In computing, a shebang is the character sequence consisting of the characters number sign and exclamation point (#!), when it occurs as the first two characters on the first line of a text file.

We are going to be using the common 'Bash' interpreter, so when we say 'shell script' here, we really mean a bash shell script. The script calls an interpreter to run it. This points to the default shell program for your Linux installation, whether it is bash, dash, ash or something else.Ī shell script is a text file.

(Hereafter shebang bin bash.) For scripts that are more 'generic' and portable from one *NIX system to another, you can use #!/bin/sh instead.

Thus, the first line of our script needs to be #!/bin/bash with no spaces. Since we are writing bash scripts, the path to the interpreter is /bin/bash. The shebang identifies the file as a script. The shebang is simply 2 characters, a # and a !. The first line of any shell script is a 'shebang' and then a file path to follow to find the interpreter. For daily basic tasks suitable for automation, Bash scripts offer a great solution and Bash is normally found on most Linux installations. Most shell scripts are based on full programming services and not a set of minimalist commands found in DOS batch files. Shell scripting in Linux is very powerful and can use multiple processing environments like Bash, PHP, Perl, and many other scripting languages. This unit barely introduces Bash shell scripting. Learning objective: (2) Explain the purpose of a script Introduction to Vi, Bash Scripts, and FTP Introduction to Vi, Bash Scripts, and FTP

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