查找用户信息

#!/bin/bash

cat iplist | while read ip username
do 
    printf "${ip}, ${username}, "
    eval $(ssh -q ${ip} "awk -v user_name=$username -F':' '$0 ~ user_name {printf("user_id=%s group_id=%s", $3, $4)}' /etc/passwd" < /dev/null)
    printf "${user_id}, ${group_id}
"
done

awk与shell之间变量的互传。