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理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...ines of: 如果不用with语句，代码如下：
file = open("/tmp/foo.txt")
data = file.read()
file.close()
There are two annoying things here. First, you end up forgetting to close the file handler. The second is how to handle exceptions that may occur once the file handler has been obtaine...
OS X: equivalent of Linux's wget
...instance Ubuntu on an AWS instance, use:
wget http://example.com/textfile.txt
On a Mac, i.e. for local development, use this:
curl http://example.com/textfile.txt -o textfile.txt
The -o parameter is required on a Mac for output into a file instead of on screen. Specify a different target name ...
How do I grep recursively?
...uld like, another method is to use --include option:
grep -r --include "*.txt" texthere .
You can also mention files to exclude with --exclude.
Ag
If you frequently search through code, Ag (The Silver Searcher) is a much faster alternative to grep, that's customized for searching code. For inst...
How do I find which program is using port 80 in Windows? [duplicate]
...coming connections.
You can also run netstat -anb >%USERPROFILE%\ports.txt followed by start %USERPROFILE%\ports.txt to open the port and process list in a text editor, where you can search for the information you want.
You can also use PowerShell to parse netstat output and present it in a bet...
Restore file from old commit in git
...
git checkout 'master@{7 days ago}' -- path/to/file.txt
This will not alter HEAD, it will just overwrite the local file path/to/file.txt
See man git-rev-parse for possible revision specifications there (of course a simple hash (like dd9bacb) will do nicely)
Don't forget to...
Pipe output and capture exit status in Bash
...d in your last foreground pipeline of commands.
<command> | tee out.txt ; test ${PIPESTATUS[0]} -eq 0
Or another alternative which also works with other shells (like zsh) would be to enable pipefail:
set -o pipefail
...
The first option does not work with zsh due to a little bit differen...
How can I read command line parameters from an R script?
...te(length(readLines(file)) * opt$factor))
}
Given an arbitrary file blah.txt with 23 lines.
On the command line:
Rscript script.R -h outputs
Usage: script.R [options] file
Options:
-n, --count_lines
Count the line numbers [default]
-f FACTOR, --factor=FACTOR
...
What is the difference between 'java', 'javaw', and 'javaws'?
...ion works with javaw:
javaw -cp ... mypath.MyClass ... arguments 1>log.txt 2>err.txt
It means, if the Java application prints out anything via System.out or System.err, it is written to those files, as also with using java (without w). Especially on starting java, the JRE may write starting...
Creating an empty file in C#
...TF8 encoding (or unicode or something else): <File.WriteAllText("c:\del.txt", String.Empty, System.Text.Encoding.UTF8);>
– Fil
Mar 8 '17 at 14:54
1
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File system that uses tags rather than folders?
...ra tags can appear as directories inside /etc/init.d. If there is a file a.txt with three tags i.e 'etc', 'init.d' & 'asdf' then 'asdf' will appear as directory inside /etc/init.d and full path of a.txt will become /etc/init.d/asdf/a.txt.
...