as a derived value, or a value read from some static datasource), the getter-only property is generally the preferred pattern.
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Load data from txt with pandas
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You can use:
data = pd.read_csv('output_list.txt', sep=" ", header=None)
data.columns = ["a", "b", "c", "etc."]
Add sep=" " in your code, leaving a blank space between the quotes. So pandas can detect spaces between values and sort in columns. Da...
java.net.SocketException: Connection reset
I am getting the following error trying to read from a socket. I'm doing a readInt() on that InputStream , and I am getting this error. Perusing the documentation this suggests that the client part of the connection closed the connection. In this scenario, I am the server.
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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 |@@@@@@@@@@@@@@@@@@@@ ...