Send data to running shell script

Question

I have continuously running script that waits for input and prints 'Wait for input' every 15 seconds to stdout. I need to emulate action of pasting list of IP addresses in stdin while script is running. For example manually i need to do these steps: copy list below including new line after last list element and paste it directly into stdin.

127.0.0.1
127.0.0.2
127.0.0.3

I've tried using pipes and redirections (with both \n and \r) from file with no luck

echo "127.0.0.1\n127.0.0.2\n" | script

or

script < file

where file contain same ip addresses. Any suggestions?

Please add the script to your question.

Dennis Williamson
– Dennis Williamson

2012-06-11 13:16:10 +00:00
Commented Jun 11, 2012 at 13:16 — Dennis Williamson
– Dennis Williamson, Commented Jun 11, 2012 at 13:16
What unix is that? Is there a /proc available?

ott--
– ott--

2012-06-11 13:17:12 +00:00
Commented Jun 11, 2012 at 13:17 — ott--
– ott--, Commented Jun 11, 2012 at 13:17

Eugen Rieck · Accepted Answer · 2012-06-11 13:21:55Z

2

Use a FIFO!

mkfifo /path/to/tmp.fifo
tail -f /path/to/tmp.fifo | script

Now whenever you send something to the fifo (from another TTY, from a process, whatever), it will be as if you typed into the waiting script, e.g.

echo "127.0.0.1" >> /path/to/tmp.fifo

answered Jun 11, 2012 at 13:21

Eugen Rieck

65.6k10 gold badges76 silver badges97 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

William Pursell · Accepted Answer · 2012-06-11 15:25:27Z

0

Use cat. If you execute:

cat | script

you can cut-n-paste or type into the tty.

answered Jun 11, 2012 at 15:25

William Pursell

214k49 gold badges279 silver badges317 bronze badges

Collectives™ on Stack Overflow

Send data to running shell script

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related