Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Can anyone tell me the difference? for example:
if I have a file a.txt with the following content:
a
b
c
what would be the difference between cat a.txt | cat and cat < a.txt
It seems to me that they all simulate STDIN, is that correct, or are there differences? Thanks a lot.
Piping works from one process to another (the
cats in the first example), and hence requires two processes cooperating. Redirection is handled by the shell itself. This can matter when doing things in the shell such as working with variables.