daily

来自「minix操作系统最新版本（3.1.1）的源代码」· 代码 · 共 72 行

#!/bin/sh
#
# daily - daily cleanup of the system.

# Doesn't make sense when running from CD
if [ -f /CD ]
then	exit
fi

case "$#:$1" in
1:cron|1:boot)
    caller=$1
    ;;
*)  echo >&2 "Usage: $0 cron|boot"
    exit 1
esac

test -d /usr/adm || exit
cd /usr/adm || exit

# Last run must have been on a previous day.
timestamp=daily.lasttime
if test -f $timestamp
then
    set -- `ls -lT $timestamp`
    test "$6 $7 $9" = "$(date '+%b %d %Y')" && exit
fi
>$timestamp

# Remove three day old files from various tmp dirs.
cleantmp -3 /tmp /usr/tmp /usr/preserve /usr/spool/lpd /usr/spool/at/past

# Truncate log files in /usr/adm.
test -d old || mkdir old || exit

cycle()
{
    # Cycle a log file if larger than a size in kilobytes.
    local size="`expr "$1" + "$1"`"
    local log="$2"

    if test -f "$log" && test -n "$(find "$log" -size +"$size")"
    then
	test -f "old/$log.2" && cp -p "old/$log.2" "old/$log.3"
	test -f "old/$log.1" && cp -p "old/$log.1" "old/$log.2"
	cp -p "$log" "old/$log.1"
	: > "$log"
    fi
}

cycle 100 wtmp 
cycle 100 log 
cycle  20 ftplog
cycle 200 aftplog

# Make copies of /etc/passwd and /etc/shadow if they have been changed.
for file in passwd shadow
do
    if cmp -s /etc/$file old/$file.1
    then
	# Fine.
    else
	test -f old/$file.2 && cp -p old/$file.2 old/$file.3
	test -f old/$file.1 && cp -p old/$file.1 old/$file.2
	test -f /etc/$file && cp -p /etc/$file old/$file.1
    fi
done

# Continue with a local script if present.
test -f /usr/local/etc/daily && sh /usr/local/etc/daily $caller
exit 0