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云数据及Firebase组件简介 · App Inventor 2 中文网
...存储在 Firebase 中。 当添加新消息时，所有用户都将看到完整的历史记录列表。
相反，其他应用程序无法访问这些变量。 使用 FirebaseDB 组件的不同应用程序将拥有自己单独的云变量存储，并且不会干扰，即使它使用相同的标签...
云数据及Firebase组件简介 · App Inventor 2 中文网
...存储在 Firebase 中。 当添加新消息时，所有用户都将看到完整的历史记录列表。
相反，其他应用程序无法访问这些变量。 使用 FirebaseDB 组件的不同应用程序将拥有自己单独的云变量存储，并且不会干扰，即使它使用相同的标签...
What are all the common ways to read a file in Ruby?
...
You can read the file all at once:
content = File.readlines 'file.txt'
content.each_with_index{|line, i| puts "#{i+1}: #{line}"}
When the file is large, or may be large, it is usually better to process it line-by-line:
File.foreach( 'file.txt' ) do |line|
puts line
end
Sometimes you ...
How do I determine file encoding in OS X?
...r instance if you go into Terminal and use vi to create a file eg. vi test.txt
then insert some characters and include an accented character (try ALT-e followed by e)
then save the file.
They type file -I text.txt and you should get a result like this:
test.txt: text/plain; charset=utf-8
...
Replace whitespaces with tabs in linux
..."\t" '$1=$1' file1
or SED if you preffer
sed 's/[:blank:]+/,/g' thefile.txt > the_modified_copy.txt
or even tr
tr -s '\t' < thefile.txt | tr '\t' ' ' > the_modified_copy.txt
or a simplified version of the tr solution sugested by Sam Bisbee
tr ' ' \\t < someFile > someFile
...
Remove blank lines with grep
...
Try the following:
grep -v -e '^$' foo.txt
The -e option allows regex patterns for matching.
The single quotes around ^$ makes it work for Cshell. Other shells will be happy with either single or double quotes.
UPDATE: This works for me for a file with blank ...
How to do a simple file search in cmd
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dir /b/s *.txt
searches for all txt file in the directory tree. Before using it just change the directory to root using
cd/
you can also export the list to a text file using
dir /b/s *.exe >> filelist.txt
and search wit...
What is the most useful script you've written for everyday life? [closed]
...e set an AT job to run this command daily in C:\
dir /s /b * > dirlist.txt
This lists the full path of all files on the C drive. Then whenever I need to find a file, I can use findstr. This beats using Windows Explorer Search since it allows regular expression matching on the entire path. For ...
opposite of .gitignore file? [duplicate]
...
You can use .gitignore for that.
*
!file0.txt
!file1.txt
In a case where you interested in file0.txt and file1.txt.
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Remove duplicate entries using a Bash script [duplicate]
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You can sort then uniq:
$ sort -u input.txt
Or use awk:
$ awk '!a[$0]++' input.txt
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