Suppose we have these 3 scripts, and you just want to check the first line of each script (their shebangs). You can use head and specify the number of lines with -n argument.
tree
.
├── script1.sh
├── script2.sh
└── script3.sh./* means all files in the current directory. It’s used since head requires files.
head -n 1 ./*
==> ./script1.sh <==
#!/bin/bash
==> ./script2.sh <==
#!/bin/sh
==> ./script3.sh <==
#!/usr/bin/env bash