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Tool to read and display Java .class versions
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On Unix-like
file /path/to/Thing.class
Will give the file type and version as well. Here is what the output looks like:
compiled Java class data, version 49.0
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How do I send a file as an email attachment using Linux command line?
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@fugitive means "end of options". Take a look at unix.stackexchange.com/questions/11376/…
– rynop
Feb 9 '17 at 16:27
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Compiling with g++ using multiple cores
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There is no such flag, and having one runs against the Unix philosophy of having each tool perform just one function and perform it well. Spawning compiler processes is conceptually the job of the build system. What you are probably looking for is the -j (jobs) flag to GNU make, ...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...实时性的场景，主要用于离线的分析。
基于MapRduce模型编程做数据的分析，开发上效率不高，位于hadoop之上Hive的出现使得数据的分析可以类似编写sql的方式进行，sql经过语法分析、生成执行计划后最终生成MapReduce任务进行执行...
what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
...namenodehost).
Most of the commands in FS shell behave like corresponding Unix commands. Differences are described with each of the commands. Error information is
sent to stderr and the output is sent to stdout.
If HDFS is being used,
hdfs dfs
is a synonym.
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RE error: illegal byte sequence on Mac OS X
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I think it's safe to say that the Unix world has embraced UTF-8 at this point: the default LC_CTYPE value is usually <lang_region>.UTF-8, so any file without a BOM (byte-order mark) is therefore interpreted as a UTF-8 file. It is only in the Windows wor...
How do you format an unsigned long long int using printf?
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This isn't a Linux/UNIX thing, the "ll" length modifier was added to Standard C in C99, if it doesn't work in "Microsoft C" then it is because they are not standards compliant.
– Robert Gamble
Oct 17 '08 a...
Python strftime - date without leading 0?
... can remove the leading zero.
For example %Y/%-m/%-d.
This only works on Unix (Linux, OS X), not Windows (including Cygwin). On Windows, you would use #, e.g. %Y/%#m/%#d.
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What are the benefits of learning Vim? [closed]
... it useful? Yes.
Reasons for Learning
vi is guaranteed to exist on all Unix systems and exists on most Linux ones as well. That kind of broad coverage makes learning it worth it.
It's much quicker to use vi for a sudo edit:
$ sudo vi
Also, GMail uses vi-ish commands for selecting & moving...
How do I 'svn add' all unversioned files to SVN?
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This uses UNIX tools (grep, sed, bash) which the OP said he didn't have.
– Naaff
Jul 1 '09 at 23:55
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