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Top Forums Shell Programming and Scripting New to UNIX like 2 weeks of study only Post 302922708 by bakunin on Monday 27th of October 2014 09:58:51 PM
Old 10-27-2014
Quote:
Originally Posted by Gmoney93079
then if name is equal to name do nothing, but if name is != name do something
We have undestood that, but: "if name is equal to name" is true regardless of the value of "name", so the condition is moot. You could have written "if 1 equals 1" for the same effect.

For any if-else-decision to make sense there must be a condition which is sometimes true, sometimes not true. If it is always true or always not true, then you do not need a condition at all. If i say to you "if the time is in the evening then go to sleep, otherwise get up" there is a condition (what the time is) and sometimes this will be "in the evening", sometimes not, resulting in "get up" sometimes and in "go to sleep" otherwise.

What you do is "if the time is any time then get up" - but you do not need to refer to the time at all in such a case, because its value would be irrelevant anyways.

I hope this helps.

bakunin
 

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sleep(1)							   User Commands							  sleep(1)

NAME
sleep - suspend execution for an interval SYNOPSIS
sleep time DESCRIPTION
The sleep utility will suspend execution for at least the integral number of seconds specified by the time operand. OPERANDS
The following operands are supported: time A non-negative decimal integer specifying the number of seconds for which to suspend execution. EXAMPLES
Example 1: Suspending command execution for a time To execute a command after a certain amount of time: example% (sleep 105; command)& Example 2: Executing a command every so often example% while true do command sleep 37 done ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of sleep: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
The following exit values are returned: 0 The execution was successfully suspended for at least time seconds, or a SIGALRM signal was received (see NOTES). >0 An error has occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
wait(1), alarm(2), sleep(3C), wait(3UCB), attributes(5), environ(5), standards(5) NOTES
If the sleep utility receives a SIGALRM signal, one of the following actions will be taken: o Terminate normally with a zero exit status. o Effectively ignore the signal. The sleep utility will take the standard action for all other signals. SunOS 5.10 1 Feb 1995 sleep(1)
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