Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/lib/dist/pc/inst/isext2
#!/bin/rc if(! ~ $#* 1) { echo 'usage: isext2 /dev/sdC0/part' >[1=2] exit usage } cmp -s <{dd -if $1 -bs 1 -count 2 -skip 1080 >[2]/dev/null | xd -b |sed 1q} \ <{echo '0000000 53 ef'} exit $status