UNIX for Advanced & Expert Users

47 * * * * /usr/bin/run-parts -l /var/log/run-parts.log /etc/cron.d/hourly
40 4 * * * /usr/bin/run-parts -l /var/log/run-parts.log /etc/cron.d/daily
30 4 * * 0 /usr/bin/run-parts -l /var/log/run-parts.log /etc/cron.d/weekly
20 4 1 * * /usr/bin/run-parts -l /var/log/run-parts.log /etc/cron.d/monthly

mkdir -p /etc/cron.d/hourly /etc/cron.d/daily /etc/cron.d/weekly /etc/cron.d/monthly
mkdir -p /var/log

#!/bin/sh
# run-parts:  Runs all the scripts found in a directory.

# keep going when something fails
set +e
# ensure wild card matching
set +f

if [ x"$1" = x"-l" ]; then
  logfile=$2
  shift 2
fi

if [ $# -lt 1 ]; then
  echo "Usage: run-parts [-l logfile] <directory>"
  exit 1
fi

if [ ! -d "$1" ]; then
  echo "Not a directory: $1"
  exit 1
fi

umask 22

if [ -n "$logfile" ]; then
# rotate if >10MB
  [ -f "$logfile" ] && find "$logfile" -size +20000 -exec mv "$logfile" "$logfile.old" \;
  exec >> "$logfile" 2>&1 || exit
fi

# an individual pause:
sleep `cksum /etc/hosts | awk '{print $1'\%'60}'`

# Main loop:
for SCRIPT in "$1"/* ; do
# There are several types of files that we would like to
# ignore automatically, as they are likely to be backups
# of other scripts:
  case $SCRIPT in
  *.bak|*.new|*.old|*.orig|*.swp)
    continue # the loop
    ;;
  *[a-zA-Z0-9])
# The last character is legal :-)
    ;;
  *)
    continue # the loop
    ;;
  esac
# If we've made it this far, then run the script if it's executable:
  if [ -f "$SCRIPT" -a -x "$SCRIPT" ]; then
    echo "`date` run $SCRIPT":
    "$SCRIPT"
    echo
  fi
done

exit 0