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Full Discussion: expr not working
Top Forums Shell Programming and Scripting expr not working Post 302482561 by mady135 on Wednesday 22nd of December 2010 01:20:36 AM
Old 12-22-2010
Question expr not working

I am trying to get some coubt through the following code.
Code:
tot_ln_cnt=`wc -l ${OUTPUT_FILE_NAME}`
echo "tot_ln_cnt : "$tot_ln_cnt
fl_cnt=`ls -lrt *edi | wc -l`
echo "fl_cnt : "$fl_cnt
exclude_cnt=`expr $fl_cnt \* 2`
echo "exclude_cnt : "$exclude_cnt
ln_cnt=`expr $tot_ln_cnt - $exclude_cnt`
echo "ln_cnt : "$ln_cnt
if [ "${ln_cnt}" -gt 0 ]
then
echo "Total "${ln_cnt}" records written to the file "${OUTPUT_FILE_NAME} >>  ${LOG_FILE_NAME} 2>&1
else
echo "No records written to the file "${OUTPUT_FILE_NAME} >>  ${LOG_FILE_NAME} 2>&1
fi

but each time, I am getting a expr: Syntax error, while running this . along with that the value ln_cnt is not geting generated.
Also, the ln_cnt value might come as negative, if no records written...is the above code enough to get it done?
 

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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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