[SOLVED] Script execution called by a script with /dev/ttyUSB0 access problem

[Daniel]

Hi,

I've got scripts to on/off backlight.
The commands pass with /dev/ttyUSB0 access
Command example:
 

Code: [Select]

echo -ne "B255\r" > /dev/ttyUSB0
It runs ok when script is executed directly : backlight ON / OFF ok.

When i call one script from an other script, no change on backlight !

I'm root!

I'm thinking about environment variables ... but ?

Thanks
Daniel.

[Daniel]

Script and application are launched in sh.

Adding #!/bin/bash at the beginning of the script make it runs!

In fact, bash is default : the reason because script direct execution is ok.

Daniel.

[tinypoodle]

It is simply wrong to declare scripts containing bashisms as #!/bin/sh

[Daniel]

I've got big scripts in sh ... no time to convert and test them now

New scripts are written with bash  

Thanks
daniel.

[tinypoodle]

New scripts are written with bash 

Umm... It would be equally wrong to declare POSIX shell compatible scripts as #!/bin/bash   

[Daniel]

Then, what is the best thing to do ?

D.

[curaga]

Umm... It would be equally wrong to declare POSIX shell compatible scripts as #!/bin/bash   

How's that? Bash is posix compatible, so it's merely resource overhead.

[tinypoodle]

Then, what is the best thing to do ?

D.

Declare only those scripts which contain bashisms as #!/bin/bash

[tinypoodle]

Umm... It would be equally wrong to declare POSIX shell compatible scripts as #!/bin/bash   

How's that? Bash is posix compatible, so it's merely resource overhead.

bash can run in POSIX compatibility mode [which it doesn't when invoked by #!/bin/bash - but that's beside the point here], but declaring POSIX shell compatible scripts as #!/bin/bash unnecessarily reduces compatibility/portability

[Daniel]

I've got big scripts in sh ... no time to convert and test them now

I said convert sh script in bash, not replace sh with bash!


hum ... now, my script is functionning : what i wanted.
And i know why

Thanks
daniel.

[tinypoodle]

I said convert sh script in bash, not replace sh with bash!

There seems to be a language barrier issue making communication difficult   

[Daniel]

eternal communication problem between men!
 
lol

D.