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What is the 'instanceof' operator used for in Java?
...c {}
class Animal {}
class Dog extends Animal implements Domestic {}
class Cat extends Animal implements Domestic {}
Imagine a dog object, created with Object dog = new Dog(), then:
dog instanceof Domestic // true - Dog implements Domestic
dog instanceof Animal // true - Dog extends Animal
dog ...
PowerShell equivalent to grep -f
...helps somebody:
PowerShell:
PS) new-alias grep findstr
PS) ls -r *.txt | cat | grep "some random string"
Explanation:
ls - lists all files
-r - recursively (in all files and folders and subfolders)
*.txt - only .txt files
| - pipe the (ls) results to next command (cat)
cat...
How to concatenate two IEnumerable into a new IEnumerable?
...same T ). I want a new instance of IEnumerable<T> which is the concatenation of both.
4 Answers
...
Turning off auto indent when pasting text into vim
...sn't any easier than :set noai followed by :set ai. The suggestion of :r! cat is shorter.
– Leopd
May 26 '10 at 21:34
71
...
How do I append text to a file?
...
cat >> filename
This is text, perhaps pasted in from some other source.
Or else entered at the keyboard, doesn't matter.
^D
Essentially, you can dump any text you want into the file. CTRL-D sends an end-of-file signa...
How to redirect output of an already running process [duplicate]
...e Redirecting Output from a Running Process.
Firstly I run the command cat > foo1 in one session and test that data from stdin is copied to the file. Then in another session I redirect the output.
Firstly find the PID of the process:
$ ps aux | grep cat
rjc 6760 0.0 0.0 1580 376 pts/5 S...
How to grep for two words existing on the same line? [duplicate]
...ed, the man pages are pretty much the last place you want to go for clarification. They're more confusing than randomly guessing.
– corsiKa
Jun 25 '11 at 21:45
5
...
What is a non-capturing group in regular expressions?
...enthesis.
Consider the expressions (a|b)c and a|bc, due to priority of concatenation over |, these expressions represent two different languages ({ac, bc} and {a, bc} respectively).
However, the parenthesis are also used as a matching group (as explained by the other answers...).
When you want to...
How to download a file from server using SSH? [closed]
...priate.
If you want to access EC2 (or other service that requires authenticating with a private key), use the -i option:
scp -i key_file.pem your_username@remotehost.edu:/remote/dir/foobar.txt /local/dir
From: http://www.hypexr.org/linux_scp_help.php
...
Multiline syntax for piping a heredoc; is this portable?
...
And includes this example of multiple "here-documents" in the same line:
cat <<eof1; cat <<eof2
Hi,
eof1
Helene.
eof2
So there is no problem doing redirections or pipes. Your example is similar to something like this:
cat file |
cmd
And the shell grammar (further down on the link...