腳本，sudo文件添加項

 

該腳本作爲練習只用，修改sudo文件還請使用visudo命令，防止修改錯誤造成安全事故！

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

  練習實現在/etc/sudoers文件中交互式的添加內容，要求能根據用戶需求創建所需的組

  寫的很糾結~錯誤百出。並且是實現的算法有的太複雜了，先貼上原始的一；後期在進行修改了再附加。過程不多解釋。

 

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"

 附註：如何從鍵盤讀入一行數據並且賦值給變量。

read用法：
read [ -p ][  -r ][ -s ][ -u [ n ] ] [  VariableName ]
read 命令從標準輸入中讀取一行，並把輸入行的每個字段的值指定給 shell 變量，用 IFS（內部字段分隔符）變量中的字符作爲分隔符。VariableName 參數指定 shell 變量的名稱，shell 變量獲取輸入行一個字段的值。由VariableName 參數指定的第一個 shell 變量指定給每一個字段的值，由　VariableName 參數指定的第二個 shell 變量指定給第二個字段的值，以此類推，直到最後一個字段。如果標準輸入行的字段比相應的由 VariableName 參數指定的 shell 變量的個數多，把全部餘下的字段的值賦給指定的最後的 shell 變量。如果比 shell 變量的個數少，則剩餘的 shell 變量被設置爲空字符串。

如果輸入的一個串中間有空格，read一個變量，該變量顯然只能截取並得到串中第一個空格前的子串。未解決丟失，read時，用兩個變量，則第一個變量會獲取第一個空格前的子串，第二個變量會獲取其後的所有串。然後將兩個變量銜接即可

例如97行：

• read -p "Please input a sudo command: " comm1 comm2 
• comm=`echo "${comm1} ${comm2}"`