To be able to ssh to another machine without needing to type your passwd:
Generate keys: $ ssh-keygen -t rsa -b 1024
Use the default file name and empty pass phrase for password less authentication. This will generate keys in
Then secure shell copy to another host as authorized_keys
$ scp ~/.ssh/id_rsa.pub <machine name>:~/.ssh/authorized_keys
Instructions copied from: http://pr.willowgarage.com/wiki/GB_ssh-keygen
Additional keys can be named authorized_keys2 and so on.
command line tools: find, sed etc.
The find command is pretty nifty:
- find all directories whose name does not contain svn
- find . ! -path "*.svn*" -type d
- remove .svn folders, e.g. after copying a directory which is a local copy of a subversion repository
- rm -rvf `find . -name "*.svn"`
- recursively remove all the .pycs
- alias rmpyc='rm -vf *.pyc; rm -vf `find . -name *.pyc`'
- remove the pesky .pycs from the repository
- svn rm `find . -name "*.pyc"`
So is sed:
- replace update_path with load_manifest. (-i is doing an in-place replace, I believe)
- sed -i 's/update_path/load_manifest/' `find . -name "*.py"`
udev for persistent device naming
Steps in brief
- sudo lsusb -v >pre # with device being unplugged
- sudo lsusb -v >post # with device being plugged in
- diff pre post (or use meld for a nicer graphical tool for comparing files) # you can read the Serial Number on the line "iSerial" etc.
- Now edit the udev rules in /etc/udev/rules.d/10-ROBOT.rules
- sudo /etc/init.d/udev restart
- ls /dev/robot -- to check whether the devices appear.
- detailed info about writing udev rules: http://www.reactivated.net/writing_udev_rules.html