Script to get last working date

Shell Programming and Scripting
1

Problem : we need a command that will give previous day date and previous day should be mon-fri only.
Example :if we are running a command on Monday , it will give Friday �s date not Sunday�s .
Few more restrictions :

  1. Command should be working in NM n/w.
  2. Hard coding of date should be avoided.
  3. Command will be running on NM and market holidays also .
  4. Avoid the use of sysin or other static file .

I created a .sh script. The code is given below.

  
 #!/bin/bsh
  
 if [ date '+%w' ==1 ]; then
    date -v -3d + '%Y/%m/%d'
 else
    date -v - 1d + '%Y/%m/%d'
 fi

When I execute this script I get the following error

 
 date: illegal option --v

Please could a unix expert provide some insights.

2

Hello Downsouth,

Welcome to forum, please use code tags for commands/inputs/codes which you use in your posts as per forum rules. Following may help you in same.

cat check_day.ksh
if [[ `date -d "1 day ago" +%A` == "Sunday" ]]
then
        PRE_VAL=`date -d "3 day ago"`
elif [[ `date -d "1 day ago" +%A` == "Saturday" ]]
then
        PRE_VAL=`date -d "2 day ago"`
else
        PRE_VAL=`date -d "1 day ago"`
fi
echo $PRE_VAL " is the previous day."

Here name of the script is check_day.ksh .
When I execute it on my system following is the output.

 ./check_day.ksh
Fri Sep 4 07:58:17 EDT 2015  is the previous day.

Thanks,
R. Singh

3

Well, i suggest:

date -v
date: invalid option -- 'v'
Try 'date --help' for more information.

Meaning, remove that invalid option and try again.

4

Hi Ravinder,

Thanks for the reply. I get the following error.

Syntax error '==' unexpected
5

Hello Downsouth,

Could you please check your date's command version by doing date --version as suggestion I gave will be for GNU dates. Also please mention your os details too(you can hide your box name but can provide version details and os name etc).

Thanks,
R. Singh

6

HP-UX cadaman B.11.31 U ia64

date --version returned
 date [-u]
 date [-a]
7

I wonder if its not your shell syntax... It is maybe expecting != for a "Not equal" and = for equal ( or "matches" as you prefer...)

8

Missed that part:

_#!/bin/bsh
  
 if [ date '+%w' ==1 ]; then

Should become:

#!/bin/bash
  
 if [ $(date '+%w') = 1 ]; then

hth

9

I tried = instead of ==. Even that did not work. My script name is Priorworkday.ksh. When I execute it I get the error interpreter "/bin/bash: not found file link resolves to "/usr/bin/bash"

10

Well then, use ksh instead of bsh/bash for the shebang.

11

tried it doesn't work. Date issues start popping up

12

Did you note that you have a leading space before the shebang?
The leading hash (#) is a must, while the explamation mark (!) is optional.

Try one of these:

#!/bin/ksh
#!/usr/bin/ksh
#!/usr/bin/env ksh

What is the error message regarding the Date issues ?

ty & hth