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Full Discussion: How to convert hex numbers to decimal ?
Top Forums Shell Programming and Scripting How to convert hex numbers to decimal ? Post 302297451 by jack2 on Friday 13th of March 2009 12:43:29 PM
Old 03-13-2009
Quote:
Originally Posted by pludi
Please use [ code ][ /code ] (sans the space) for code/logs/listings/...
Code:
$ TIME=$( date +%s )
$ LANG=C date -ud @`echo $TIME`
Fri Mar 13 14:37:15 UTC 2009
$ SEC=$(( ${TIME} % 60 ))
$ MIN=$(( ${TIME} % 3600 / 60 ))
$ HR=$(( ${TIME} % (3600*24) / 3600 ))
$ echo $HR $MIN $SEC
14 37 15
$
$
$ SIZE=$(( 200*1024*1024 ))
$ KB=$(( ${SIZE} / 1024 ))
$ MB=$(( ${SIZE} / 1024 / 1024 ))
$ GB=$(( ${SIZE} / 1024 / 1024 / 1024 ))
$ BITS=$(( ${SIZE} * 8 ))
$ echo $GB $MB $KB $SIZE $BITS
0 200 204800 209715200 1677721600
$

This code worked both on Linux/HP-UX using bash/ksh on both (except for the second date call, HP-UX' date doesn't like the -d switch). As for the Base-16 to Base-10 conversion, it's probably easier to do that in Perl than to code in in the shell.
Hi,

in my case
running
$ time=$( date +%s )
$ lang=c dat -ud @`echo $time`
generated
date: invalid date `@103798`

Jack
 

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truncate

TRUNCATE(1)                                                        User Commands                                                       TRUNCATE(1)

NAME

       truncate - shrink or extend the size of a file to the specified size

SYNOPSIS

       truncate OPTION... FILE...

DESCRIPTION

       Shrink or extend the size of each FILE to the specified size

       A FILE argument that does not exist is created.

       If  a  FILE  is  larger than the specified size, the extra data is lost.  If a FILE is shorter, it is extended and the extended part (hole)
       reads as zero bytes.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --no-create
              do not create any files

       -o, --io-blocks
              treat SIZE as number of IO blocks instead of bytes

       -r, --reference=RFILE
              base size on RFILE

       -s, --size=SIZE
              set or adjust the file size by SIZE bytes

       --help display this help and exit

       --version
              output version information and exit

       The SIZE argument is an integer and optional unit (example: 10K is 10*1024).  Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,... (pow-
       ers of 1000).

       SIZE  may also be prefixed by one of the following modifying characters: '+' extend by, '-' reduce by, '<' at most, '>' at least, '/' round
       down to multiple of, '%' round up to multiple of.

AUTHOR

       Written by Padraig Brady.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report truncate translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       dd(1), truncate(2), ftruncate(2)

       Full documentation at: <http://www.gnu.org/software/coreutils/truncate>
       or available locally via: info '(coreutils) truncate invocation'

GNU coreutils 8.28                                                 January 2018                                                        TRUNCATE(1)
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