linux学习笔记-学生信息管理系统（shell编程）

    #!/bin/sh
    insertMsg()
    {
       echo "1,Student's basic Message"
       echo "2,Student's Marks Message"
       read yourSel
       if test "$yourSel" = "1" 
    then
        echo "input you want to add Student's basic Message"
        read stu_bas_msg
        echo "$stu_bas_msg" >>StudentMsg.txt
        echo "Save success"
       else
        echo "input you want to add Student's Marks Message"
        read stu_marks
        echo "$stu_marks" >>StudentMarks.txt
        echo "Save success"
       fi
    }
    
    outputSelStuMsg()
    {
    echo "Enter student id you want to find a student"
    read student_id
    return_msg=$(ps -ef|grep -rn "$student_id" StudentMsg.txt)
    stu_finalmsg=${return_msg#*:}
    stu_finalmsg=${stu_finalmsg%,*}
    school_id=${return_msg##*,}
    school_name=$(ps -ef|grep -rn "$school_id" SchoolofMsg.txt)
    school_name=${school_name##*,}
    echo " Sno Sname major "
    echo "$stu_finalmsg,$school_name"
    }
    
    
    updataStudentMessage()
    {
    echo "The input you want to modify the student's student id"
    read student_nub
    echo "input Sname,school_id and so on"
    sed  -i "/$student_nub/d" StudentMsg.txt
    read newMsg 
    echo "$newMsg" >>StudentMsg.txt    
    echo "updata success!"  
    }
    
    outputStudentMarksSum()
    {
    sort -r ',' -k 4 StudentMarks.txt
    }
    
    echo "1, output student"
    echo "2,update student"
    echo "3, output sort"
    echo "4,result"
    echo "5,exit"
    read i
    case "$i" in
    1)  insertMsg;;
    2)  outputSelStuMsg;;
    3)  outputSelStuMsg;;
    4)  outputStudentMarksSum;;
    5)  exit 0;;
    esac
    exit 0