Linux: Linux Command Line, Cover all essential Linux commands. A complete introduction to Linux Operating System, Linux Kernel, For Beginners, Learn Linux in easy steps, Fast!: A Beginner's Guide by Ray Yao

Author:Ray Yao [Yao, Ray]
Language: eng
Format: epub, pdf
Published: 2015-06-30T07:00:00+00:00

Chapter 19

Scripting Commands

echo: display text.

expr: perform math calculation

#!/bin/bash: put in the first line of a bash shell scripts file.

echo: display text.

Example:

root> STR=”Hello World!”

root> echo $STR

(echo: display text.

The output is “Hello World!”)

echo -e: display text using escape sequences.

Example:

root> STR=”Hello World!”

root> echo –e “\n$STR\n”

(echo -e: display text using \n. \n means add a new line.)

The output is

“

Hello World!

”

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