脚本，sudo文件添加项

 

该脚本作为练习只用，修改sudo文件还请使用visudo命令，防止修改错误造成安全事故！

--------------------------------------------

  练习实现在/etc/sudoers文件中交互式的添加内容，要求能根据用户需求创建所需的组

  写的很纠结~错误百出。并且是实现的算法有的太复杂了，先贴上原始的一；后期在进行修改了再附加。过程不多解释。

 

方法（1）

#!/bin/bash
#Author: Mo
#Date & Time: 2011-01-02-20:55:40
#Description:
#Version : 1.0.1

runas=root
machine=ALL
ualias=' '
halias=' '

mytrap(){
echo -e "\nQuit...\n Clean all your input messsage..."
exit 1
}
trap 'mytrap'  SIGINT

# user functions... #########################
testuser() {
 if  cut -d: -f1 /etc/passwd | grep "^$1$" &>/dev/null; then
   return 0
  else
   echo "No user $1,please check ."
   return 99
 fi
  }

adduser(){
    while [ -z ${user} ] ;do
       read -p "Please input sudo user: " user
       testuser ${user}
       [ $? -eq 99 ] && user=''
    done
    uarray[${#uarray[*]}]=${user}
    user=' '
}

useralias() {
  read -p "Enter user alias name(upper):" ualias
  if  echo $ualias | grep "[^a-zA-Z]" &>/dev/null ;then
      echo "Wrong input!"
      exit 1
  else
     ualias=`echo ${ualias} | tr 'a-z' 'A-Z'`
  fi

 flag1=y
 while [ "${flag1}" = "y" ] ;do
    adduser
    read -p "Wish to add another user(y/n): "  flag1
    flag1=${flag1:=y}
    if  echo "${flag1}"|grep "[YNyn]" &>/dev/null ;then
       [ "${flag1}" = "y" ] && uarray[${#uarray[*]}]="${user}," || uarray[${#uarray[*]}]=${user}
    else
       echo "Wrong Select!"
       exit 1
    fi

done
 }
# host funcitons...#######################
addhost(){
    host=' '
    while [ -z ${host} ] ;do
       read -p "Please input host: " host
    done
    harray[${#harray[*]}]=${host}
}

hostalias() {
  read -p "Enter host alias name(upper):" halias
  if  echo ${halias} | grep "[^a-zA-Z]" &>/dev/null ;then
      echo "Wrong Name!"
      exit 1
  else
     halias=`echo ${halias}| tr 'a-z' 'A-Z'`
  fi
 flag2=y
 while [ "${flag2}" = "y" ] ;do
    addhost
    read -p "Wish to add another host(y/n): "  flag2
    flag2=${flag2:=y}
    if  echo "${flag2}" | grep "[YNyn]" &>/dev/null ;then
       [ "${flag2}" = "y" ] && harray[${#harray[*]}-1]=${host}, || harray[${#harray[*]}-1]=${host}
    else
       echo "Wrong Select!"
       exit 1
    fi
 done
 }

#command function...#######################

addcomm(){
    while [ -z ${comm} ] &>/etc/null ;do
#how to read a command line?
       read -p "Please input a sudo command: " comm1 comm2
       comm=`echo "${comm1} ${comm2}"`
    done
    carray[${#carray[*]}]=${comm}
    comm=' '
}

commalias() {
  read -p "Enter command alias name(upper):" calias
  if  echo ${calias} | grep "[^a-zA-Z]" &>/dev/null ;then
      echo "Wrong input!"
      exit 1
  else
     calias=`echo ${calias} | tr 'a-z' 'A-Z'`
  fi

 flag3=y
 while [ "${flag3}" = "y" ] ;do
    addcomm
    read -p "Wish to add another command(y/n): "  flag3
    flag3=${flag3:=y}
    if  echo "${flag3}"|grep "[YNyn]" &>/dev/null ;then
       [ "${flag3}" = "y" ] && carray[${#carray[*]}]=${comm}, || carray[${#carray[*]}]=${comm}
    else
       echo "Wrong Select!"
       exit 1
    fi

done
 }

# user add... #############################
cat  <<EOF
       1) Create user alias;
       2) Add a single user;
EOF
read -p "Enter your select: " select1

case ${select1} in
 1)
   useralias
   ;;
 2)
   adduser
   ;;
 *)
   echo "Wrong select!"
   exit 1
   ;;
 esac

# host add... ###############################
cat  <<EOF
       1) Create host alias;
       2) Add a single host;
EOF
read -p "Enter your select: " select2

case ${select2} in
 1)
   hostalias
   ;;
 2)
   addhost
   ;;
 *)
   echo "Wrong select!"
   exit 1
   ;;
 esac

# command add...#################################
cat  <<EOF
       1) Create command alias;
       2) Add a single commond;
EOF
read -p "Enter your select: " select3

case ${select3} in
 1)
   commalias
   ;;
 2)
   addcomm
   ;;
 *)
   echo "Wrong select!"
   exit 1
   ;;
esac


# appent thess informatin to file:/etc/sudoers
# US HO = (root) COM

if [ ${#uarray[*]} -gt 1 ];then
   echo  "User_Alias    ${ualias} = ${uarray[*]} " >> /etc/sudoers
fi

if [ ${#harray[*]} -gt 1 ];then
   echo  "Host_Alias    ${halias} = ${harray[*]} " >> /etc/sudoers
fi

if [ ${#carray[*]} -gt 1 ];then
   echo  "Comm_Alias    ${calias} = ${carray[*]} " >> /etc/sudoers
fi

LINE="`[ ${#uarray[*]} -gt 1 ] && echo -n "${ualias}" || echo -n "${uarray[*]}" `"
LINE="${LINE}   `[ ${#harray[*]} -gt 1 ] && echo -n "${halias}" || echo -n "${harray[*]}" ` "
LINE="${LINE}=(root)     "
LINE="${LINE}   `[ ${#carray[*]} -gt 1 ] && echo -n "${calias}" || echo -n "${carray[*]}" ` "
echo "${LINE}" >> /etc/sudoers

echo -e  "\033[32mAll Done!\033[0m"

 附注：如何从键盘读入一行数据并且赋值给变量。

read用法：
read [ -p ][  -r ][ -s ][ -u [ n ] ] [  VariableName ]
read 命令从标准输入中读取一行，并把输入行的每个字段的值指定给 shell 变量，用 IFS（内部字段分隔符）变量中的字符作为分隔符。VariableName 参数指定 shell 变量的名称，shell 变量获取输入行一个字段的值。由VariableName 参数指定的第一个 shell 变量指定给每一个字段的值，由　VariableName 参数指定的第二个 shell 变量指定给第二个字段的值，以此类推，直到最后一个字段。如果标准输入行的字段比相应的由 VariableName 参数指定的 shell 变量的个数多，把全部余下的字段的值赋给指定的最后的 shell 变量。如果比 shell 变量的个数少，则剩余的 shell 变量被设置为空字符串。

如果输入的一个串中间有空格，read一个变量，该变量显然只能截取并得到串中第一个空格前的子串。未解决丢失，read时，用两个变量，则第一个变量会获取第一个空格前的子串，第二个变量会获取其后的所有串。然后将两个变量衔接即可

例如97行：