Category: Openbsd

Categories
Openbsd

Adding color, colour to bash scripts

I was curious about just adding colour to echos that I do in scripts and here is how:

echo -e "This is red->e[00;31mREDe[00m"

 

I havent found out how the colours actually work (eg tables of colours) but if you experiment with the numbers you can come up with different foreground and background colours.

UPDATE:

Ok here is a script to dump out the various colour combos.

#/bin/sh
# Show all the colors of the rainbow, should be run under bash
for STYLE in 0 1 2 3 4 5 6 7; do
  for FG in 30 31 32 33 34 35 36 37; do
    for BG in 40 41 42 43 44 45 46 47; do
      CTRL="33[${STYLE};${FG};${BG}m"
      echo -en "${CTRL}"
      echo -n "${STYLE};${FG};${BG}"
      echo -en "33[0m"
    done
    echo
  done
  echo
done
# Reset
echo -e "33[0m"

 

 

Categories
Openbsd

Creating a memory leak on Linux/Unix

I recently had to create a memory leak to do some testing, here is a snippet of code that I used to create a leak. You can adjust malloc size to allocate more memory, or adjust the usleep to adjust how aggressive it is. the code below on a machine with 500M of memory would chew up about 1% memory a second. Enjoy!

#include <stdlib.h>
#include <unistd.h>

int main(void) {
    /* An infinite loop. */
    while (1) {
       /* Try to allocate some memory. */
       malloc(8386080);
       /* sleep for a bit so its not so aggressive */
       usleep(10000);
    }
    return EXIT_SUCCESS;
}

Categories
Openbsd

wget through proxy tutorial

Ok so I had an issue using wget from the cmd line on my linux box, so here is how to get a proxy to work with wget:

First off export a variable called "http_proxy":

export http_proxy=192.168.1.2

This will try to get to your proxy via port 80, you could also specify like this(if you are on another port):

export http_proxy=192.168.1.2:8080

Then connect specifying your auth creds if you need to pass any:

wget –proxy-user=myusername –proxy-password=mypassword http://www.myserver.com/download/strace-4.5.15-1.el5.x86_64.rpm

 

And you should be good to go!