Sponsored Content
Full Discussion: Date Substraction
Top Forums UNIX for Dummies Questions & Answers Date Substraction Post 1739 by mib on Wednesday 28th of March 2001 04:54:51 AM
Old 03-28-2001
Code:
#!/bin/bash

# figure out what yesterday was.
date '+%Y %m %d' |
 {
 read year month day

 day=`expr "$day" - 1`
 case "$day" in
 0)
 month=`expr "$month" - 1`
 case "$month" in
 0)
 month=12
 year=`expr "$year" - 1`
 ;;
 esac

 day=`cal $month $year | grep . | fmt -1 | tail -1`
 esac

 echo "Yeseterday was: $day $month $year"
                 }


Last edited by Yogesh Sawant; 05-20-2010 at 10:53 AM.. Reason: added code tags
 

9 More Discussions You Might Find Interesting

1. Solaris

Substraction in bash

Hi all, I have in one script something like this: FIRSTOCC=`grep -n ORA- alert_bill2.log |tail -"$ROWS"|head -1|cut -d: -f1` TOTAL=`more alert*|wc -l` DIFFERENCE=`$TOTAL-$FIRSTOCC` echo Total lines in alert_bill = $TOTAL echo $DIFFERENCE How do I make this substraction work? Thk (2 Replies)
Discussion started by: mclaudiu
2 Replies

2. Shell Programming and Scripting

Date One Week Ago From Given Date, Not From Current Date

Hi all, I've used various scripts in the past to work out the date last week from the current date, however I now have a need to work out the date 1 week from a given date. So for example, if I have a date of the 23rd July 2010, I would like a script that can work out that one week back was... (4 Replies)
Discussion started by: Donkey25
4 Replies

3. Shell Programming and Scripting

date substraction

hello i have obtained the current date .. current_date=date "+%m/%d%y" and i have another date ,stored in my log file which i have already retrieved. i want to store the subtraction in a varible called diff. diff=log_date - currentdate ex: log_date=01/28/11 current_date=... (3 Replies)
Discussion started by: urfrnddpk
3 Replies

4. Shell Programming and Scripting

Problem in algebraic substraction

my code is like this count=`cat /filecount.txt | tail -1 |head -1| awk '{print $1}'` ###file is having value 264 #### echo "actual count = $count" exact_count=`expr $value \* 24` echo "exact_count= $exact_count" diff=`expr "$exact_count" - "$count"` a= exact_count - count ... (8 Replies)
Discussion started by: sagar_1986
8 Replies

5. Shell Programming and Scripting

Converting a date to friday date and finding Min/Max date

Dear all, I have 2 questions. I have a file with many rows which has date of the format YYYYMMDD. 1. I need to change the date to that weeks friday date(Ex: 20120716(monday) to 20120720). Satuday/Sunday has to be changed to next week friday date too. 2. After converting the date to... (10 Replies)
Discussion started by: 2001.arun
10 Replies

6. Shell Programming and Scripting

Substraction in shell scripting

Hello friends, I am new on linux, i am facing issues on below script. #!/bin/sh current=1355147377 echo $current last_modified=1354537347 echo $last_modified DIFF='expr ($current - $last_modified)' echo $DIFF Please view this code tag video for how to use code tags when posting... (8 Replies)
Discussion started by: sanjay833i
8 Replies

7. Shell Programming and Scripting

Substraction of matching lines from a file.

I have 2 files: file1.txt contains /html/mybook/Charts/143712/reptiles.pdf /html/mybook/Charts/198459/spices.pdf /html/mybook/Charts/198459/fresh_nuts.pdf /html/mybook/Charts/123457/dome_anim.pdf /html/mybook/Charts/123457/vegetables.pdf /html/content/3DInteractive/174091/CSPSGGB.html ... (6 Replies)
Discussion started by: Jojan Paul
6 Replies

8. Shell Programming and Scripting

Date: invalid date trying to set Linux date in specific format

i try to set linux date & time in specific format but it keep giving me error Example : date "+%d-%m-%C%y %H:%M:%S" -d "19-01-2017 00:05:01" or date +"%d-%m-%C%y %H:%M:%S" -d "19-01-2017 00:05:01" keep giving me this error : date: invalid date ‘19-01-2017 00:05:01' Please use CODE tags... (7 Replies)
Discussion started by: umen
7 Replies

9. UNIX for Beginners Questions & Answers

Compare date in .txt with system date and remove if it's lesser than system date

Can someone help me with the code wherein there is a file f1.txt with different column and 34 column have expiry date and I need to get that and compare with system date and if expiry date is <system date remove those rows and other rows should be moved to new file f2.txt . I don't want to delete... (2 Replies)
Discussion started by: Stuti
2 Replies
DATE(1) 						      General Commands Manual							   DATE(1)

NAME
date - print or set the date and time SYNOPSIS
date [-qsu] [[MMDDYY]hhmm[ss]] [+format] OPTIONS
-q Read the date from stdin -s Set the time (implicit for -q or a date string) -u Print the date as GMT -t Use this number of seconds instead of current time EXAMPLES
date # Print the date and time date 0221921610 # Set date to Feb 21, 1992 at 4:10 p.m. DESCRIPTION
With the -q flag or a numeric argument, date sets the GMT time and date. MMDDYY refers to the month, day, and year; hhmmss refers to the hour, minute and second. Each of the six fields must be exactly two digits, no more and no less. date always display the date and time, with the default format for the system. The -u flag request GMT time instead of local time. A format may be specified with a + followed by a printf-like string with the following options: %% % character %A Name of the day %B Name of the month %D mm/dd/yy %H Decimal hour on 2 digits %I Decimal hour modulo 12 on 2 digits %M Decimal minute on 2 digits %S Decimal seconds on 2 digits %T HH:MM:SS %U Decimal week number, Sunday being first day of week %W Decimal week number, Monday being first day of week %X Same as %T %Y Decimal year on 4 digits %Z Time Zone (if any) %a Abbreviated name of the day %b Abbreviated name of the month %c Appropriate date & time (default format) %d Decimal day of the month on 2 digits %e Same as %d, but a space replaces leading 0 %h Same as %b %j Decimal dey of the year on 3 digits %m Decimal month on 2 digits %n Newline character %p AM or PM %r 12-hour clock time with AM/PM %s Number of seconds since the epoch %t Tab character %w Decimal day of the week (0=Sunday) %x Same as %D %y Decimal year on 2 digits SEE ALSO
time(2), ctime(3), readclock(8). DATE(1)
All times are GMT -4. The time now is 09:11 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy