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From: "Tiago Barcellos Peczenyj" <address@hidden>
Subject: Re: [shell-script] Re: Verificar arquivo na Internet
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Q tal usar o curl para fazer um head ?
URL=3Dwww.google.com.br/intl/pt-BR_br/images/logo.gif
curl -sI ${URL} | sed -n '/Last-Modified: */{ s///; p }'
Wed, 07 Jun 2006 19:50:30 GMT
calculando o timestamp:
DATE=3D$( curl -sI ${URL} | sed -n '/Last-Modified: */{ s///; p }' )
date -d "${DATE}" +"%s"
1149709830
Ou ent=E3o baixa o arquivo e compara o md5sum
2008/2/22 mop <address@hidden>:
> Boa Fernando!!!
>
> Para o caso de um m=EDsero sistema, s=F3 com shell, uma solu=E7=E3o 100%=
bash, desde
> que este tenha sido compilado com suporte a tcp:
>
> exec 3<>/dev/tcp/www.google.com.br/80
> D=3D;echo -e "HEAD /intl/pt-BR_br/images/logo.gif HTTP/1.1\r\n\r\n" >&3
> while read -t9 L;do [ ${L%% *} =3D=3D Last-Modified: ]&&D=3D${L#* }&&bre=
ak;done<&3
> exec 3<&-
>
> Sorry, I am a shell fan! :)
>
> Caso a data no download n=E3o esteja sendo preservada, =E9 poss=EDvel in=
serir no
> script uma linha com:
> touch -d "$D" file
>
> Da=ED a cada checagem =E9 s=F3 verificar se $D =E9 igual a:
> date -r file
>
>
> ------------------------------------------------------------------
> >From: Fernando Lemes da Silva
>
> >
> >Vamos supor que voce baixe o arquivo e anote a data e hora dele no serv=
idor
> >remoto. Para saber se o arquivo foi modificado basta comparar a data.. =
algo
> >como:
> >
> >(echo -e "HEAD www.google.com.br/intl/pt-BR_br/images/logo.gif
> >HTTP/1.1
> >Host: www.google.com.br
>
> >
> "; sleep 3) |
> >nc www.google.com.br 80 |
> >grep "Last-Modified:"
> >
> >Isto ir=E1 pegar o header "Last-Modified" da requisi=E7=E3o... logo voc=
e saber=E1
> >quando o arquivo mudar. Espero que lhe ajude.
>
>
>
>
> ---------------------------------------------------------------------
> Esta lista n=E3o admite a abordagem de outras liguagens de programa=E7=
=E3o, como perl, C etc. Quem insistir em n=E3o seguir esta regra ser=E1 mod=
erado sem pr=E9vio aviso.
> ---------------------------------------------------------------------
> Sair da lista: address@hidden
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> address@hidden
>
>
>
--=20
Tiago B Peczenyj
Linux User #405772
http://peczenyj.blogspot.com/
"what does not kill us makes us stronger"
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