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Full Discussion: Yesterday in UNIX
Top Forums UNIX for Advanced & Expert Users Yesterday in UNIX Post 302935282 by disedorgue on Saturday 14th of February 2015 09:10:35 AM
Old 02-14-2015
Hi,
with awk (work fine between 1901 and 2099):
Code:
awk -F/ '{($3 == 1) ? ($2 == 1) ? $0=$1-1"/12/31" : ($2 == 3) ? (($1 % 4)==0) ? $0=$1"/2/29" : $0=$1"/2/28" : ($2 == 2 || $2 == 4 || $2 == 6 || $2 == 8 || $2 == 9 || $2 == 11) ? $0=$1"/"$2-1"/31" : $0=$1"/"$2-1"/30" : $0=$1"/"$2"/"$3-1 ; printf("%04d%02d%02d\n",$1,$2,$3)}'

and example:
Code:
for i in "2016/03/01" "2015/01/01" "2015/02/01" "2015/03/01" "2015/04/01" "2015/05/01" "2015/06/01" "2015/07/01" "2015/08/01" "2015/09/01" "2015/10/01" "2015/11/01" "2015/12/01"
do
echo $i | awk -F/ '{($3 == 1) ? ($2 == 1) ? $0=$1-1"/12/31" : ($2 == 3) ? (($1 % 4)==0) ? $0=$1"/2/29" : $0=$1"/2/28" : ($2 == 2 || $2 == 4 || $2 == 6 || $2 == 8 || $2 == 9 || $2 == 11) ? $0=$1"/"$2-1"/31" : $0=$1"/"$2-1"/30" : $0=$1"/"$2"/"$3-1 ; printf("%04d%02d%02d\n",$1,$2,$3)}'
done
20160229
20141231
20150131
20150228
20150331
20150430
20150531
20150630
20150731
20150831
20150930
20151031
20151130

Regards.
 

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LEARN ABOUT XFREE86

securetty

SECURETTY(5)						     Linux Programmer's Manual						      SECURETTY(5)

NAME

       securetty - file which lists terminals from which root can log in

DESCRIPTION

       The file /etc/securetty contains the names of terminals (one per line, without leading /dev/) which are considered secure for the transmis-
       sion of certain authentication tokens.

       It is used by (some versions of) login(1) to restrict the terminals on which root is allowed to login.  See login.defs(5) if  you  use  the
       shadow suite.

       On  PAM	enabled  systems,  it  is  used  for  the  same purpose by pam_securetty(8) to restrict the terminals on which empty passwords are
       accepted.

FILES

       /etc/securetty

SEE ALSO

       login(1), login.defs(5), pam_securetty(8)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2015-03-29							      SECURETTY(5)
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