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Full Discussion: nth date
Top Forums UNIX for Advanced & Expert Users nth date Post 302704313 by jim mcnamara on Friday 21st of September 2012 11:03:08 AM
Old 09-21-2012
try this: note it uses ksh - if you use bash uncomment the red code; comment the blue code and change the shebang to /bin/bash
Code:
#!/bin/ksh
#
# assumptions - the LAST friday means:
#       Find a Friday (not today, even if today is Friday) 
#         in the past
# number of days friday is in the past

set -A weekdays_dec 2 3 4 5 6 7 1
# in bash this is           
# declare -a weekdays_dec=( 2 3 4 5 6 7 1 )

decrement=${weekdays_dec[`date +%w`]}
# 86400 secs per day * decrement
decrement=$(( $decrement * 86400 ))

# 86400 secs per day * 50
fifty_days=$(( 86400 * 50 ))

when=`perl -e 'print time;'`
when=$(( $when - $fifty_days )) 

when=$(( $when - $decrement ))
answer=`perl -e 'use POSIX qw(strftime);
              $mt = strftime "%Y%m%d", localtime($ARGV[0]);
              print $mt;' $when`
echo $answer

Last edited by jim mcnamara; 09-21-2012 at 02:05 PM.. Reason: change code to meet specs.
This User Gave Thanks to jim mcnamara For This Post:
lijjumathew
 

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LEARN ABOUT MOJAVE

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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