Shell script programming related 3

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:

It 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/sh"$name It is a test"

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

[~]# sh test.  #标准输入Itis#输出     

4. Show line breaks

-"ok! \ n "#-E open Escape " it it a test "  

Output Result:

OK!  It it a test  

5. Show No Line break

#!/bin/sh-"ok! \c "#-E turn on escape \c No Line break " It is a test "   

Output Result:

OK!  Itis 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

' Date '

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

The result will show the current date

Thu::       

Shell script programming related 3