Is there a way to effectively do this in bash: /my/bash/script < echo ‘This string will be sent to stdin.’ I’m aware that I could pipe the output from the echo such as this: echo ‘This string will be piped to stdin.’ | /my/bash/script 6 Answers 6
I’m looking to process a text file with node using a command line call like: node app.js < input.txt Each line of the file needs to be processed individually, but once processed the input line can be forgotten. Using the on-data listener of the stdin, I get the input steam chunked by a byte size … Read more
I am rather confused with the purpose of these three files. If my understanding is correct, stdin is the file in which a program writes into its requests to run a task in the process, stdout is the file into which the kernel writes its output and the process requesting it accesses the information from, … Read more
The following Perl script (my.pl) can read from either the file in the command line arguments or from standard input (STDIN): while (<>) { print($_); } perl my.pl will read from standard input, while perl my.pl a.txt will read from a.txt. This is very handy. Is there an equivalent in Bash? 20 Answers 20
Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 1 year ago. Improve this question I want to deal with the command line input in Ruby: > cat input.txt | myprog.rb … Read more
If I do the following: import subprocess from cStringIO import StringIO subprocess.Popen([‘grep’,’f’],stdout=subprocess.PIPE,stdin=StringIO(‘one\ntwo\nthree\nfour\nfive\nsix\n’)).communicate()[0] I get: Traceback (most recent call last): File “<stdin>”, line 1, in ? File “/build/toolchain/mac32/python-2.4.3/lib/python2.4/subprocess.py”, line 533, in __init__ (p2cread, p2cwrite, File “/build/toolchain/mac32/python-2.4.3/lib/python2.4/subprocess.py”, line 830, in _get_handles p2cread = stdin.fileno() AttributeError: ‘cStringIO.StringI’ object has no attribute ‘fileno’ Apparently a cStringIO.StringIO object doesn’t quack … Read more
I’m trying to do some of the code golf challenges, but they all require the input to be taken from stdin. How do I get that in Python? 2 23
