Sponsored Content
Top Forums Shell Programming and Scripting Need help with date arithmetic please Post 303000271 by RudiC on Friday 7th of July 2017 03:43:00 PM
Old 07-07-2017
You might like this for the leap year stuff:
Code:
function mthdays { TA=312831303130313130313031; printf "%d\n" $(( ${TA:($1-1)*2:2} + ($1!=2?0:!($2%4) && ($2%100) || !($2%400)))); }
echo $(mthdays 2 2016)
29
echo $(mthdays 2 2015)
28

For the function definition, you need to switch off bash's history : set +H
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

time arithmetic

Can anyone help please. I am writing a kourne shell script and I am unsure how to do the following: I have extracted a time string from a logfile, and I have another time string I want to compare it to to see if it's later than the time I'm comparing with. i.e. expectedSLA="23:00:00", ... (2 Replies)
Discussion started by: csong2
2 Replies

2. UNIX for Dummies Questions & Answers

arithmetic problem

i am used to making scripts for hp-ux. but lately i tried to make some for solaris. the problem is that when i tried to execute it it gave me an error the "let: not found". why is that? how can i perform an arithmetic function in the solaris shell script? thanks :) (2 Replies)
Discussion started by: inquirer
2 Replies

3. Shell Programming and Scripting

arithmetic in ksh

Helloo.. I am trying one very simple thing I could not find anything on google.. I have 2 integer variable..and I need to do division...in ksh where $catch and $num are integer variable.. I tryed with this: printf "%0.2f" $final=$catch/$num but it does not work.. any help is... (12 Replies)
Discussion started by: amon
12 Replies

4. Shell Programming and Scripting

How to perform arithmetic operation on date

Hi all, I would appreciate if anyone knows how to perform adding to date. As for normal date, i can easily plus with any number. But when it comes to month end say for example 28 Jun, i need to perform a plus with number 3, it will not return 1 Jul. Thanks in advance for your help. (4 Replies)
Discussion started by: agathaeleanor
4 Replies

5. Shell Programming and Scripting

Arithmetic on timestamps

Hi Friends, please advise on shell script to add two time stamps for example : a=12:32 b=12:00 c=a+b=00:32 please help me to find shell script to add to two time stamps, as i need to convert time from EST to GMT or SST to prepare status of jobs in unix and to specify estimated time to... (3 Replies)
Discussion started by: balireddy_77
3 Replies

6. UNIX for Dummies Questions & Answers

Arithmetic: how to??

Hello all, I'd like to know how to perform arithmetic on multiple files. I have got many tab-delimited files. Each file contains about 2000 rows and 2000 columns. What I want to do is to to sum the values in each row & column in every file. The following explains what I want to do; ... (9 Replies)
Discussion started by: Muhammad Rahiz
9 Replies

7. Shell Programming and Scripting

Date and time Arithmetic

Hi, I need to process a file which contains below data. Usually the files contains both Start and Finish time. but for Few records, it contains only Start. For those records I need to add the finish line by adding 5 minutes to Start time. Started BBIDX Tue Jun 1 15:15:11 EDT 2010 292308... (1 Reply)
Discussion started by: siba.s.nayak
1 Replies

8. Post Here to Contact Site Administrators and Moderators

Broken link FAQ date arithmetic with shell

page unix com/answers-frequently-asked-questions/13785-yesterdays-date-date-arithmetic.html Date Arithmetic with the Shell has link of www samag com/documents/s=8284/sam0307b/0307b.htm which is no longer. Is this the correct place to post this?:confused: and I got message... (1 Reply)
Discussion started by: dgerman
1 Replies

9. Shell Programming and Scripting

Help needed with some date arithmetic

I have a file (main.lst) containing a list of dates in DDMMYYYY format. The dates will mostly be the same but it is possible to have multiple dates and these need not be in chronological order. I have another file containing another list of dates (holidays.lst). The task is to get the latest... (5 Replies)
Discussion started by: elixir_sinari
5 Replies

10. Shell Programming and Scripting

Arithmetic with bash

I need to divide the number of white spaces by total number of characters in a file using bash. I am able to get the number of white spaces correctly using: tr -cd < afile | wc -c I am also able to get the total number of characters using: wc -c afile How do I divide the first... (2 Replies)
Discussion started by: ngabrani
2 Replies
SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME
shtool-echo - GNU shtool echo(1) extensional command SYNOPSIS
shtool echo [-n|--newline] [-e|--expand] string DESCRIPTION
shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the gory details needed to find out the environment details under option -e. OPTIONS
The following command line options are available. -n, --newline By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is omitted. -e, --expand If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the following constructs are recognized: %B switch terminal mode to bold display mode. %b switch terminal mode back to normal display mode. %u the current user name. %U the current user id (numerical). %g the current group name. %G the current group id (numerical). %h the current hostname (without any domain extension). %d the current domain name. %D the current day of the month. %M the current month (numerical). %m the current month name. %Y the current year. EXAMPLE
# shell script shtool echo -n -e "Enter your name [%B%u%b]: "; read name shtool echo -e "Your Email address might be %u@%h%d" shtool echo -e "The current date is %D-%m-%Y" HISTORY
The GNU shtool echo command was originally written by Ralf S. Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML) under the name buildinfo. It was later taken over into GNU shtool. SEE ALSO
shtool(1), echo(1). 18-Jul-2008 shtool 2.0.8 SHTOOL-ECHO.TMP(1)
All times are GMT -4. The time now is 09:53 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy