BASH SHELL : colors & watch command

DeM Zed

Hi,

I use watch command to execute a monitoring script "probe.sh"

probe uses colors like this one
echo -e "\e[5;31mWARNING\e[0m"

This is correctly printed using probe.sh, but not while using "watch
rpobe.sh".

Any idea ?

Thanks !

Chris F.A. Johnson

On 2007-11-16, DeM Zed wrote:
>
>
> Hi,
>
> I use watch command to execute a monitoring script "probe.sh"
>
> probe uses colors like this one
> echo -e "\e[5;31mWARNING\e[0m"
>
> This is correctly printed using probe.sh, but not while using "watch
> rpobe.sh".

man watch:

BUGS
...
Non-printing characters are stripped from program output. Use
"cat -v" as part of the command pipeline if you want to see
them.



--
Chris F.A. Johnson, author | <http://cfaj.freeshell.org>
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence

DeM Zed

I don't understand this cat -v.
Can you show me an example ?

On 16 nov, 23:38, "Chris F.A. Johnson" <> wrote:

> manwatch:
>
> BUGS
> ...
> Non-printing characters are stripped from program output. Use
> "cat -v" as part of thecommandpipeline if you want to see
> them.
>

Chris F.A. Johnson

On 2007-11-19, DeM Zed wrote:
> On 16 nov, 23:38, "Chris F.A. Johnson" <> wrote:
>
>> man watch:
>>
>> BUGS
>> ...
>> Non-printing characters are stripped from program output. Use
>> "cat -v" as part of the command pipeline if you want to see
>> them.
>>

[please don't top post]

> I don't understand this cat -v.

It is non-standard. See this excerpt from the POSIX spec:

Historical versions of the cat utility include the options -e,
-t, and -v, which permit the ends of lines, <tab>s, and
invisible characters, respectively, to be rendered visible in
the output.

--
Chris F.A. Johnson, author | <http://cfaj.freeshell.org>
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence

DeM Zed

I don't understand this cat -v.
Can you show me an example ?

On 16 nov, 23:38, "Chris F.A. Johnson" <> wrote:

> manwatch:
>
> BUGS
> ...
> Non-printing characters are stripped from program output. Use
> "cat -v" as part of thecommandpipeline if you want to see
> them.
>

Chris F.A. Johnson

On 2007-11-19, DeM Zed wrote:
> On 16 nov, 23:38, "Chris F.A. Johnson" <> wrote:
>
>> man watch:
>>
>> BUGS
>> ...
>> Non-printing characters are stripped from program output. Use
>> "cat -v" as part of the command pipeline if you want to see
>> them.
>>

[please don't top post]

> I don't understand this cat -v.

It is non-standard. See this excerpt from the POSIX spec:

Historical versions of the cat utility include the options -e,
-t, and -v, which permit the ends of lines, <tab>s, and
invisible characters, respectively, to be rendered visible in
the output.

--
Chris F.A. Johnson, author | <http://cfaj.freeshell.org>
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence