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Java, Scala, and everything

Wednesday, September 26, 2012

Get script's own directory in bash script

It was always a problem for me to get the directory the called script is stored in, in the script itself. Thanks to this SO question (http://stackoverflow.com/questions/59895/can-a-bash-script-tell-what-directory-its-stored-in) it's not a problem anymore. As it says:
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
Or, to get the dereferenced path (all directory symlinks resolved), do this:
DIR="$( cd -P "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

Saturday, September 15, 2012

Get specific PC IP from "arp -a"

I want to extract IP of machine leonidas. arp -a returns such line (among others): 
leonidas.home ( at 0:1c:c0:de:8f:28 on en1 ifscope [ethernet] 

To have only IP:
arp -a | grep leonidas | cut -f 2 -d ' ' | sed 's/[()]//g'