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Visualización de archivos comprimidos con zcat
Resulta común configurar logrotate para comprimir los ficheros de log para almacenarlos. Mediante zcat podemos visualizarlos sin descomprimirlos previamente.
Por ejemplo, usando estos ficheros:
# ls messages* messages messages.1.gz messages.2.gz messages.3.gz messages.4.gz
Usamos zcat con los ficheros comprimidos:
# zcat messages.1.gz Mar 8 05:53:46 shuVak freshclam[2091]: Received signal: wake up Mar 8 05:53:46 shuVak freshclam[2091]: ClamAV update process started at Sun Mar 8 05:53:46 2009 Mar 8 05:53:46 shuVak freshclam[2091]: main.cld is up to date (version: 50, sigs: 500667, f-level: 38, builder: sven) Mar 8 05:53:46 shuVak freshclam[2091]: daily.cld is up to date (version: 9080, sigs: 14111, f-level: 38, builder: neo) Mar 8 05:53:46 shuVak freshclam[2091]: --------------------------------------
zcat sería equivalente a usar el comando gzip o gunzip con la opción -c:
# gzip -dc messages.1.gz Mar 8 05:53:46 shuVak freshclam[2091]: Received signal: wake up Mar 8 05:53:46 shuVak freshclam[2091]: ClamAV update process started at Sun Mar 8 05:53:46 2009 Mar 8 05:53:46 shuVak freshclam[2091]: main.cld is up to date (version: 50, sigs: 500667, f-level: 38, builder: sven) Mar 8 05:53:46 shuVak freshclam[2091]: daily.cld is up to date (version: 9080, sigs: 14111, f-level: 38, builder: neo) Mar 8 05:53:46 shuVak freshclam[2091]: --------------------------------------
En el caso de gunzip nos ahorramos la opción -d:
# gunzip -c messages.1.gz Mar 8 05:53:46 shuVak freshclam[2091]: Received signal: wake up Mar 8 05:53:46 shuVak freshclam[2091]: ClamAV update process started at Sun Mar 8 05:53:46 2009 Mar 8 05:53:46 shuVak freshclam[2091]: main.cld is up to date (version: 50, sigs: 500667, f-level: 38, builder: sven) Mar 8 05:53:46 shuVak freshclam[2091]: daily.cld is up to date (version: 9080, sigs: 14111, f-level: 38, builder: neo) Mar 8 05:53:46 shuVak freshclam[2091]: --------------------------------------
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