Question

这是从data.txt文件中删除员工。在用户输入要删除的ID之后，我想编程只搜索文件的第一列（Emp ID列）而不是整个文件的数据。我已经编写了代码，但它似乎会搜索txt文件中的所有数据。

我该如何改进呢？

代码：

  Payroll =data.txt
   echo
   echo "[Option: $input]"
   echo -e "${UBlue}Removing employee record: "
   echo -e "Please enter the employee's ID.${NoColor}"
   echo
   echo -en "Employee ID: "
   read empid_search

   if [ `count_lines "^${empid_search},"` -eq 0 ]
   then
       echo "Error: This particular record does not exist!!"
   else
       echo "Please verify removal of this employee's record: " 
       echo -en "Employee's Details: "
       locate_lines "^${empid_search}"     

       confirm "Confirm remove?[y/n]" 
       if [ $? -ne 0 ]
       then
          echo "Entry has not been deleted.."  
       else
          cp $PAYROLL tmpfile
          grep -vi "$empid_search" tmpfile > $PAYROLL ; rm tmpfile
          echo "Entry is deleted from records.."
       fi           
   fi

   echo -en "Hit [Enter] to return to main menu..."
   read

文字档案：

1,James,Manager,Admin,1300
2,Sally,Executive,Sales,2000
3,John,CEO,xpy,2

Answer 1

你快到了。只是在grep命令中缺少^和,。

grep -vi "^${empid_search}," tmpfile > $PAYROLL

注意：最好将变量名称括在{}

中

也可以尝试使用sed。它可以进行就地删除，避免需要 tmpfile

sed -i "/^${empid_search},/d" $PAYROLL

使用awk的另一种变体。处理格式良好的 csv 文件时更强大。

awk -F, '$1!="'${empid_search}'"' tmpfile > $PAYROLL

在文本文件shell脚本的第1列中搜索

1 个答案: