updatedb

<B>Digital的Unix操作系统VAX 4.2源码</B>

#!/bin/csh -f
#
#	@(#)updatedb.csh	4.4	(Berkeley)	83/07/21
#
set SRCHPATHS = "/"			# directories to be put in the database
set LIBDIR = /usr/lib/find		# for subprograms
set FINDHONCHO = root			# for error messages
set FCODES = /usr/lib/find/find.codes	# the database 

set path = ( $LIBDIR /usr/ucb /bin /usr/bin )
set bigrams = /tmp/f.bigrams$$
set filelist = /tmp/f.list$$
set errs = /tmp/f.errs$$

# Make a file list and compute common bigrams.
# Alphabetize '/' before any other char with 'tr'.
# If the system is very short of sort space, 'bigram' can be made
# smarter to accumulate common bigrams directly without sorting
# ('awk', with its associative memory capacity, can do this in several
# lines, but is too slow, and runs out of string space on small machines).

nice +10
find ${SRCHPATHS} -print | tr '/' '\001' | \
   (sort -f; echo $status > $errs) | \
   tr '\001' '/' | tee $filelist | $LIBDIR/bigram | \
   (sort; echo $status >> $errs) | uniq -c | sort -nr | \
   awk '{ if (NR <= 128) print $2 }' | tr -d '\012' > $bigrams

# code the file list

if { grep -s -v 0 $errs } then
	echo 'squeeze error: out of sort space' | mail $FINDHONCHO
else
	$LIBDIR/code $bigrams < $filelist > $FCODES
	rm $bigrams $filelist $errs
endif