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Top Forums Shell Programming and Scripting Needed help in understanding these procedures? Post 302199321 by wrapster on Monday 26th of May 2008 11:31:30 AM
Old 05-26-2008
Needed help in understanding these procedures?

Hi all,
i needed some help in understanding a few procedures and how exactly is the sequence?
Code:
FINISHED="Done"

COLUMNS=$( stty -a | head -n 2 | cut -d " " -f2 |cut -d " " -f4 )
COLS=$((${COLUMNS} -${#FINISHED} - 5))


RET_ARR="\010"

KILLLINE=${RET_ARR}${RET_ARR}
for i in $(seq 1 $COLS)
do
    KILLLINE=${KILLLINE}${RET_ARR}
done


echo -n "0"
multiecho $(($COLS-4)) " "
echo '100%' ;


echo -n "|"
multiecho $COLS " "
echo -n "|"

PERCENTAGE=$(($COLS * $DESTFILESIZE / $SOURCEFILESIZE ))
       echo -e -n $KILLLINE"|"
    multiecho $PERCENTAGE "="

The destfile and the source file contain the size of respective ones..
I have not included them....
just pasted which part ive not understood
 

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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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