Bash Shell Notes

To convert string to integer:

NUM="99"
NUM=$(($NUM+0))

To set environment variables

export VARIABLE=something/etc/environment - Use this file to set up system-wide environment variables.

/etc/profile – Variables set in this file are loaded whenever a bash login shell is entered.

Per-user shell specific configuration files. For example, if you are using Bash, you can declare the variables in the ~/.bashrc

Per-user shell specific configuration files. For example, if you are using Bash, you can declare the variables in the ~/.bashrc:

source ~/.bashrc