Execute UNIX commands in sequence

The sequence of commands are a must to learn to be effective on the keyboard.

Command 2 (i.e. snappyHexMesh) will start only if command 1 (blockMesh) has succeeded:

blockMesh && snappyHexMesh

Using the colon ; permit to run command in sequence even if the precedent has failed.

blockMesh; snappyHexMesh

Piping commands using |. Feed the output of command 1 in command 2 as argument, as example:

ls | grep foo

where ls list the files/directory in the current directory and grep will retun the a list of file which contain a the pattern foo in their name.