I can use the following command in the terminal:
myfile < input > output
But how do for CLion automatically use these parameters?
Related
I trying write a program with bash file that create a text file then write the List of running programs file in the text file. I created a text file with bash that name is test.txt, how can I write List of running programs in the text file?
I put my code here:
#!/bin/bash
cat test.txt
To get a list of running programs, use ps. Run man ps for details.
To redirect the output of a command to a file, use >.
ps > test.txt
See REDIRECTION in man bash for details.
My understanding is that the redirection operator, <, should allow me to take text from a file and give it as input to another file as if I had written out the contents of that file. Here is what I am trying to do:
python code.py < input.txt
I expect this to act as though I had typed the contents of input.txt after python code.py, but instead it acts as if I passed no input.
If I use cat, I get the contents of the file:
> cat input.txt
['2015-1-1','2015-5-1','2015-9-1','2015-10-1','2015-12-1','2016-1-1','2016-2-1','2016-4-1','2016-5-1'] [65,50,30,45,55,39,45,30,20]
And if I just copy and paste the contents of the file, I get the correct behavior.
I know this must be a really simple misunderstanding on my part, but I can't figure it out.
It's called Redirection, not piping, but you are correct that the < operator will push the file to the command. You can see this in action by using Sort instead of echo.
sort < input.txt
This will display the text file as a list, sorted alphabetically. Echo does not work with text files, so sending a text file to Echo simply runs "Echo".
If you just want to send a file to the command window, you can use Type instead, and not use the redirector.
type input.txt
When I run an a.exe file as below it is running fine:
C:\forc>a.exe 'iss mac'
6
(Output is 6)
How to provide this input from a text file?
I tried the below but no luck:
C:\forc>a.exe < input.txt
C:\forc>a.exe 'input.txt'
Kindly help.
the only time that you will be able to pass file contents into a program is when the program accepts a filename in the command line arguments or if the program is designed in a way that lets it read all the contents of the standard input stream. For example, in C#, you would treat Console.In in the same way you would treat a file input stream (read lines, chars, etc)
in conclusion
the program must directly support consuming data from standard input in order to use the < redirection. Standard Input is NOT the same as a command line argument.
Whether you can send input to a.exe depends entirely on a.exe. You will need to read the documentation for a.exe, or ask its author, to determine whether what you want to do is possible.
From Alexei Levenkov answer :
Using command redirection operators
program.exe < input.txt > output.txt
I wish to put the text from command prompt into a text file once the test is run. How do we do that
?
Just use a pipe >. Worth to look Using command redirection operators.
ruby test.rb > file.txt
Redirection operator and description
> : Writes the command output to a file or a device, such as a printer, instead of the Command Prompt window.
< : Reads the command input from a file, instead of reading input from the keyboard.
>> : Appends the command output to the end of a file without deleting the information that is already in the file.
>& : Writes the output from one handle to the input of another handle.
<& : Reads the input from one handle and writes it to the output of another handle.
| : Reads the output from one command and writes it to the input of another command. Also known as a pipe.
I am new to Perl and I am executing a .pl file within the CommandPrompt dialog box in Windows 7 by doing the following:
c:\perlscripts\runReport.pl 5
In addition to seeing the output in the CommandPrompt dialog box is there a way that I can redirect the output to a text file as well?
Any help/direction would be appreciated. Regards.
If you append '> filename.txt' to your line, it will output the results to a file instead. If you want to do both, there is apparently the wintee utility at http://code.google.com/p/wintee/. If it is similar to UNIX tee, than using it should only require you to append '| tee filename.txt' to your line.
Instead of printing the output in command line.
You can write the output in a file.
# Opening file to write the program's output.
open(FH, ">myFile.txt") or die "Cannot open myFile.txt";
# include module to dump output.
use Data::Dumper;
print FH Dumper(#output);
close FH;
Else you can write like this:
perl my_script.pl > myFile.txt