CMIT 391
Name:___________________________


Get the combos.cpp file from:
wget http://sensei.asia.umuc.edu/dwills/cmis160/Programs/combos.cpp

Compile it with g++ to 'combos'
Run it, input 5 and 3 as the n and r values.
Run it with 5 and 3 as its command line arguments.  
Run it with 10 and 5 as its command line arguments.  
   piping that into wc,  how many combinations are there: _________
   piping into head, what is the first output:________
   piping into tail, what is the last output: ________
   piping into sort and head/tail what are the first and last in
       sorted order:_________   __________

Using ldd, what libraries does this program use:
_________________


Download the ANSI terminal control example programs and compile and run them.
What libraries do these programs use that combos does not: ___________

Download the Curses example programs and compile and run them.
What libraries do these programs use that combos does not: ___________

Which programs in /bin use curses:________________
Hint: for loop useful here.  use ldd and grep in pipeline

Download the Xlib example program and compile and run it.
What libraries does this program use that combos does not: ___________


Download the pinglan script.
What does the file command indicate it is:___________________
Make it executable and then run it (for a minute or so)
What's the MAC/hardware address of 192.168.0.1 :___________________________
What's the Windows NetBios name of 192.168.0.12 :____________________


How many 'commands' in /usr/bin are scripts:________
How many 'commands' in /usr/bin are Bourne shell scripts:________
How many 'commands' in /usr/bin are Bourne-Again shell scripts:________

What other kinds of 'script' are in /usr/bin:___________________
Hint: file's output is : separated.  file -N doesn't "pad" the output.
sort -b ignores leading spaces.

What are the different file types in /usr/bin: (skip the symbolic links):
____________________________

Which are the ASCII English text files in /usr/bin:
______________


The bash 'help' command lists the 'commands' that are built-in to
bash. The bash_builtins file on the class web site contains the list of these 
builtin-in commands.
Which bash builtins are also the name of commands in your PATH of directories?
for i in `cat bash_builtins` ;do which $i 2>/dev/null ;done
_______________________________
When one of these command names is issued, it is the builtin that is done.
How to have the file executed instead?:____________________________


Interactively create a shell function named calc2: 
   function calc2 { echo "$*" | bc -l; }
Paste the output of 'declare -f calc2':
______________
Use it to calculate 1234*1234/4321+sqrt(999):___________

Add the l, lt, and calc functions from the "Basic compiling..." file to your .bashrc.
Execute the .bashrc in the current shell by: . .bashrc
Notice the leading dot, this means execute the file in the current shell.
(i.e. do not have a sub-shell spawned to run in it
as this will not effect the current shell when the sub-shell exits)
Paste the output of 'declare -f l':
_________________
Use the l command.