bash：查找目录和子目录中文件中第一个字母为z或Z的所有文件

Question

我想计算当前目录及其子目录中的所有文件，文件中的第一个字母（grep ???）是z还是Z？

尝试使用grep，head等但没有成功

Answer 1

#!/bin/bash

# find all the files (replace directory with the path to your folder)
find directory -type f | \

# read each file path
while read -r f; do 
    # read the first character of the file
    read -rn1 c < $f

    # if the 1 character matches eith Z or z, then echo the path
    [[ "$c" =~ Z|z ]] && echo $f
done | \

# count them
wc -l

# here's a one line version:
find directory -type f | while read -r f; do read -rn1 c < $f; [[ "$c" =~ Z|z ]] && echo $f; done | wc -l

Answer 2

grep有一个-c选项，它返回它找到的命中数。