Category: Unix Notes

macosxhints.com – Modify cursor movement keys in Terminal

The defacto standard in Terminal’s shells is meta-b (backward) and meta-f (forward) for word-by-word movement. In every other Cocoa app, however, it’s Option-left arrow and Option-right arrow. I wanted Terminal to behave the same way.

from your terminal

man ipfw

the command to deny/drop packets for a host is simply

sudo ipfw add drop src-ip 217.59.146.158

which can be seen to be effective by doing this

teatime 5 # sudo ipfw show

get last month using bash and the date command

MON=`date +”%m”`
((MON=$MON-1))
-bash: ((: MON=09: value too great for base (error token is “09”)

So, do this

MON=`date +”10#%m”`
((MON=$MON-1))
echo $MON
8

How entertaining – bash treats the leading zero as an indicator of octal.

Same would need to be done for any of the `date` formats that return leading zero as part of the result.

to get the seconds since EPOCH for other reasons –

date -r $((`date ‘+%s’` – 86400))

This version has no problem with the boundary condition of month number 1

MYDATE=`date +”%Y%m”`
YEAR=${MYDATE:0:4}
MONTH=$((10#${MYDATE:4:2} – 1))
[[ $MONTH == 0 ]] && MONTH=12 && ((YEAR–))

theReport=Web-Report-Monthly-$YEAR-$MONTH.html

macosxhints – 10.3: Create Postfix mail user aliases

Now you should edit the /etc/aliases file. Using your favorite editor (mine is vi), edit the file:
sudo vi /etc/aliases

Aliases are rather simple to set up. You should add any aliases that you want under the heading: # Put your local aliases here. If you want to alias foo so that it is delivered to Bob’s account (bob), then you would do the following:
foo: bob

You can add as many aliases as you want for a person. When you are done, you MUST run the following command for Postfix to load the aliases (starting and stopping Postfix will NOT reload the aliases file):
sudo newaliases

mailq