Shell Script Table Post: 302879116

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Top Forums Shell Programming and Scripting Shell Script Table Post 302879116 by Corona688 on Tuesday 10th of December 2013 01:44:20 PM

12-10-2013

Registered User

Standard input and output amount to pre-opened files. Usually, standard input is connected to your keyboard, and standard output is connected to your screen, but the shell lets you attach them to anything you want like this:

Code:

./myscript < inputfile > outputfile

< redirects standard input. Any commands you run in that script, and the read builtin, will read from inputfile instead of the keyboard.

> redirects standard output. Any commands you run, and the echo builtin, will write to outputfile instead of the terminal.

So when they are telling you to read from standard input, they are telling you to just read from the default with read and feed whatever you want into it later.

You use read like

Code:

read VAR1 VAR2 VAR3 VAR4

and if the first line is A B C D E, it effectively does VAR1="A"; VAR2="B" ; VAR3="C" ; VAR4="D E"

And 'standard output' just means 'print to the terminal with echo or whatever'.

We really can't give you a direct answer, we can give you the tools. And this should really be in the homework forum, please re-post there following the homework template.

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LEARN ABOUT MOJAVE

line

line(1)                                                            User Commands                                                           line(1)

NAME

       line - read one line

SYNOPSIS

       line

DESCRIPTION

       The  line utility copies one line (up to and including a new-line) from the standard input and writes it on the standard output. It returns
       an exit status of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal.

EXIT STATUS

       Exit status is:

       0        Successful completion

       >0       End-of-file on input.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+

SEE ALSO

       sh(1), read(2), attributes(5)

SunOS 5.10                                                          1 Feb 1995                                                             line(1)

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