OSX

• To add a directory to $PATH (or edit other environmental variables):

edit ~/.bash_profile

• To run bash_profile:

source ~/.bash_profile

if bash_profile doesn't exist - create one. Sample (working) bash_profile content:

export PATH="$PATH:/Users/andrii/software/apache-tomcat-9.0.10/bin"

• To find folder size

cd folderName

du -hs

• To compare contents of two folders recursively:

• diff -rq folderA folderB

rq: r tells it to scan resucrively

q tells it "quick" - do not display line-by-line differences

• To compare two text files' contents:

wdiff -s a.txt b.txt

• To install wdiff:

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null

and press enter/return key. Wait for the command to finish.

Run:

brew install wdiff

• • To extract a jar file:

jar xf filename.jar

• To display directory tree:

tree