lcd4linux-users

[lcd4linux] Pipes in exec

[Fabian R. <na...@go...>]

Hello there!

I wanna know if its possible to use piped commands in an exec's
expression? Cause if so I didnt get it working...

So long,
Fabian

Re: [lcd4linux] Pipes in exec

[Michael R. <mi...@re...>]

Hi Fabian!

> I wanna know if its possible to use piped commands in an exec's
> expression? Cause if so I didnt get it working...

I'm not sure if I understand what you are trying to do... could you 
please provide an example?


bye, Michael

-- 
Michael Reinelt <mi...@re...>
http://home.pages.at/reinelt
GPG-Key 0xDF13BA50
ICQ #288386781

Re: [lcd4linux] Pipes in exec

[Fabian R. <na...@go...>]

Am Wed, 02 Jan 2008 07:29:02 +0100
schrieb Michael Reinelt <mi...@re...>:

> I'm not sure if I understand what you are trying to do... could you=20
> please provide an example?
>=20
>=20
Something like that Michael:

grep Title /tmp/xmms-info | sed -e s/Title:\ //g | sed -e s/^.*\ \-\ //g

or

grep Title /tmp/xmms-info | gawk -F": " '{ print $2}' | gawk -F" - "
'{ print $1}'

So long,
Fabian

Re: [lcd4linux] Pipes in exec

[Ernst B. <e.b...@xe...>]

On Mittwoch, 2. Januar 2008, Fabian Richter wrote:
> Am Wed, 02 Jan 2008 07:29:02 +0100
>
> schrieb Michael Reinelt <mi...@re...>:
> > I'm not sure if I understand what you are trying to do... could you
> > please provide an example?
>
> Something like that Michael:
>
> grep Title /tmp/xmms-info | sed -e s/Title:\ //g | sed -e s/^.*\ \-\ //g
>
> or
>
> grep Title /tmp/xmms-info | gawk -F": " '{ print $2}' | gawk -F" - "
> '{ print $1}'
>

The pipe syntax is usually provided by the shell, so you can probably get it 
to work by calling /bin/sh directly and giving your little script as argument 
to the -c option:

/bin/bash -c 'grep Title /tmp/xmms-info | gawk ... |'

Need to be carefull about single tics inside the command, and keep in mind 
that a shell invocation can slow things down quite a bit, depending on the 
config files it has to parse (~/.bashrc, .profile and the like)

HTH
/Ernst

Re: [lcd4linux] Pipes in exec

[Fabian R. <na...@go...>]

Am Wed, 2 Jan 2008 21:41:09 +0100
schrieb Ernst Bachmann <e.b...@xe...>:

> The pipe syntax is usually provided by the shell, so you can probably
> get it to work by calling /bin/sh directly and giving your little
> script as argument to the -c option:
>=20
> /bin/bash -c 'grep Title /tmp/xmms-info | gawk ... |'
>=20
Didnt work either :(

Isnt the correct exec syntax like: exec('command', 300); ? Because if
you cant disregard the ' I cant think of a way to make it still work
with providing my command via the -c option :/

So long