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Pointer variable Let's start from the beginning, computer memory location are layered out in addresses, each particular location have an address and holds some kind of content. The address is a numerical number usually in hex for easier expression. To help p...

https://stackoverflow.com/questions/3075130/what-is-the-difference-between-and-regular-expressions

Single Quote Using single quote in bash script will preserve the literal value of each characters in the single quotes. It will not do any variable interpolation but instead treat it as it is. Basically what you entered is what you will see. None of that esca...

Backslash in /regex/ Expression When you are trying to create a literal backslash match in Ruby, if you use the /regex/ expression, the backslash parsing are only done once. Meaning that \\ will become \ string literal. For example: /\\h/ will be matching th...

When using regular expression in find, you have to quote the name parameter to prevent glob expansion (the name expansion done by the shell) find . -name *.java vs find . name "*.java" The first method will expand to the files you have at the current d...

Multi-line Command To execute multi-line command in bash script simple put a \ after breaking up your commands. There should be no white spaces after the backslash, else it will fail! Every single line should be followed by a \ until you finished typing the ...