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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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true(1) 						      General Commands Manual							   true(1)

NAME
true, false - Returns a standard exit value SYNOPSIS
true false STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: true: XCU5.0 false: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. DESCRIPTION
The true command returns a 0 (zero) exit value. The false command returns a nonzero exit value. These commands are usually used in input to shell commands. NOTES
The special built-in utility : (colon) is sometimes more efficient than the true command. EXIT STATUS
[Tru64 UNIX] The nonzero value returned by the false command may vary from system to system. EXAMPLES
To construct a loop in a shell procedure, enter: while true do date sleep 60 done This procedure displays the date and time once a minute. To stop it, press the Interrupt key sequence. SEE ALSO
Commands: csh(1), ksh(1), Bourne Shell sh(1b), POSIX shell sh(1p) Standards: standards(5) true(1)
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