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Full Discussion: Please help - Command to Subtract two numbers without losing prefix zeros
Top Forums Shell Programming and Scripting Please help - Command to Subtract two numbers without losing prefix zeros Post 303001382 by Don Cragun on Wednesday 2nd of August 2017 03:49:22 PM
Old 08-02-2017
When you post questions like this in the future, please tell us what operating system and shell you're using!

If you're using ksh, the easy way to do it is:
Code:
LOGNUM=0000095
OLDLOG=$(printf "%07d" $((LOGNUM - 1)))
echo $OLDLOG

If you're using bash, you could use:
Code:
LOGNUM=0000095
OLDLOG=$(printf "%07d" $(echo "$LOGNUM - 1" | bc))
echo $OLDLOG

You can't use arithmetic expansions for this with bash because bash treats all numbers with a leading 0 as octal (not decimal) values.

If you're using a pure Bourne shell, you could use:
Code:
LOGNUM=0000095
OLDLOG=`echo "$LOGNUM - 1" | bc`
OLDLOG=`printf "%07d" $OLDLOG`
echo $OLDLOG

One of the above is likely to work with any shell that is based on Bourne shell syntax. I make no claims about how to do this with a shell based on csh syntax.
This User Gave Thanks to Don Cragun For This Post:
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LEARN ABOUT DEBIAN

tpm_takeownership

tpm_takeownership(8)					      System Manager's Manual					      tpm_takeownership(8)

							TPM Management - tpm_takeownership

NAME

       tpm_takeownership - setup an owner on the TPM

SYNOPSIS

       tpm_takeownership [OPTION]

DESCRIPTION

       tpm_takeownership setup an owner on the system's TPM (via the TPM_TakeOwnership API).  This operation requires the TPM to be enabled and
       can be restricted by tpm_setownable.  The command will prompt for owner and SRK passwords and confirmations of these if executed without
       either of the -well-known options, otherwise, a secret of all zeros is set for the requested password.  After the second confirmation, be
       patient as the command may take awhile.

       -h, --help
	      Display command usage info.

       -v, --version
	      Display command version info.

       -l, --log [none|error|info|debug]
	      Set logging level.

       -u, --unicode
	      Use TSS UNICODE encoding for passwords to comply with applications using TSS popup boxes

       -y, --owner-well-known
	      Set a secret of all zeros (20 bytes of zeros) as the owner's secret.

       -z, --srk-well-known
	      Set a secret of all zeros (20 bytes of zeros) as the SRK secret.

SEE ALSO

       tpm_version(1), tpm_setownable(8), tpm_setenable(8), tcsd(8)

REPORTING BUGS

       Report bugs to <trousers-users@lists.sourceforge.net>

TPM Management							    2005-05-06						      tpm_takeownership(8)
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