I need help with these command:

5 Redirection

Through redirection (>), you can take the output of a program and have it automatically sent to a file.

Example: ls lsa > dump.txt

To append additional data to an existing file use two > symbols (>>).

6 Multiple Commands

Under BASH, multiple commands can be executed on the same line by separating the commands with semicolons (;). Since the shell is also a programming language, you can run command serially only if the first command succeeds. Try && command to experiment with two commands by switching their position.

7 Documentation Tools

man

info

8 Files Change Mode: chmod

Letter Permission Value

r Read 4

w Write 2

x Execute 1

The following list shows the most common combinations of the three permissions:

Letter Permission Value

--- No permission 0

r-- Read only 4

rw- Read and write 6

rwx Read, write, and execute 7

r-x Read and execute 5

--x Execute only 1