sed && awk lookup 解答

[email protected]:/home/koyaku# vim lookup 

  2
  3 #0
  4 BEGIN { FS = " "; OFS = " "
  5         #prompt user
  6         printf("Enter a glossary term:")
  7 }
  8
  9 #1 read local file named glossary
  2
  3 #0
  4 BEGIN { FS = " "; OFS = " "
  5         #prompt user
  6         printf("Enter a glossary term:")
  7 }
  8
  9 #1 read local file named glossary
 10 FILENAME == "glossary" {
 11     #load each glossary entry into an array
 12     entry[$1]=$2
 13     next
 14 }
 15
 16 #2 scan for command to exit program
 17 $0 ~ /^(quit|[qQ]|exit|[xX])$/{ exit }
 18
 19 #3 process any non-empty line
 20 $0 != ""{
 21     printf "in this roud"
 22     print entry[1]
 23     if ( $0 in entry ){
 24         # it is there,print definition
 25         printf "in the entry"
 26         print entry[$0]
 27         }else
 28             print $0 "not found"
 29     }
 30
 31 #4 prompt user again for another term
 32 {
 33     printf("Enter another glossary term (q to quit):")
 34     }‘ glossary -

手动敲上面代码遇到几个问题和疑惑

1.按照书上给的是“\t” 实际敲的是“ ”，所有导致得不到正确的结果。第十行的意思是在当前目录中找到文件名为glossary的文件，并且由“ ”（空格分隔），将后面的赋值给前面比如entry[BASIC] =Beginners  entry[CICS]= Customers 等等

2.第二十到二十三行。就是你输入的值为$0。检查这个值是否在ｅｎｔｒｙ数组中，即ＢＡＳＩＣ＼　ＣＯＢＯＬ＼ＣＩＣＳ等。如果在就打印ｅｎｔｒｙ对应的值，没有就输出ｎｏｔｆｏｕｎｄ

３.glossary　－　　是什么意思？