Shell programming echo command usage instructions, shell programming echo command

Shell programming echo command usage instructions, shell programming echo command

Shell echo commands are similar to PHP echo commands and are used to output values. We can use echo to implement more complex output format control.

Show normal strings

Echo "Hello World" echo Hello World

The output results of these two sentences are: Hello World.

Show escape characters

Echo "\" Hello World \ "" echo \ "Hello World \"

The output result is "Hello World"

Show Variables

The read command reads a line from the standard input and specifies the value of each field in the input line to the shell variable.

Read nameecho "Your input is $ name"

Name receives standard input variables.

Display line feed

Echo-e "OK! \ N "#-e enable escape echo" It is a test"

Output result:

Show do not wrap

Echo-e "OK! \ C "#-e enable escape \ c do not wrap echo" It is a test"

Output result:

The display result is directed to the file.

Echo "It is a test"> myfile

Output string without escape or variable (single quotation marks)

Echo '$ name \"'

Output result: $ name \"

Display command execution results

Echo 'date'

The result shows the current date: