Shell script echo command using tips _linux shell

ECHO is an internal instruction of the shell to print out the specified string on the screen. Command format:

Copy Code code as follows:

Echo Arg

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

Show escape characters

Copy Code code as follows:

echo "\" It is a test\ ""

The result will be:
"It is a test"

Double quotes can also be omitted.

Show variables

Copy Code code as follows:

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.

You need to use curly braces ({}) if the variable is connected to another character:

Copy Code code as follows:

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

The result will be:
8-1-2009

Show Line Wrapping

Copy Code code as follows:

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

Output:
Ok!
It is a test

Show No Line wrapping

Copy Code code as follows:

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

Output:
Ok! It si a test

Show results directed to file

Copy Code code as follows:

echo "It is a test" > myfile

Output string AS-is

Use single quotes if you want to output strings as they are (without escaping). For example:

Copy Code code as follows:

echo ' $name \ '

Show Command Execution results

Copy Code code as follows:

Echo ' Date '

The result displays the current date

As you can see from the above, double quotes are dispensable, and single quotes are mainly used in the original output.