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Top Forums Programming Unix Shell background processing Post 302457751 by Corona688 on Tuesday 28th of September 2010 05:42:26 PM
Old 09-28-2010
Please don't PM me in the hope of a faster response. I am not on-call here.

On my system I get:

Code:
myshell> echo a
a
0DEBUG:Child Finished
myshell> echo a &
1myshell> a

It does print 'myshell' again. And then 'echo' stomps on it and moves to the next line. This is normal. Since we're not waiting for it, the background process can't be polite about when it prints what... Also watch where you're cout-ing BG, if the process is backgrounded it kind of just shoves it in there anyway.

In a real shell try
Code:
$ ( sleep 3 ; echo asdf ) &


Last edited by Corona688; 09-28-2010 at 06:49 PM..
 

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echo(1) 						      General Commands Manual							   echo(1)

NAME
echo - echo (print) arguments SYNOPSIS
[arg] ... DESCRIPTION
writes its arguments separated by blanks and terminated by a new-line on the standard output. It also understands C-like escape conven- tions; beware of conflicts with the shell's use of write an alert character backspace print line without appending a new-line form-feed new-line carriage return tab vertical tab backslash the 8-bit character whose ASCII code is the 1-, 2-, 3- or 4-digit octal number n, whose first character must be a zero. write an 8-bit value that is the zero-, one-, two- or three-digit octal number num is useful for producing diagnostics in command files and for sending known data into a pipe. Notes Berkeley differs from this implementation. The former does not implement the backslash escapes. However, the semantics of the escape can be obtained by using the option. The echo command implemented as a built-in function of follows the Berkeley semantics (see csh(1)). EXTERNAL INFLUENCES
Environment Variables determines the interpretation of arg as single and/or multi-byte characters. If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari- able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multi-byte character code sets are supported. AUTHOR
was developed by OSF and HP. SEE ALSO
sh(1). BUGS
No characters are printed after the first This is not normally a problem. STANDARDS CONFORMANCE
echo(1)
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