Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Subtract -1 from a date in Unix script Post 302371007 by ghostdog74 on Friday 13th of November 2009 06:02:58 AM
Old 11-13-2009
gawk
Code:
fromdate="07/13/2009"
yesterday=$( awk -v fd="$fromdate" 'BEGIN{
  m=split(fd,date,"/")
  t=mktime(date[3]" "date[1]" "date[2]" 0 0 0")
  yesterday=strftime("%d/%m/%Y",t-86400)
  print yesterday  
}' )
echo $yesterday

output
Code:
# ./shell.sh
12/07/2009

 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to subtract 2 hours from 'date' in shell ( /bin/sh ) script ?

I write a sh script that zip and copy to tape all files that older then 2 hours. 1. The way I choose is - touch a file with "now - 2 hours", then use fine with '! -newer' 2. Do you have any other idea to do it ? tnx. (1 Reply)
Discussion started by: yairon
1 Replies

2. Shell Programming and Scripting

Subtract two date in unix

I Have a long file like this 123122312 05/06/12 123123456 05/06/14 I want to take the difference of dates in two lines & print difference sidewise for the whole long files. Pl help me out. (1 Reply)
Discussion started by: vanand
1 Replies

3. UNIX for Advanced & Expert Users

Subtract 2 months from the date

I have the script which appends month and year to the name of the file. Now every time when I append the month-year combination I have to subtract 2 months from the current date and then append it, since we are sending our vendor 2 months prior worth of data eveytime. #! /usr/bin/ksh ... (5 Replies)
Discussion started by: mahekr2000
5 Replies

4. Shell Programming and Scripting

Date command - subtract from given time

the given time is: 12:13:00 how do i subtract a 10 minutes from any given time? date '12:13:00' '-10 min' also tried this: date +12:13:00 '-10 min' (2 Replies)
Discussion started by: SkySmart
2 Replies

5. Shell Programming and Scripting

Subtract date in a loop

I have a file with name and date--- $ cat file.log userA 01-06-2014 userB 25-05-2014 userC 16-05-2014 userC 01-03-2014 I want to search for the current date and get the name for that date. If current date is not found, go back 1 day and search and so on till it finds the... (2 Replies)
Discussion started by: Nagesh_1985
2 Replies

6. UNIX for Dummies Questions & Answers

Subtract minutes from date

Hi, I am reading a particular date from a file using below command WFLWDATE=$(sed '2q;d' FileA.prm) The echo command outputs the correct date in variable WFLWDATE Now I want to subtract 5 minutes from this variable. I am on AIX and unable to get anything working as expected. Can you... (1 Reply)
Discussion started by: vrupatel
1 Replies

7. Shell Programming and Scripting

Subtract months/days from date

Hi, Can you please let me know code for the below (in korn shell) a) Subtract month(s) from given date b) Subtract day(s) from give date c) Subtract month(s) from given timestamp d) Subtract day(s) from give timestamp (1 Reply)
Discussion started by: tostay2003
1 Replies

8. Shell Programming and Scripting

Subtract a file's modification date with current date

SunOS -s 5.10 Generic_147440-04 sun4u sparc SUNW,SPARC-Enterprise Hi, In a folder, there are files. I have a script which reads the current date and subtract the modification date of each file. How do I achieve this? Regards, Joe (2 Replies)
Discussion started by: roshanbi
2 Replies

9. HP-UX

awk command in hp UNIX subtract 30 days automatically from current date without date illegal option

current date command runs well awk -v t="$(date +%Y-%m-%d)" -F "'" '$1 < t' myname.dat subtract 30 days fails awk -v t="$(date --date="-30days" +%Y-%m-%d)" -F "'" '$1 < t' myname.dat awk command in hp unix subtract 30 days automatically from current date without date illegal option error... (20 Replies)
Discussion started by: kmarcus
20 Replies
YESTERDAY(1)						      General Commands Manual						      YESTERDAY(1)

NAME
yesterday - print file names from the dump SYNOPSIS
yesterday [ -c ] [ -date ] files ... DESCRIPTION
Yesterday prints the names of the files from the most recent dump. Since dumps are done early in the morning, yesterday's files are really in today's dump. For example, if today is March 17, 1992, yesterday /adm/users prints /n/dump/1992/0317/adm/users In fact, the implementation is to select the most recent dump in the current year, so the dump selected may not be from today. With option -c, yesterday copies the dump file to the current directory. The date option selects other day's dumps, with a format of 2, 4, 6, or 8 digits of the form dd, mmdd, yymmdd, or yyyymmdd. Yesterday does not guarantee that the string it prints represents an existing file. EXAMPLES
Back up to yesterday's MIPS binary of vc: cd /mips/bin yesterday -c vc Temporarily back up to March 1's MIPS C library to see if a program runs correctly when loaded with it: bind `{yesterday -0301 /mips/lib/libc.a} /mips/lib/libc.a rm v.out mk v.out FILES
/n/dump SOURCE
/rc/bin/yesterday SEE ALSO
fs(4) BUGS
It's hard to use this command without singing. YESTERDAY(1)
All times are GMT -4. The time now is 04:08 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy