How to use a Shell script to count the number of lines in a file?

You can use the following command to count the number of lines in a file:

#!/bin/bash

file="example.txt"  # 文件名

# 使用wc命令统计文件的行数并保存到变量中
line_count=$(wc -l < "$file")

echo "文件 $file 中的行数为: $line_count"

Save the above code as a file called count_lines.sh and give it execute permissions. Then run the script in the terminal.

chmod +x count_lines.sh
./count_lines.sh

The above command will display the number of lines in the file example.txt. You can replace example.txt with the name of the file you want to count the lines of.