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    shell脚本nicenumber实现代码

    Given a number, shows it in comma-separated form.Expects DD and TD to be instantiated. Instantiates nicenum. or, if a second arg is specified, the output is echoed to stdout.

    废话不多说,首先是

    #!/bin/sh
    # nicenumber -- Given a number, shows it in comma-separated form.
    # Expects DD and TD to be instantiated. Instantiates nicenum
    # or, if a second arg is specified, the output is echoed to stdout.
    
    nicenumber()
    {
     # Note that we assume that '.' is the decimal separator in
     # the INPUT value to this script. The decimal separator in the output value is
     # '.' unless specified by the user with the -d flag
    
     integer=$(echo $1 | cut -d. -f1)       # left of the decimal
     decimal=$(echo $1 | cut -d. -f2)       # right of the decimal
    
     if [ $decimal != $1 ]; then
      # There's a fractional part, so let's include it.
      result="${DD:="."}$decimal"
     fi
    
     thousands=$integer
    
     while [ $thousands -gt 999 ]; do
      remainder=$(($thousands % 1000))  # three least significant digits
    
      while [ ${#remainder} -lt 3 ] ; do # force leading zeros as needed
       remainder="0$remainder"
      done
    
      thousands=$(($thousands / 1000))  # to left of remainder, if any
      result="${TD:=","}${remainder}${result}"  # builds right to left
     done
    
     nicenum="${thousands}${result}"
     if [ ! -z $2 ] ; then
      echo $nicenum
     fi
    }
    
    DD="." # decimal point delimiter, to separate integer and fractional values
    TD="," # thousands delimiter, to separate every three digits
    
    while getopts "d:t:" opt; do
     case $opt in
      d ) DD="$OPTARG"  ;;
      t ) TD="$OPTARG"  ;;
     esac
    done
    shift $(($OPTIND - 1))
    
    if [ $# -eq 0 ] ; then
     echo "Usage: $(basename $0) [-d c] [-t c] numeric value"
     echo " -d specifies the decimal point delimiter (default '.')"
     echo " -t specifies the thousands delimiter (default ',')"
     exit 0
    fi
    
    nicenumber $1 1     # second arg forces nicenumber to 'echo' output
    
    exit 0

    这脚本我们以后分析,现在先mark下。

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