Shell echo Command

Shell echo Command

The echo command of the Shell is similar to the echo command of PHP, and is used for the output of strings. Command format:

String

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

1. Display Normal string:

" It is a test "

The double quotes here are completely omitted, and the following commands are identical to the previous instance:

 is a test

2. Show escape characters

" \ "It is a test\" "

The result will be:

" It is a test "

Similarly, double quotes can also be omitted

3. Display variables

The read command reads a row from the standard input and assigns the value of each field in the input row to the shell variable

#!/bin/"$name It is a test"

The above code is saved as test.sh,name to receive the standard input variables, the result will be:

[Email protected] ~]# sh Test.shok                       is a test        #输出

4. Show line breaks

" ok! \ n " #-"it it a test"

Output Result:

Ok! it it a test

5. Show No Line break

#!/bin/"ok! \c" #-"It is a test"

Output Result:

 is a test

6. Show results directed to file

" It is a test " > MyFile

7. Output strings As-is, without escaping or taking variables (in single quotes)

' $name \ " '

Output Result:

$name \"

8. Show command Execution results

Echo ' Date '

Note: the use of anti-quotes ' instead of single quotes is used here .

The result will show the current date

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Shell echo Command