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Actual meaning of 'shell=True' in subprocess
... are all simple to replace with native Python constructs. A complex shell pipeline where parts or all cannot be reasonably rewritten in Python would be the one situation where perhaps you could consider using the shell. You should still make sure you understand the performance and security implica...
Why does Popen.communicate() return b'hi\n' instead of 'hi'?
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print(subprocess.Popen("echo -n hi", \
shell=True, stdout=subprocess.PIPE).communicate()[0])
As for the b preceding the string it indicates that it is a byte sequence which is equivalent to a normal string in Python 2.6+
http://docs.python.org/3/reference/lexical_analysis.html#literals
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也来说说ReactOS的调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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唉,白呀,打开”文件”?”Connect”,在端口那输入” \\.\pipe\com_1”下面默认,确定
提示
晕,怎么回事?用windbg就可以啦.打开源码看看,(有源代码就是好,^_^);这个程序的代码很少.
看到这,就知道怎么回事了(注意这段在D:\ReactOS\...
Does git return specific return error codes?
... are
lost.
The first way is when a command is in the upstream of a pipe. In a
pipe, only the return code of the last command is used. Thus, all other
commands will have their return codes masked.
Rewrite pipes so that there are no Git commands upstream.
The other way is when a com...
How to use find command to find all files with extensions from list?
...not work for me on mac, but works with the -E (extended) option (maybe the pipe is an extended feature?): find -E /path/to -iregex ".*\.(jpg|gif|png|jpeg)" > log
– ling
Oct 21 '15 at 7:38
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How to count lines in a document?
... < <filename>:
$ wc -l < /dir/file.txt
3272485
You can also pipe data to wc as well:
$ cat /dir/file.txt | wc -l
3272485
$ curl yahoo.com --silent | wc -l
63
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Count number of rows within each group
I have a dataframe and I would like to count the number of rows within each group. I reguarly use the aggregate function to sum data as follows:
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Set the value of a variable with the result of a command in a Windows batch file
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Note that if your command includes a pipe then you need to escape it with a caret, for example: for /f "delims=" %%a in ('echo foobar^|sed -e s/foo/fu/') do @set foobar=%%a
– yoyo
Apr 21 '15 at 22:42
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HTTP POST and GET using cURL in Linux [duplicate]
... @emoleumassi see x-yuri's comment before yours; you should be able to pipe the return into another command, such as less.
– AVProgrammer
Jul 21 '16 at 14:25
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How to See the Contents of Windows library (*.lib)
.../SYMBOLS and /EXPORTS don't work nowadays. I have to use /ALL with a |more pipe to see all functions in the .lib file.
– user5280911
Jun 21 '18 at 10:44
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