Linux Learning basic Practice--echo/printf usage

1. is echo an internal command or an external command? What is its role? How do i show "The Year is 2016.Today is 10yue 26" for two lines?

With the type command, ECHO is an internal command:

[[Email protected] ~]# type echo

Echo is a shell builtin

echo function: Displays the input content directly.

Echo-e "The year is 2016. \ n today is 7. "

[Email protected] ~]# ECHO-E "The year is 2016. \ntoday is 7. "

The year is 2016.

Today is 7.

2. is printf an internal command or an external command? What is its role? How do i show "The Year is 2016.Today is 10yue 26" for two lines?

With the type command, printf is an internal command:

[[Email protected] ~]# type printf

printf is a shell builtin

printf role: Format and display the input content.

printf "The year is 2016. \ n today is 7. "

[Email protected] ~]# printf "The year was 2016.Today is 7.\n"

The year was 2016.Today is 7.

[Email protected] ~]#

3. Use and usage of File command

Man file determine filename type OK

Eg:file/bin/ls

File absolute Path

This article is from the "Learn Linux history" blog, please be sure to keep this source http://woyaoxuelinux.blog.51cto.com/5663865/1859079

Linux Learning basic Practice--echo/printf usage