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Top Forums Shell Programming and Scripting Please explain what this code is doing Post 302437527 by methyl on Thursday 15th of July 2010 09:42:02 AM
Old 07-15-2010
It is the logical AND operator. See "man test" (though it is usually implemented in the shell).
In your example all three conditions must be true for the result of the whole "test" to be true.

The condition can be paraphrased in this syntactically incorrect way:
Code:
((date +%w` -eq $2) AND (`date +%d` -ge $beg_dt) AND (`date +%d` -le $end_dt))

 

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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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