in order to installing MadGraph,which is a physicist app showing Feynmman digrams for production of particles, I have download a version,then I have try to untar it using
$ tar zxvf MG5_aMC_v2.7.0.tar.gz
my working directory shows:
tar (child): MG5_aMC_v2.7.0.tar.gz : open impossible: Aucun fichier ou dossier de ce type
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now
any help, please
tar xvf [path to directory with]/MG5_aMC_v2.7.0.tar.gz
pwd
command.) ... Then dotar xvf ../Downloads/ MG5_aMC_v2.7.0.tar.gz
... i.e. if your MG5 package is located inDownloads/