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Expect scripts

crontab

*    *   *   *    *  command to be executed
-    -    -    -    -
|     |     |     |     |
|     |     |     |     +----- day of week (0 - 6) (Sunday=0)
|     |     |     +------- month (1 - 12)
|     |     +--------- day of month (1 - 31)
|     +----------- hour (0 - 23)
+------------- min (0 - 59)

IO redirection

http://linuxreviews.org/beginner/abs-guide/en/c12753.html∞

grepping multiple strings

grep -e "string1" -e "string2" $INFILE

Testing regex

cat << end|perl -e 'while (<>) { $blah .= $_ }; $blah =~ s/REGEXP/\1/g; print $blah;'

DST fix

DST fix verification

zdump -v <timezone> | grep 2007

If your systems's zoneinfo files are up to date, you'll get output showing DST changes on March 11 and November 4, eg:

$ zdump -v EST5EDT | grep 2007
EST5EDT Tue Mar 6 13:59:24 2007 UTC = Tue Mar 6 08:59:24 2007 EST isdst=0
EST5EDT Sun Mar 11 06:59:59 2007 UTC = Sun Mar 11 01:59:59 2007 EST isdst=0
EST5EDT Sun Mar 11 07:00:00 2007 UTC = Sun Mar 11 03:00:00 2007 EDT isdst=1
EST5EDT Sun Nov 4 05:59:59 2007 UTC = Sun Nov 4 01:59:59 2007 EDT isdst=1
EST5EDT Sun Nov 4 06:00:00 2007 UTC = Sun Nov 4 01:00:00 2007 EST isdst=0

tcpserver problem

If you see this error

@40000000478326f0206cc9f4 tcpserver: fatal: temporarily unable to figure out IP address for 0.0.0.0: file does not exist

Do this and it fixes it instantly. Stupid FreeBSD, don't ask me why

touch /etc/dnsrewrite

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