Plan 9 is a Unix-like operating system, written at Bell Labs in the late '80s. The two main ideas behind the design of the OS are private namespaces: every process has an independent view of the file tree, and file interfaces: everything in plan9 can be accessed through a file. Based on these two premises the system appears to be very awkward at first, as in different from anything else, but also very coherent and easy to predict, once you get the hang of it. It was born as a research operating system and as such it doesn't not strive to be a product.
I'm still experimenting with it, but I find it very interesting and amusing to use especially because it lacks a 'modern' browser and all the distractions it brings.
Resources
- Cat -v (not only plan9 related stuff)
- The fork I'm using
- Many useful tips
Rename
Conveniently rename files. I basically use this to remove whitespace and other weird characters from file names
#!/bin/rc
# usage: rename file pattern
if(! ~ $#* 2){
echo 'usage: rename file pattern' >[1=2]
exit 'error'
}
new_name=`{echo $1 | sed $2}
mv $1 $new_name
Balance
I keep my balance in a simple greppable™ text file ($home/lib/balance).
File format:
date;amount;tag1 tag2 tag3
Money spent is considered negative. To compute the total balance:
#!/bin/awk -F; -f
BEGIN{s=0}
{s+=($2-0)}
END{print s}
e.g.:
% balance/tot < lib/balance
-10000
To compute the total of all entries matching a pattern:
#!/bin/rc
fn Search{
awk -F';' -v 's=0' 'BEGIN{} /'$1'/ {print $2, $3 ; s+=($2-0)}
END{print s}'
}
Search $1
e.g. to compute how much I spent on stuff:
% balance/s stuff < lib/balance
-100 stuff home
-10000 stuff unneeded
-10100
