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Full Discussion: echo on several lines
Top Forums Shell Programming and Scripting echo on several lines Post 302262227 by chebarbudo on Wednesday 26th of November 2008 04:55:34 PM
Old 11-26-2008
Thanks chatwizrd,
Can you be more explicit, I don't really understand you. The point is not to do all the actions together but one after the other. After each action is completed, I want to display a certain percentage on line one.
For example, here is a script named icandothat:
Code:
~# cat icandothat
action1() { echo 'doing action1...'; sleep 3; }
action2() { echo 'doing action2...'; sleep 5; }
action3() { echo 'doing action3...'; sleep 2; }
echo '0%   completed'
action1
echo '30%  completed'
action2
echo '80%  completed'
action3
echo '100% completed'

Here is the result of this script at different times (left) compared to the result of a so called script icannotdothat (right). The script I would like to be able to write is the script on the right.
T=0
Code:
~# icandothat                 ~# icannotdothat
0%   completed                0%   completed
doing action1...              doing action1...

T=3 seconds
Code:
~# icandothat                 ~# icannotdothat
0%   completed                30%  completed
doing action1...              doing action1...
30%  completed                doing action2...
doing action2...

T=8 seconds
Code:
~# icandothat                 ~# icannotdothat
0%   completed                80%  completed
doing action1...              doing action1...
30%  completed                doing action2...
doing action2...              doing action3...
80%  completed
doing action3...

T=10 seconds
Code:
~# icandothat                 ~# icannotdothat
0%   completed                100% completed
doing action1...              doing action1...
30%  completed                doing action2...
doing action2...              doing action3...
80%  completed                ~#
doing action3...
100% completed
~#

 

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LEARN ABOUT MOJAVE

aio_error

AIO_ERROR(2)						      BSD System Calls Manual						      AIO_ERROR(2)

NAME

     aio_error -- retrieve error status of asynchronous I/O operation (REALTIME)

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <aio.h>

     int
     aio_error(const struct aiocb *aiocbp);

DESCRIPTION

     The aio_error() system call returns the error status of the asynchronous I/O request associated with the structure pointed to by aiocbp.

RETURN VALUES

     If the asynchronous I/O request has completed successfully, aio_error() returns 0.  If the request has not yet completed, EINPROGRESS is
     returned.	If the request has completed unsuccessfully, the error status is returned as described in read(2), write(2), or fsync(2) is
     returned.	On failure, aio_error() returns -1 and sets errno to indicate the error condition.

ERRORS

     The aio_error() system call will fail if:

     [EINVAL]		The aiocbp argument does not reference an outstanding asynchronous I/O request.

SEE ALSO

     aio_cancel(2), aio_read(2), aio_return(2), aio_suspend(2), aio_write(2), fsync(2), read(2), write(2), aio(4)

STANDARDS

     The aio_error() system call is expected to conform to the IEEE Std 1003.1 (``POSIX.1'') standard.

HISTORY

     The aio_error() system call first appeared in FreeBSD 3.0.

AUTHORS

     This manual page was written by Wes Peters <wes@softweyr.com>.

BSD
								   June 2, 1999 							       BSD
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