实现shell脚本nicenumber的示例分析-创新互联
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创新互联专注为客户提供全方位的互联网综合服务,包含不限于成都网站制作、成都网站设计、贡嘎网络推广、微信平台小程序开发、贡嘎网络营销、贡嘎企业策划、贡嘎品牌公关、搜索引擎seo、人物专访、企业宣传片、企业代运营等,从售前售中售后,我们都将竭诚为您服务,您的肯定,是我们大的嘉奖;创新互联为所有大学生创业者提供贡嘎建站搭建服务,24小时服务热线:028-86922220,官方网址:www.cdcxhl.comGiven 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.
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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