$*和$@

 1 #!/bin/bash
  2 # arglist.sh
  3 # 多使用几个参数来调用这个脚本, 比如"one two three".
  4 
  5 E_BADARGS=65
  6 
  7 if [ ! -n "$1" ]
  8 then
  9   echo "Usage: `basename $0` argument1 argument2 etc."
 10   exit $E_BADARGS
 11 fi  
 12 
 13 echo
 14 
 15 index=1          # 起始计数.
 16 
 17 echo "Listing args with \"\$*\":"
 18 for arg in "$*"  # 如果"$*"不被""引用,那么将不能正常地工作.
 19 do
 20   echo "Arg #$index = $arg"
 21   let "index+=1"
 22 done             # $* 将所有的参数看成一个单词.
 23 echo "Entire arg list seen as single word."
 24 
 25 echo
 26 
 27 index=1          # 重置计数(译者注: 从1开始).
 28                  # 如果你写这句会发生什么?
 29 
 30 echo "Listing args with \"\$@\":"
 31 for arg in "$@"
 32 do
 33   echo "Arg #$index = $arg"
 34   let "index+=1"
 35 done             # $@ 把每个参数都看成是单独的单词.
 36 echo "Arg list seen as separate words."
 37 
 38 echo
 39 
 40 index=1          # 重置计数(译者注: 从1开始).
 41 
 42 echo "Listing args with \$* (unquoted):"
 43 for arg in $*
 44 do
 45   echo "Arg #$index = $arg"
 46   let "index+=1"
 47 done             # 未引用的$*将会把参数看成单独的单词. 
 48 echo "Arg list seen as separate words."
 49 
 50 exit 0