11-06-2017
Quote:
Originally Posted by
MadeInGermany
Hmm I think asynchronous background jobs MUST go to separate logs.
Otherwise they might overwrite each other, and the shared log file becomes a mess.
Note that in the code I suggested in post #8, the output to the single log file is produced by a single invocation of the
printf utility that uses an append redirection operator (
>>) instead of the overwrite redirection operator (
>) that was in the original code. Although not required by the standards, I would expect the output of that invocation of
printf to be produced by a single
write() system call, which, when writing the amount of data shown in the examples to a regular file, should be an atomic operation. Using the append redirection should prevent the concurrent background processes from overwriting each other's output and the single
printf instead of multiple
echos should keep the output from the various background processes from being intermixed.
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ECHO(1) BSD General Commands Manual ECHO(1)
NAME
echo -- write arguments to the standard output
SYNOPSIS
echo [-n] [string ...]
DESCRIPTION
The echo utility writes any specified operands, separated by single blank (' ') characters and followed by a newline ('
') character, to the
standard output.
The following option is available:
-n Do not print the trailing newline character.
The end-of-options marker -- is not recognized and written literally.
The newline may also be suppressed by appending 'c' to the end of the string, as is done by iBCS2 compatible systems. Note that the -n
option as well as the effect of 'c' are implementation-defined in IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002. For porta-
bility, echo should only be used if the first argument does not start with a hyphen ('-') and does not contain any backslashes (''). If
this is not sufficient, printf(1) should be used.
Most shells provide a builtin echo command which tends to differ from this utility in the treatment of options and backslashes. Consult the
builtin(1) manual page.
EXIT STATUS
The echo utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
builtin(1), csh(1), printf(1), sh(1)
STANDARDS
The echo utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as amended by Cor. 1-2002.
BSD
November 12, 2010 BSD