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9.3

I need a one-line UNIX shel command to add or subtract seconds or hours from a date.

Asked by INAUSA in Bourne Shell (sh), KornShell (ksh)

Tags: UNIX Shell Scripting

I need a one-line command to add or subtract seconds or hours from a date.  I have the pieces but I can't put them together in a one-line command.  I have to build this command on the fly in my EDI mapper so I can't write and execute a regular multi-line script from a .sh file.  It all has to fit on one line and called in one shot.  

Current time = 20081119 14:22

date +%s
1227122553

And then I can calculate a time 1 hour ago
expr 1227122553 - 3600
1227118953

and them put it back together as a date in proper format

date -d @1227118953 '+%Y%m%d %H:%M'
20081119 13:22


Now how do I string this into a one-line command to get the date, add/subtract x amount of seconds and then convert back to date format (ie: 20081119 12:21:14)?    

Something like this but this does't work - "date -d @ {expr date+%s - 3600} '+%Y%m%d %H:%M''"

[+][-]11/19/08 12:22 PM, ID: 22998097Accepted Solution

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About this solution

Zones: Bourne Shell (sh), KornShell (ksh)
Tags: UNIX Shell Scripting
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Solution Provided By: Tintin
Participating Experts: 2
Solution Grade: A
 
[+][-]11/19/08 01:01 PM, ID: 22998522Expert Comment

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