我要评论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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