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Looping through the content of a file in Bash
How do I iterate through each line of a text file with Bash ?
13 Answers
13
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Syntax for a single-line Bash infinite while loop
...ing up with the right combination of semicolons and/or braces. I'd like to do this, but as a one-liner from the command line:
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How to preview git-pull without doing fetch?
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After doing a git fetch, do a git log HEAD..origin/master to show the log entries between your last common commit and the origin's master branch. To show the diffs, use either git log -p HEAD..origin/master to show each patch, or g...
Disable a group of tests in rspec?
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How do you exactly do that on a block that has: describe 'XXXXX' do .... end
– p.matsinopoulos
Jul 13 '13 at 5:01
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Blocks and yields in Ruby
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I'm going to define a Person class initialized with a name, and provide a do_with_name method that when invoked, would just pass the name attribute, to the block received.
class Person
def initialize( name )
@name = name
end
def do_with_name
yield( @name )
en...
Using do block vs braces {}
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Ruby cookbook says bracket syntax has higher precedence order than do..end
Keep in mind that the bracket syntax
has a higher precedence than the
do..end syntax. Consider the following
two snippets of code:
1.upto 3 do |x|
puts x
end
1.upto 3 { |x| puts x }
# SyntaxError: compi...
How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
A very frequently asked question here is how to do an upsert, which is what MySQL calls INSERT ... ON DUPLICATE UPDATE and the standard supports as part of the MERGE operation.
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Iterate all files in a directory using a 'for' loop
...the files (and only the files) in the current directory:
for /r %i in (*) do echo %i
Also if you run that command in a batch file you need to double the % signs.
for /r %%i in (*) do echo %%i
(thanks @agnul)
share
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Best practices with STDIN in Ruby?
...t gets all input from named files or all from STDIN.
ARGF.each_with_index do |line, idx|
print ARGF.filename, ":", idx, ";", line
end
# print all the lines in every file passed via command line that contains login
ARGF.each do |line|
puts line if line =~ /login/
end
Thank goodness we did...
How do I run only specific tests in Rspec?
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It isn't easy to find the documentation, but you can tag examples with a hash. Eg.
# spec/my_spec.rb
describe SomeContext do
it "won't run this" do
raise "never reached"
end
it "will run this", :focus => true do
1.should == 1
end
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