Plan 9 from Bell Labs’s /usr/web/sources/patch/applied/install-restructurised/isventi.backup
#!/bin/rc if(! ~ $#* 1){ echo 'usage: isfossil /dev/sdC0/part' >[1=2] exit usage } arg=$1 if(! cmp -s <{dd -quiet 1 -if $arg -bs 1024 -iseek 127 | dd -quiet 1 -bs 13 -count 1} <{echo 'venti config'}) exit noconfig exit 0