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Full Discussion: Problem in using AND OR condition together
Top Forums Shell Programming and Scripting Problem in using AND OR condition together Post 302346094 by methyl on Friday 21st of August 2009 03:33:56 AM
Old 08-21-2009
Mine and franklin52 solutions look similar but are actually very different.

franklin52 is using a "regular expression" - see "man 5 regexp" (and "man" for your shell) within a sub-shell (enclosed by parentheses) and testing the success or failure with the "&&" operative before using a "test" for the right hand side of the and.

I am just using a "test" - see "man 1 test" (and "man" for your shell) with parentheses overriding the default execution order of the ands and ors. Similar to a mathematical function. The parentheses are escaped so they will be passed to "test" rather than being actioned by the shell.


Thus the use of parentheses is totally different syntax, but the use of single square brackets to enclose a condition is similar.
 

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LEARN ABOUT OPENSOLARIS

_lwp_cond_signal

_lwp_cond_signal(2)						   System Calls 					       _lwp_cond_signal(2)

NAME

       _lwp_cond_signal, _lwp_cond_broadcast - signal a condition variable

SYNOPSIS

       #include <sys/lwp.h>

       int _lwp_cond_signal(lwp_cond_t *cvp);

       int _lwp_cond_broadcast(lwp_cond_t *cvp);

DESCRIPTION

       The _lwp_cond_signal() function unblocks one LWP that is blocked on the LWP condition variable pointed to by cvp.

       The _lwp_cond_broadcast() function unblocks all LWPs that are blocked on the LWP condition variable pointed to by cvp.

       If no LWPs are blocked on the LWP condition variable, then _lwp_cond_signal() and _lwp_cond_broadcast() have no effect.

       Both  functions	should	be called under the protection of the same LWP mutex lock that is used with the LWP condition variable being  sig-
       naled. Otherwise, the condition variable may be signalled between the test of the associated condition and  blocking  in  _lwp_cond_wait().
       This can cause an infinite wait.

RETURN VALUES

       Upon successful completion, 0 is returned. A non-zero value indicates an error.

ERRORS

       The _lwp_cond_signal() and _lwp_cond_broadcast() functions will fail if:

       EINVAL	 The cvp argument points to an invalid LWP condition variable.

       EFAULT	 The cvp argument points to an invalid address.

SEE ALSO

       _lwp_cond_wait(2), _lwp_mutex_lock(2)

SunOS 5.11							    8 Dec 1995						       _lwp_cond_signal(2)
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