Difference between revisions of "Linux Tools"

Revision as of 13:49, 17 October 2009

ssh-keygen

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

$ .ssh/id_rsa.pub

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:

1. find all directories whose name does not contain svn
   • find . ! -path "*.svn*" -type d
2. remove .svn folders, e.g. after copying a directory which is a local copy of a subversion repository
   • rm -rvf `find . -name "*.svn"`
3. recursively remove all the .pycs
   • alias rmpyc='rm -vf *.pyc; rm -vf `find . -name *.pyc`
4. remove the pesky .pycs from the repository
   • svn rm `find . -name "*.pyc"`

So is sed:

1. 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"`

test

helo worl