dumpvacroots

这是一个同样来自贝尔实验室的和UNIX有着渊源的操作系统, 其简洁的设计和实现易于我们学习和理解

#!/bin/rc

# this dumps all the vac scores ever stored to the venti server
# if nothing else, this illustrates that you have to control access
# to the physical disks storing the archive!

ventihttp=`{echo $venti | sed 's/^[a-z]+!([0-9\.]+)![a-z0-9]+$/\1/; s/^[a-z]+!([0-9\.]+)/\1/; s/$/:8000/'}

hget http://$ventihttp/index | 
awk '
 /^index=/ { blockSize=0+substr($3, 11); }
 /^arena=/ { arena=substr($1, 7); }
 /^	arena=/ { start=0+substr($5, 2)-blockSize; printf("venti/printarena -o %d %s\n", start, $3); }' |
rc |
sed -n 's/^(.*) 1$/vac:\1/p'