[Shell Foundation]--echo Command

echo command: Used primarily for output in the shell

1.-N does not wrap the display result (by default, the line is wrapped)

2.-E "" supports using some special characters in double quotes

The usual special characters are

\a  a warning sound; \b  Delete the previous character; \c  ends with a newline symbol, \f, \v wraps but the cursor remains in its original position; \ n  wraps and the cursor moves to the beginning of the line; \ r   the cursor moves to the beginning of the line but does not wrap; \ t Insert   tab;\\   insert \ character; \nnn insert ASCII character represented by NNN (octal);

Script instance　　

 [[email protected] ~]# "  hello World   " hello world[[email protected]  ~]# echo -N  hello   " hello[[email protected]  ~]# [email  protected]  ~]# echo -e  " Span style= "color: #800000;" >hello\tworld   hello World  

#实现倒计时效果 #!/bin/bash for in 'seq3 -11'  do    echo  "\b\n$i"    sleep 1  Done

[Shell Foundation]--echo Command