shell学习笔记(1):利用IFS打印用户和默认shell

#!/bin/bash

function get_line_usr_shell(){
#    echo $#

    line="$1"
    oldIFS=$IFS

    IFS=":"
    count=0

    for item in $line
    do
        [ $count -eq 0 ] && user=$item
        [ $count -eq 6 ] && shell=$item
        let count++
    done
    IFS=$oldIFS
    echo $user\‘s shell is $shell
}

if [ $# -gt 1 ]
then
    echo "parameter is more one in main"
    exit 1
fi

while read line
do
#    echo $line
    get_line_usr_shell $line
done < $1