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# ssh myremoteserver.net 'df -k'
Filesystem         1024-blocks   Used  Available Capacity Mounted on
/dev/sda3            17092820  2255644  13954808     14%   /
/dev/sdb4            30639063 11498971  17533191     40%   /home

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    system("ssh", "-l", "root", "df -k") == 0
        or die "Couldn't run command";