Solved

BusyBox doesn't seem to be parsing input

Posted on 2013-11-10
7
398 Views
Last Modified: 2013-12-09
Hi,

I have an embedded Linux system and I cant seem to get busybox to parse input. I have

ttyS0::respawn:-/bin/sh

in my inittab file, but after the system boots all it seems to do is echo my input, rather than parsing it with busybox(/bin/sh).

eg.

I send "ls" to the serial console and all I get back is "ls" rather than a directory listing.

Any input would be appreciated.

Thanks in advance.
0
Comment
Question by:sean-keys
  • 4
  • 3
7 Comments
 
LVL 21

Expert Comment

by:Mazdajai
ID: 39639166
Are the commands listed in the bin directory? Try cd and run in the absolute directory or consult the vendor.

Sometimes not all the commands are available in an embedded Linux environment.
0
 

Author Comment

by:sean-keys
ID: 39640130
I cant "cd".  If i type "cd" and hit return it will just echo "cd" back in my face without really running "cd". See what I mean?
0
 
LVL 21

Expert Comment

by:Mazdajai
ID: 39640301
Do you have the correct baud-rate, connection setting?
0
Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

 

Author Comment

by:sean-keys
ID: 39640318
oh yeah, the strings that get dumped to the serial console are correct
0
 
LVL 21

Expert Comment

by:Mazdajai
ID: 39640324
If you are certain the connection setting is correct. I would check with the vendor. This sounds like a locked down version of busybox.
0
 

Accepted Solution

by:
sean-keys earned 0 total points
ID: 39696246
The problem lied within an application that was forking and hijacking the tty that's connected to the serial port.

Sorry guys, a problem that would be very difficult to spot for anyone not connected to that device.
0
 

Author Closing Comment

by:sean-keys
ID: 39705706
It would have been overly difficult for a third party to diagnose this one.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
ignore other .htaccess 2 69
linux - yum package installation issue 2 106
Apache module 5 60
Install XRDP on Ubuntu Server 16.10 x64 3 56
I am a long time windows user and for me it is normal to have spaces in directory and file names. Changing to Linux I found myself frustrated when I moved my windows data over to my new Linux computer. The problem occurs when at the command line.…
The purpose of this article is to demonstrate how we can use conditional statements using Python.
Connecting to an Amazon Linux EC2 Instance from Windows Using PuTTY.
Get a first impression of how PRTG looks and learn how it works.   This video is a short introduction to PRTG, as an initial overview or as a quick start for new PRTG users.

713 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question