blank Give the shell variable that indicates your home directory. ________
$HOME

blank  Give the command that displays the current working directory. ______
pwd

blank Give the shell variable that indicates the current working directory. ______
$PWD

blank Give the symbolic name for the parent directory (same in all directories). ______
..   

blank Besides a regular file, Unix recognizes several other file types.  Name another file type you can encounter in a Unix system. ______
named pipe        
character special   
block special    
symbolic link    
socket
directory

blank Besides a regular file, Unix recognizes several other file types.  Name another file type you can encounter in a Unix system. ______
named pipe        
character special   
block special    
symbolic link    
socket
directory

blank Give the command to create a directory __________
mkdir

blank Besides a regular file, Unix recognizes several other file types.  Name another file type you can encounter in a Unix system. ______
named pipe        
character special   
block special    
symbolic link    
socket
directory

blank Give a command to remove an empty directory __________
rmdir

blank  Give the ls command and option[s] that lists additional information, i.e type, permissions, link count, uid, gid, etc. __________
ls -l

blank  Give the ls command and option[s] that lists all files including those normally not displayed. __________
ls -a

blank  Give the ls command and option[s] that shows, in some form, any non-printable characters in a file's name. __________
ls -q
ls -b

blank Use ls and filename meta-characters to list all files beginning with the letter d. ____________
ls d*

blank Use ls and filename meta-characters to list all files that have filenames that are 3 characters long. (any three). __________
ls ???

blank Use ls and filename meta-characters to list all files that begin with one of the following :  a e i o u __________
ls [aeiou]* 

blank Use ls, filename meta-characters, and the variable fn to list all files that begin with the string stored in fn and end with the string boat or cat.
___________
ls $fn{boat,cat}

blank Give the Unix copy command and option to copy the regular file fn1 to fn1.bak  Have copy prompt for permissions if fn.bak already exists.  
cp -i fn1 fn1.bak ______________

blank Give the Unix copy command and option to copy the regular file fn1 to 
fn1a. Have copy preserve same permissions on new copy as original. __________
cp -p fn1 fn1a

blank Give the Unix copy command and option to copy the directory file dir1 to 
dir2 _________
cp -r dir1 dir2

blank Name the command and option that can block the program listed above : ______
mesg n