highest

linux脚本编程的例子

if [ -n "$(echo $1 | grep '^-[0-9][0-9]*$')" ]; then
    howmany=$1
    shift
elif [ -n "$(echo $1 | grep '^-')" ]; then
    print 'usage: highest [-N] filename'
    exit 1
else
    howmany="-10"
fi

filename=$1
sort -nr $filename | head $howmany