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Full Discussion: How to correctly use an echo inside an echo?
Top Forums UNIX for Dummies Questions & Answers How to correctly use an echo inside an echo? Post 302354802 by raja_kolluru on Saturday 19th of September 2009 11:40:18 PM
Old 09-20-2009
Quote:
Originally Posted by mokachoka
Bit of a weird one i suppose, i want to use an echo inside an echo... For example...

i have a script that i want to use to take users input and create another script. Inside this script it creates it also needs to use echos...

echo "echo "hello"" >$file
echo "echo "goodbye"" >$file

Why is this not correct?

Thanks.
A few observations here:
1. As suggested earlier, either "escape" the double quotes surrounding "hello" or use single quote i.e. use
Code:
 echo "echo \"Hello\" "
or echo "echo 'hello' "

2. By doing >$file two times the second echo (i.e. good bye) will over write $file. Instead use
Code:
 echo "echo 'goodbye'" >> $file

to append the contents of the echo into the file.
3. It is a best practice to refrain from creating elaborate scripts using the echo command. Instead use shell "here documents"
Code:
cat <<! > $file
echo "Hello" 
echo "Good bye" 
!

is certainly a lot cleaner.
 

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LEARN ABOUT OPENSOLARIS

noecho

echo(3XCURSES)						  X/Open Curses Library Functions					    echo(3XCURSES)

NAME

       echo, noecho - enable/disable terminal echo

SYNOPSIS

       cc [ flag... ] file... -I /usr/xpg4/include  -L	/usr/xpg4/lib 
	-R  /usr/xpg4/lib  -lcurses  [ library... ]

       c89 [ flag... ] file... -lcurses [ library... ]

       #include <curses.h>

       int echo(void);

       int noecho(void);

DESCRIPTION

       The  echo()  function enables Echo mode for the current screen. The noecho() function disables Echo mode for the current screen. Initially,
       curses software echo mode is enabled and hardware echo mode of the tty driver is disabled. The echo() and noecho() functions control  soft-
       ware echo only. Hardware echo must remain disabled for the duration of the application, else the behavior is undefined.

RETURN VALUES

       Upon successful completion, these functions return OK. Otherwise, they return ERR.

ERRORS

       No errors are defined.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       getch(3XCURSES), getstr(3XCURSES), initscr(3XCURSES), libcurses(3XCURSES), scanw(3XCURSES), attributes(5), standards(5)

SunOS 5.11							    5 Jun 2002							    echo(3XCURSES)
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