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Full Discussion: Shell Script Table
Top Forums Shell Programming and Scripting Shell Script Table Post 302879116 by Corona688 on Tuesday 10th of December 2013 01:44:20 PM
Old 12-10-2013
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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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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