opening sh files in kali code example

Example 1: how to run shell script

include 
#!/bin/bash (1st line inside yourfile.sh)

to run
./yourfile.sh

if you do not include that line
bash yourfile.sh

Example 2: how to run shell script

# method 1
chmod +x <filename>
./<filename>

# method 2
sh <filename>.sh

# method 3 (Only for bash script)
bash <filename>.sh