1、本地变量：set variable_name = value
全局变量：setenv VARIABLE_NAME value

2、The special variable $< reads a line of input from the user and assigns it to a variable.

EXAMPLE

echo "What is your name?"

set name = $<

3、set names = ( Tom Dick Harry Fred )

shift names

4、@  n=5+5
echo $n

5、if ( expression ) then

   block of statements

else if ( expression ) then

   block of statements

else if ( expression ) then

   block of statements

else

   block of statements

endif

6、echo $argv[1] $argv[2] $argv[3]
  
echo $argv[*]   all the arguments
 
echo $#argv    the number of arguments
 

7、switch ( "$color" )

   case blue:

      echo $color is blue

      breaksw

   case green:

      echo $color is green

      breaksw

   case red:

   case orange:

      echo $color is red or orange

      breaksw

   default:

      echo "Not a valid color"

endsw
8、
The loop control commands are break and continue.

EXAMPLE

while ( expression )

   block of statements

end

foreach variable ( word list )

   block of statements

end

------------------------------

foreach color (red green blue)

   echo $color

end

10、-r   Current user can read the file
 
-w   Current user can write to the file
 
-x    Current user can execute the file
 
-e    File exists
 
-o    Current user owns the file
 
-z    File is zero length
 
-d     File is a directory
 
-f     File is a plain file