stdin

Please move down to the 2nd update. I didn't want to change the previous context of this question. I'm using wkhtmltoimage from a Java app. The standard way of using it is - path-to-exe http://url.com/ image.png . According to their docs, if we write a - instead of an input URL, the input shifts to STDIN. I'm starting the process using ProcessBuilder - ProcessBuilder pb = new ProcessBuilder(exe_path, " - ", image_save_path); Process process = pb.start(); Now I'm unable to figure out how to pipe an input stream to this process. I have a template file read into a DataInputStream , and I'm

I want to make a Java program that reads a Password from STDIN silently. I mean, without outputting any pressed chars to the terminal and keeping it hidden from commandline history and the operating system processlist ps . The class java.io.Console may be useful: System.console().readPassword(); This reads a sequence of chars from the console, without echoing anything. Note that it only works when you launch your java application with a real console. Otherwise, System.console() returns null. A less secure option to get the password via STDIN that works with background jobs, virtual consoles,

On Unix I would do something like: cat > file.txt How can I do this on the Windows command prompt or batch file? EDIT: Basically, I am looking for the functionality of cat with no arguments (it reads from stdin and spits it back out to stdout). Mark K Cowan TYPE CON CON is the MS-DOS device for console input. You can redirect to a file as follows: TYPE CON>output.txt To terminate, hit Ctrl + C or Ctrl + Z , Enter ( Ctrl + Z = EOF). If all you want is to read stdin and write what you read to stdout, then FINDSTR may work, depending on how you use it. FINDSTR will output an exact binary image of

I've been solving a few problems on SPOJ.pl using python 3.1.2 and some peoples fast result on simple problems makes me wonder if there is a faster way to handle input and output. I've tried using input() print() and sys.stdin.readline() sys.stdout.write() or rather for line in sys.stdin: #Handle input sys.stdout.write(output) to process each line. I've also tried to collect all output in lists and print all at once when everything is processed. But all of these produce similar execution times. Is there any faster way to handle input and output from stdin/out? The following will probably be

I am trying to use select() to read keyboard input and I got stuck in that I do not know how to read from keyboard and use a file descriptor to do so. I've been told to use STDIN and STDIN_FILENO to approach this problem but I am still confused. How can I do it? Youre question sounds a little confused. select() is used to block until input is available. But you do the actual reading with normal file-reading functions (like read , fread , fgetc , etc.). Here's a quick example. It blocks until stdin has at least one character available for reading. But of course unless you change the terminal to