我們用各種格式來撰寫一個複合的條件式程式碼，讀者可以 觀摩各種增加程式可讀性的技巧。 
for file 
do 
   if test -f $file
   then
      if  test -r $file
      then 
	 if test -x $file
	 then
	    echo "File $file is 
            readable and executable"
	 fi
      fi
   fi
done

for file 
do 
   if [ -f $file ]
   then
      if  [ -r $file ]
      then 
	 if [ -x $file ]
	 then
	    echo "File $file is 
            readable and executable"
	 fi
      fi
   fi
done

for file 
do 
   if [ -f $file -a -r $file  -a -x $file ]
   then 
       echo File $file is readable and executable
   fi
done

 
for file 
do 
[ -f $file -a -r $file  -a -x $file ] && echo File $file is readable and executable
done
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