example02.03

  1 #!/bin/sh
  2 set file = "test03"
  3 if [ -f $file ]            #如果改为 if [ -f "$file" ]出错？？ 
  4   then
  5         echo file exists
  6 fi
  7
  8 if [ -d $file ]
  9   then
 10          echo file is a directory
 11 fi
 12
 13 if [ -s $file ]
 14   then
 15          echo file is not of zero length
 16 fi
 17
 18 if [ -r $file -a -w $file ]
 19   then
 20          echo file is readable and writeable
 21 fi