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Operating Systems Solaris Convert string (YYYYMMDD) format to date in Sun OS Post 303015087 by vgersh99 on Tuesday 27th of March 2018 02:30:19 PM
Old 03-27-2018
a bit verbose, but you could start here - isWed.sh:
Code:
#!/bin/bash

if [ ${#} -ne 1 ];then
   echo "invalid number of arguments : ${0} YYYYMMDD"
   exit 1
fi

d="${1}"
# wed from cal
dayOFweek=4

YEAR=${d%????}
DAY=${d#??????}
MON=${d#$YEAR}
MON=${MON%$DAY}
echo $YEAR/$MON/$DAY

dow=$(cal "${MON}" "${YEAR}" | awk -v day="${DAY}" '
  FNR==2 {split($0,daysA)}
  FNR > 2 {
    for(i=1; i <= NF; i++)
      if ( $i == day) {
        #printf("day->[%d] row->[%d]\n", $i, FNR-2)
        #printf("%d\n", (NF == 7 || FNR!=3) ? i-1 : i+(6-NF))
        printf("%d\n", (NF == 7 || FNR!=3) ? i : i+(6-NF)+1)
        exit
      }
  }
')

if [ ${dow} -eq ${dayOFweek} ]; then
   echo yes
else
   echo no
fi

isWed.sh 20180329
isWed.sh 20180328

Last edited by vgersh99; 03-27-2018 at 04:06 PM..
This User Gave Thanks to vgersh99 For This Post:
 

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COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME
column -- columnate lists SYNOPSIS
column [-tx] [-c columns] [-s sep] [file ...] DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file operands, or, by default, from the standard input. Empty lines are ignored. The options are as follows: -c Output is formatted for a display columns wide. -s Specify a set of characters to be used to delimit columns for the -t option. -t Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with the characters supplied using the -s option. Useful for pretty-printing displays. -x Fill columns before filling rows. Column exits 0 on success, >0 if an error occurred. ENVIRONMENT
COLUMNS The environment variable COLUMNS is used to determine the size of the screen if no other information is available. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY HH:MM/YEAR NAME " ; ls -l | sed 1d) | column -t SEE ALSO
colrm(1), ls(1), paste(1), sort(1) HISTORY
The column command appeared in 4.3BSD-Reno. BSD
June 6, 1993 BSD
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