User:Drue

test some more - this is a rubot test

Homebrew

• /homebrew notes

Links

• text mockup
• Rosetta Stone for Unix

xterm

• FreeBSD: "xterm -j -s +sb -sl 1000 -ls -geom 80x25 -bg black -fg green -cr orange -ms orange -hc darkblue -fa "clean*" -fs 11"
• Linux: Use -fs 9

Changing a user's UID

• manually change the UID using vipw (note the old UID)
• change the user's GID to match in /etc/group (note the old GID)

The tricky part, then, is changing a user's files. This ought to do the trick:

find / -user oldUID -print | xargs chown newUID
find / -group oldGID -print | xargs chgrp newGID

FreeBSD Ports Index

• When you need to rebuild FreeBSD's Ports Index

cd /usr/ports
make fetchindex
portsdb -u

Find Commands

• Basic Syntax

find / -name \*.fo\? -exec ls -l {} \;

• Chmod has a +X option which will give dirs x but not files. I wanted the same thing for read, like a +R - here's a command that will do it. It will give directories read access but not any files.

find . -type d -print0 | xargs -0 chmod a+r

scp script

• Scp with sh example

#!/bin/sh
for file in `ls *.jpg`
do
    scp $file tiger:~/bleh/ && rm $file
done

Bash

• To rename all files in current dir without .dist extension (i think this only works in bash):

for foo in *.dist; do cp $foo `basename $foo .dist`; done

• More complicated example

for z in *; do echo -n $z | sed 's/_/ /g' | perl -e '$_ = <>; chomp; print;' | xargs -0 mv $z; done

Serial

• To connect to a serial device.

cu -s 9600 -l /dev/cuaa0 (or 38400)
## OR ##
screen /dev/cuaa0 9600 vt100

• Or using kermit:

drue@thermite:~$ cat .kermrc
set line /dev/cua00
set speed 9600
set flow-control none
connect
drue@thermite:~$ kermit

Postfix + FreeBSD

• Aliases with postfix in freebsd:

In main.cf:

alias_maps = hash:/etc/mail/aliases
alias_database = hash:/etc/mail/aliases

Then, newaliases to regenerate alias db.

Command Line Perl

• To make a change to all files in a dir

perl -pi -e 's/one/two/g' *.html

• recursively

find . | grep php | grep -v svn | xargs perl -pi -e 's/\$DOCUMENT_ROOT/\$\{_SERVER\[\"DOCUMENT_ROOT\"\]\}/g;'

• Or how about setting the contents of everythign to lowercase

perl -pi -e 's/[a-z]/[A-Z]/' *

• This sets filenames in current directory to lowercase

for x in *; do echo -n $x | tr A-Z a-z | xargs mv $x; done

FreeBSD Commands

• What's listening?

sockstat -4

Apache Tips

• Apache truncating dir listings fix:

12:43PM <bilbo_work> Guys, patch this in all your httpd.conf's...  Search for
          "IndexOptions FancyIndexing" and add a line after it that reads:
12:43PM <bilbo_work>     IndexOptions NameWidth=*

Cron Tips (freebsd)

• Cron doesn't have a year option, nor is it possible to do, for instance, "first wednesday of the month". But, using date, you can do this:
  • 0 0 * 9 * if [ `date "+\%Y"` != 2007 ]; then exit; fi; echo "This will execute every day of september in 2007."

Using Screen

Labeling Screens: In screen, ctrl-a :sessionname foobar Or start screen using -S and/or -t.