::  Posts  ::  RSS  ::  ◂◂RSS  ::  Contact

fix_path.c

October 9th, 2008
shell, programming, fix_path  [html]
I did end up writing a C program to do the path fixing; it makes a big difference when the system is under load.

fix path in c

Then I have to change my bashrc a little bit from before:

PS1="${PS1}$(fix_path)"
And now it's all spiffy fast.

UPDATE 2009-07-20: The line above actually has an untrusted code excecution vulnerability. If the user can be tricked into navigating to a directory with something like $(foo) or `foo` in the name, then the foo program will be excecuted. This is quite bad. The problem is that the shell evaluates the PS1 variable before display. So we need to change that line to:

PS1="${PS1}\$(fix_path)"
And we postpone evaluation to when the prompt is displayed, instead of evaluating it both when PS1 is set and then again when it is displayed.

Comment via: facebook

Recent posts on blogs I like:

Transfers from Infrequent to Frequent Vehicles

Imagine yourself taking a train somewhere, and imagine the train is big and infrequent. Let’s say it’s the commuter train from New York down the Northeast Corridor to Newark Airport, or perhaps a low-cost OuiGo TGV from Lyon to Paris. Now imagine that you…

via Pedestrian Observations January 20, 2020

Veganism and restrictive eating

I’m reading the book Intuitive Eating, which I highly recommend. I was looking for something like it that could get me back to trusting my biological hunger without worrying that I need to control myself or my weight. It’s raised my consciousness to the w…

via Holly Elmore January 17, 2020

Algorithms interviews: theory vs. practice

When I ask people at trendy big tech companies why algorithms quizzes are mandatory, the most common answer I get is something like "we have so much scale, we can't afford to have someone accidentally write an O(n^2) algorithm and bring the site d…

via Posts on Dan Luu January 5, 2020

more     (via openring)

More Posts:


  ::  Posts  ::  RSS  ::  ◂◂RSS  ::  Contact