Linux Script- Date Manipulations

Question

I will set one date variable(Say \'08-JUN-2011\') and I want to do some calculations based on that date namely,
1. Have to get the first day of the given day\'s month.

Answer 1

As you're using Linux, hhopefully you have the GNU date utility available. It can handle almost any description of a relative date that you think of.

Here are some examples

date --date="last month" +%Y-%m-%d
date --date="yesterday" +%Y-%m-%d
date --date="last month" +%b
x=$(date --date "10 days ago" +%Y/%m/%d)

To learn more about it see GNU Date examples

Once you use it some, you can shortcut your information gathering with date --help, which shows all the basic options (but is sometimes is hard to interpret.)

I hope this helps.