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 [ $thousands -gt 999 ]; doremainder=$（（$thousands % 1000））# three least significant digitswhile [ ${#remainder} -lt 3 ] ; do # force leading zeros as needed remainder="0$remainder"donethousands=$（（$thousands / 1000））# to left of remainder, if anyresult="${TD:=","}${remainder}${result}"# builds right to left done nicenum="${thousands}${result}" if [ ！ -z $2 ] ; thenecho $nicenum fi}DD="." # decimal point delimiter, to separate integer and fractional valuesTD="," # thousands delimiter, to separate every three digitswhile getopts "d:t:" opt; do case $opt ind ） DD="$OPTARG";;t ） TD="$OPTARG";; esacdoneshift $（（$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 0finicenumber $1 1 # second arg forces nicenumber to "echo" outputexit 0

这脚本我们以后分析，现在先mark下。