07-09-2009
Can we increment or decrement a date value?
export a=`date`
a=`expr $a + 1`
Is it possible?
if not how can i increment or decrement a date variable?
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LEARN ABOUT OPENSOLARIS
incr
incr(1T) Tcl Built-In Commands incr(1T)
__________________________________________________________________________________________________________________________________________________
NAME
incr - Increment the value of a variable
SYNOPSIS
incr varName ?increment?
_________________________________________________________________
DESCRIPTION
Increments the value stored in the variable whose name is varName. The value of the variable must be an integer. If increment is supplied
then its value (which must be an integer) is added to the value of variable varName; otherwise 1 is added to varName. The new value is
stored as a decimal string in variable varName and also returned as result.
EXAMPLES
Add one to the contents of the variable x:
incr x
Add 42 to the contents of the variable x:
incr x 42
Add the contents of the variable y to the contents of the variable x:
incr x $y
Add nothing at all to the variable x (often useful for checking whether an argument to a procedure is actually numeric and generating an
error if it is not):
incr x 0
SEE ALSO
expr(1T)
KEYWORDS
add, increment, variable, value
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Availability | SUNWTcl |
+--------------------+-----------------+
|Interface Stability | Uncommitted |
+--------------------+-----------------+
NOTES
Source for Tcl is available on http://opensolaris.org.
Tcl incr(1T)