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Compare Start date and End date...

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# 1  
Old 03-11-2011
Compare Start date and End date...
Hi All,

I have problem in my file. It has two date variable.

There are 2 variables which has the values as below
1. START_MONTH = “Date(YYYYMM) format” Ex: 201008
2. END_MONTH = “Date(YYYYMM) format” Ex: 201105

The end date should be greater than start date.

Now we need to validate
1. Length =6
2. Whether all are valid digits[0-9] and not alphabets like this (incorrect date Ex: 20ert4)
3. Whether the month is between 1-12 (ie) the last digits must be between 1-12 . (incorrect date Ex: 201031)
4. The year should start with 2.
5.
help me how to achive this logic...
# 2  
Old 03-11-2011
try:
Code:
 [ ${#START} -eq 6 ] && [ ${START:0-2} -ge 1 ] && [ ${START:0-2} -le 12 ]&& [ ${START:0:1} -eq 2 ] && [ ${START//[0-9]/x} = "xxxxxx" ] && echo "correct form" || echo "wrong form"

# 3  
Old 03-11-2011
Hi yinyuemi,

Thx for your response. Can you explain the command what it does? It will be really helpful for me
# 4  
Old 03-11-2011
I'm not good at English, so I recomend you a website to help you understand the code,
Parameter Substitution
Sorry for this.
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