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:

echo string

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

1. Display Normal string:

echo "It is a test"

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

Echo It is a test

2. Show escape characters

echo "\" 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

Read name

echo "$name 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 tesh.sh

OK #标准输入

OK It is a test #输出

4. Show line breaks

Echo-e "ok! \ n "#-E Open escape

echo "It is a test"

Output Result:

Ok!

It is a test

5. Show No Line break

#!/bin/sh

Echo-e "ok! \c "#-E Open escape \c no Line break

echo "It is a test"

Output Result:

Ok! It is a test

6. Show results directed to file

echo "It is a test" > myfile

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

echo ' $name \ '

Output Result:

$name \ "

8. Show command Execution results

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

The result will show the current date

Thu Jul 10:08:46 CST 2014

Shell echo Command