What the difference between shell and environment variable

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Reference no: EM132259913

Questions -

Q1. In a bash shell script, what are the required elements of an "if" control structure?

Q2. In a bash shell script, what are the optional elements of an "if" control structure?

Q3. In a bash shell script, what are the required elements of a "while" control structure?

Q4. What is the difference between a shell variable and environment variable? Which one is considered local and which is considered global?

Q5. List the four kinds of shell parameters/variables.

Q6. Of these four kinds, which kind do $, $_, $#, and $? Belong to?

Q7. What do $, $_, $#, and $? Represent?

Q8. Show the command that creates an alias named hi which lists the hidden files in the current directory.

Q9. Describe the actions that take place when a command ends with

|& file1

For example,

./myscript |& file1

Q10-Q21. Briefly describe the following Linux commands and acronyms.

10. ssh:

11. telnet:

12. traceroute:

13. TCP:

14. LAN:

15. DNS:

16. ftp:

17. ssh:

18. ping:

19. env:

20. g++:

21. gcc:

Q22. Show a command that will create a file named "etc.tar" in your home directory from recursively going through all of the files in the "/etc" directory. In other words, the "etc.tar" file will include the files in the "/etc" directory as well as all of its subdirectories. IMPORTANT: This command must work for any user as well as work from any directory.

Q23. In bash, multiple commands can appear on a single command line when they are separated by certain one to two character control operators. Excluding the newline command initiator, list five other control operators which separate commands.

Q24. Show a single compound command which first changes the permissions on a file named "mychess.conf" in the current directory so that you, your group, and everyone else are limited to read access only; Next, put the file named "mychess.conf" in the "/etc" directory and in the process rename it "chess.conf".

Q25. Show a single compound command which will look for the files "a" and "b" in the current directory, then will print "error: files are missing!" if either file does not exist or will print absolutely nothing if they both exist. Try it out on the command line to check your answer.

Reference no: EM132259913

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