Shell time operation (take the day before yesterday, etc)

1. get the Shell code for today's time $ date-d & quot; now & quot; + % Y-% m-% d2. get the Shell code for yesterday's time $ date-d & nb

1. obtain the current time

Shell code

1. $ Date-d "now" + % Y-% m-% d

 

2. take the time of yesterday

Shell code

1. $ Date-d "yesterday" + % Y-% m-% d
2. $ Date-d "1 days ago" + % Y-% m-% d

#-D, -- date = STRING display time described by STRING, not 'right'
STRING can be 'Now ', 'yesterday', or 'n days ago'
'N days ago 'indicates the day before n days

 

3. take the day before yesterday

Shell code

1. $ Date-d "2 days ago" + % Y-% m-% d

 

Effect display:

$ Date
Thursday, July 31, 2014 20:48:32 CST
$ Date-d "now" + % Y-% m-% d
2014-07-31
$ Date-d "yesterday" + % Y-% m-% d
2014-07-30
$ Date-d "2 days ago" + % Y-% m-% d
2014-07-29