一道shell小测试题及答案

时间：2007-03-27 来源：bleach

写个脚本txtdel.sh,当运行后有下列运行结果:
无参数,扫描当前文件夹下所有.txt结尾的文件,列出前三行,提示是否要删除. $ ls food.txt
myprog.java
diary.txt
tempfile
story.txt $ txtdel.sh File: food.txt
Line 1: Chicken rice
Line 2: Hamburgers
Line 3: Curry
Delete? Y (user input)
File food.txt has been deleted. File: diary.txt
Line 1: Today I got up
Line 2: went to university
Line 3: and learned about UNIX!
Delete? N (user input)
File diary.txt was NOT deleted. File: story.txt
Line 1: It was a cold and stormy night…
Line 2: lots of rain…
Line 3: really quite awful…
Delete? Y (user input)
File story.txt has been deleted. No more .txt files to process. Finished! 答案： #!/bin/bash
for i in `find . -type f -name "*.txt"`
do
     echo File: $i
     head -n 3 $i |nl|sed 's/^     /Line /'|sed 's/Line../&:/'
     echo -n "Delete? Y|N: "
     read a
         if [ $a == 'Y' ]
          then
            echo -n "really del $i, Y|N :"
             read b
                if [ $b == 'Y' ]
                 then
                  rm $i
                  echo "File $i has been deleted."
                elif [ $b == 'N' ]
                  then
                   echo
                   echo "File $i was NOT deleted."
                fi
         elif [ $a == 'N' ]
           then
            echo " $i was NOT deleted."
         fi
     echo
done

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