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Random FreeBSD Tips
My Wordpress plugin dies with a PHP Fatal error about simplexml_load_string() not existing!
You do not have the port textproc/php5-simplexml installed, which is as easy as
<![CDATA[
cd /usr/ports/textproc/php5-simplexml
make install clean
]]>
How do I delete unprintable characters?
This comes in handy when stripping html or some other text source that may have weird characters.
Sed or Perl is perfect for this task. In Perl you can define a functions
<![CDATA[
sub remove_unprintable { my $s = shift; $s=~s/[^ -~]//g; return $s; }
]]>
and use it like so:
<![CDATA[
my $string_with_bad_chars = `cat /bin/ls`;
$goodstuff = remove_unprintable($string_with_bad_chars);
print $goodstuff;
]]>
To use this from the command line, define a one-liner in your ~/.bashrc file like so:
<![CDATA[
alias remove_unprintable="sed -e 's/[^ -~][^ -~]*//g'"
]]>
Make sure to type
<![CDATA[
source .bashrc
]]>
and your alias is ready to use, and can be used inside unix pipes like:
<![CDATA[
cat /bin/ls | remove_unprintable > some file
]]>
.rar files
To look in .rar files that you downloaded, add the FreeBSD package as root with the pkg_add command
<![CDATA[
# pkg_add -v -r unrar
]]>
Then to expand the contents of a .rar file into the current directory type
<![CDATA[
$ unrar e blah.rar
]]>
How do I mirror a site and ignore that pesky robots.txt file?
You may have found out that wget faithfully listens to robots.txt files which tell bots not to download
certain portions of a website. To get around this try pavuk:
<![CDATA[
# cd /usr/ports/ftp/pavuk
# make install clean
]]>
Now to ignore robots.txt just use the -noRobots command line flag
<![CDATA[
$ pavuk -noRobots http://www.somesite.com
]]>
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