Question

我有一个名为contacts.txt的文本文件，其中填充了少量行。在这个文件中，前两行是标题，所以我不想在这两行中做任何事情。

我想从用户那里获得输入，搜索联系人文件，并显示匹配的行。如果使用tail管道传输到grep，我会获得准确的数据，但没有标题。我怎样才能获得标题行？

echo -n "Enter the value to search: ";read search1; echo -e "\n"
if [ $(tail -n +3  /root/scripts/contacts.txt | grep -i  $search1 | wc -l) -eq 0 ]; then
        echo -e "No matching rows found!!!! \n"
        echo -n "To re-enter press r. To go back to main menu press any key: "; 
        read reenter;
        echo -e "\n";
        if [ "$reenter" == "R" ] || [ "$reenter" == "r" ]; then
           remove_entry  # calling a function
        else
           inputscan # calling a function
        fi
else
        echo -n "Number of Matching rows found:"; tail -n +3  /root/scripts/contacts.txt | grep -i $search1 | wc -l; echo -e "\n";
        tail -n +3 /root/scripts/contacts.txt | grep -i "$search1" | column -t -s";";
fi

Answer 1

正如你所说的前两行是标题所以修改你的脚本如下所示打印标题： -

echo -n "Number of Matching rows found:"; tail -n +3  /root/scripts/contacts.txt | grep -i $search1 | wc -l; echo -e "\n";

#Print first two lines of the file
head -2 /root/scripts/contacts.txt 

tail -n +3 /root/scripts/contacts.txt | grep -i "$search1" | column -t -s";";

Answer 2

早上好，我对你的剧本做了一些修改：

将contacts.txt文件路径放在一个变量中，以避免不得不反复输入（如果以后更改它会很好！）
将用于计算变量匹配数的代码放入，以避免运行该代码两次

添加head -2以输出标题行。

#!/bin/bash

echo -n "Enter the value to search: ";read search1; echo -e "\n"

contactsfile='/root/scripts/contacts.txt'
number_matching_rows=$(tail -n +3 $contactsfile | grep -i  $search1 | wc -l)

if [ $number_matching_rows -eq 0 ]; then
        echo -e "No matching rows found!!!! \n"
        echo -n "To re-enter press r. To go back to main menu press any key: "; 
        read reenter;
        echo -e "\n";
        if [ "$reenter" == "R" ] || [ "$reenter" == "r" ]; then
           remove_entry  # calling a function
        else
           inputscan # calling a function
        fi
else
        echo "Number of Matching rows found: $number_matching_rows"
        head -2 $contactsfile
        tail -n +3 $contactsfile | grep -i "$search1" | column -t -s";";
fi

Answer 3

您可以使用<p id="demo"></p>并通过在大括号块中组合它们来管道多个命令的输出。

head -2

如何在除前两行之外的文件中的所有行中grep匹配模式

3 个答案: