Shell programming constructs

The following sections contain models of the shell programming constructs.

Here document

   command <<!
   input lines
   !

For loop

   for variable
   	in this list of values
   do
   	command 1
   	command 2
   	.
   	.
   	.
   	last command
   done

While loop

   while command list
   do
   	command 1
   	command 2
   	.
   	.
   	.
   	last command
   done

If...then

   if
   	this command list is successful
   then
   	command 1
   	command 2
   	.
   	.
   	.
   	last command
   fi

If...then...else

   if
   	this command list is successful
   then
   	command 1
   	command 2
   	.
   	.
   	.
   	last command
   else
   	command 1
   	command 2
   	.
   	.
   	.
   	last command
   fi

Case construction

   case word in
   pattern1)
   	command 1
   	. . .
   	last command
   	;;
   pattern2)
   	command 1
   	. . .
   	last command
   	;;
      .
      .
      .
   last pattern2)
   	command 1
   	. . .
   	last command
   	;;
   esac

Break and continue statements

A break or continue statement forces the program to leave any loop and execute the command following the end of the loop.