#!/bin/bash is the shell declaration that is added to the first line of a bash script.
#! is referred to as a shebang or hashbang and is followed by the path to the shell./bin/bash is the path to the shell and is not the correct syntax for a shell script./bin/tsh is the path the trusted shell, tsh.#!/bin/csh would be used if the C shell was being used instead of the bash shell.
The first line in Bash scripts is a character sequence known as the "shebang." The shebang is the program loader's first instruction when executing the file, and the characters indicate which interpreter to run when reading the script.
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