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Full Discussion: Bash Scripting with date format conversion
Top Forums Shell Programming and Scripting Bash Scripting with date format conversion Post 302974281 by stomp on Friday 27th of May 2016 07:56:26 AM
Old 05-27-2016
So you you want to make a filename conversion like this:

Code:
INPUT    : postwrf_d01_YYYYMMDD_ZZZZ_f0HHHH.grb2
OUTPUT 1 :         d01_YYYYMMDD_ZZZZ_f0HHHH.grb2
OUTPUT 2 :             YYYYMMDD_ZZZZ_f0HHHH.gr2 
OUTPUT 3 :    nwp.TC23.YYYYMMDDZZ.f0MMMM

I suggest you capture the wanted subgroups e. g. with sed and then reassemble the string for the different needs.

Code:
#!/bin/bash
FILENAME="postwrf_d01_20160527_0600_f01000.grb2"
set $( echo "$filename"  \
   | sed -r -e 's/^postwrf_d01_([0-9]{4})([0-9]{2})([0-9]{2})_([0-9]{4})_f0([0-9]{4}).grb2$/\1 \2 \3 \4 \5/'  )
YYYY="$1"
MM="$2"
DD="$3"
ZZZZ="$4"
HHHH="$5"

OUTPUT_1= "d01_${YYYY}${MM}${DD}_${ZZZZ}_f0${HHHH}.grb2"

# Now calculate the hour to minutes with the (( )) function. (See man bash for arithmetic evaluation).
((MINUTES=....))
# For leading zeros you may need to use printf. 
MINUTES=$(printf "%04d" $MINUTES)

Last edited by stomp; 05-27-2016 at 01:37 PM..
This User Gave Thanks to stomp For This Post:
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LEARN ABOUT SUSE

bashbug

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)
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