How to iterate through an array in bash? one liner

$ export MYARRAY=("one" "two" "three" "four")
$ for i in ${MYARRAY[@]}; do echo $i;done
one
two
three
four

and to reverse the loop



$ for (( idx=${#MYARRAY[@]}-1 ; idx>=0 ; idx-- )) ; do    echo ${MYARRAY[idx]} ; done

How to scroll up using screen in linux

Crtl + a then press ESC to enter copy mode.

You use the mouse wheel to scroll up and down.

Vim Regular Expressions

http://vimregex.com/

Good vimrc resources

Examples of changing spelling highlight modes

http://bodhizazen.net/Tutorials/vimrc


And another resource from Amir Salihefendic http://amix.dk


http://amix.dk/blog/post/19691#The-ultimate-Vim-configuration-on-Github

http://amix.dk/vim/vimrc.html

Yumex Authentication in Openbox

add the next line to your autostart script


(sleep 1 && /usr/libexec/polkit-gnome-authentication-agent-1) &

How to standard input in R?

readline()

how to use empty 'which()' results in R?

As the function returns a vector, for the cases in which the function does not find any cases matching the criteria it will return a vector length of zero

> length(which(borders$end == bands[b,'start']))

[1] 0