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Full Discussion: What is #0 ?
Top Forums Shell Programming and Scripting What is #0 ? Post 302403130 by boy18nj on Thursday 11th of March 2010 01:55:42 PM
Old 03-11-2010
What is #0 ?

In this below function, I am trying to understand what is the purpose of
H1=${H1#0} ?
This is ksh. Any improvement to below function are also appreciated.

Code:
dateDiff(){
   echo enter first time stamp
   TIME1=`date +%H:%M:%S`
   echo enter second time stamp
   TIME2=23:59:59
   H1=`date +%H`
   echo "Hour="$H1
   M1=`date +%M`
   echo "Mintue="$M1
   S1=`date +%S`
   H2=23
   M2=59
   S2=59
   H1=${H1#0}
   M1=${M1#0}
   H2=${H2#0}
   M2=${M2#0}
   ((MAM1=H1+(M1/60)+(S1/3600)))
   ((MAM2=H2+(M2/60)+(S2/3600)))
   ((diff=MAM2-MAM1))
   echo diff = $diff
   return $diff
}

 
echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.11 3 Aug 1994 echo(1B)
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