BashScripts.org

It is currently Sat May 25, 2013 5:29 pm

Rediecting or piping text

Board index » Bash Shell Basics » Programming

All times are UTC - 6 hours

Page 1 of 1

[ 9 posts ]

Print view

Previous topic | Next topic

Author

Message

G4143

Posted: Mon Mar 22, 2010 7:23 pm

Joined: Tue Mar 02, 2010 9:55 pm
Posts: 24
Location: Canada

I have this small bash script and it works..When I execute it, it will prompt the user for some text when the user enters some text via the keyboard and hits return the script echoes it back..Simple. Now the question. Is it possible to redirect or pipe text into this script and have it echo the text back..I tried redirection, I tried piping, I tried sending the data to the terminal device directly...it all failed...Is it possible?

Code:

#! /bin/sh

mytty=$(tty)

echo -n "enter a string of text->"
if read mystr<$mytty
then
   echo "text read->'$mystr'"
   exit 0
fi

echo "failed to read->'$mystr'"
exit 1

Top

Watael

Posted: Tue Mar 23, 2010 1:20 am

Joined: Mon Mar 02, 2009 3:03 am
Posts: 448

simply

Code:

#!/bin/bash

while read line; do echo "$line"; done

then

Code:

echo "foo
bar
baz" | ./your_script

Code:

./your_script < <(echo "foo
bar
baz")

Top

DarthWavy

Posted: Tue Mar 23, 2010 3:54 am

Moderator

Joined: Thu Oct 11, 2007 7:12 am
Posts: 212
Location: London - UK

If you need more flexibility than standard pipes will give then try expect;
http://www.manpagez.com/man/1/expect/

Top

G4143

Posted: Tue Mar 23, 2010 5:12 am

Joined: Tue Mar 02, 2010 9:55 pm
Posts: 24
Location: Canada

Watael I think you missed the point. The redirection or piping has to work with the original script that I posted.

Top

G4143

Posted: Tue Mar 23, 2010 5:15 am

Joined: Tue Mar 02, 2010 9:55 pm
Posts: 24
Location: Canada

DarthWavy wrote:

If you need more flexibility than standard pipes will give then try expect;
http://www.manpagez.com/man/1/expect/

I'll look into it..Thanks

Top

thobbs

Posted: Tue Mar 23, 2010 8:34 pm

Joined: Sat Jun 13, 2009 8:53 pm
Posts: 73
Location: Texas!

Quote:

Watael I think you missed the point. The redirection or piping has to work with the original script that I posted.

The tty stuff? I'm not sure what you are asking. If you just use the first script that Watael provided, it will handle anything coming from stdin, whether it's from a redirect, pipe, or user on a terminal. What exactly is missing here?

- thobbs

Top

G4143

Posted: Tue Mar 23, 2010 9:31 pm

Joined: Tue Mar 02, 2010 9:55 pm
Posts: 24
Location: Canada

thobbs wrote:

Quote:

Watael I think you missed the point. The redirection or piping has to work with the original script that I posted.

All I want to know is, is redirection or piping possible with the script I posted? If its possible then how?

Top

thobbs

Posted: Tue Mar 23, 2010 11:30 pm

Joined: Sat Jun 13, 2009 8:53 pm
Posts: 73
Location: Texas!

No, I don't believe so. If you echo $mytty when you try to redirect or pipe in, you'll get "not a tty," as there is no terminal connected to stdin.

- thobbs

Top

G4143

Posted: Wed Mar 24, 2010 5:58 am

Joined: Tue Mar 02, 2010 9:55 pm
Posts: 24
Location: Canada

From the things that I tried I would have to agree with you thobbs...Everyone thanks for the replys

Top

Page 1 of 1

[ 9 posts ]

Board index » Bash Shell Basics » Programming

All times are UTC - 6 hours

Who is online

Users browsing this forum: Exabot [Bot] and 6 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

BashScripts | Promote Your Page Too

Rediecting or piping text

Who is online