Shell Learning 13-shell echo Command

Echo is an internal command of the shell that prints the specified string on the screen. Command format:

Echo Arg

You can use echo to achieve more complex output format control.
Show escape characters

echo "\" It is a test\ ""

The result will be:

"It is a test"

Double quotes can also be omitted.
Show Variables

Name= "OK" echo "$name It is a test"

The result will be:

OK It is a test

The same double quotation marks can also be omitted.
If the variable is connected to another character, you need to use curly braces ({}):

Mouth=8echo "${mouth}-1-2009"

The result will be:

8-1-2009

Show line breaks

echo "ok!\n" echo "It is a test"

Output:

Ok! It is a test

show No line breaks

echo "Ok!\c" echo "It is a test"

Output:

Ok! It si a test

Show results redirected to file

echo "It is a test" > myfile

output String as-is
If you want to output the string as-is (without escaping), use single quotation marks. For example:

echo ' $name \ '

Show command execution results

Echo ' Date '

The result will show the current date
As can be seen from the above, double quotes are dispensable, single quotes are mainly used in the original output.

Shell Learning 13-shell echo Command