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Full Discussion: getting error with expr
Top Forums Shell Programming and Scripting getting error with expr Post 302146983 by drl on Friday 23rd of November 2007 07:43:21 AM
Old 11-23-2007
Hi.

I agree with Chella, it also worked for me, in that I did not get an expr error. I used the bash shell.

However, the sum was reported as zero. This is because a pipe-lined set of commands ( cat ... | while ... in your case) will be done in separate processes. This might be dependent on the shell; I have heard that the real Korn shell -- ksh -- does not exhibit this behavior. I tried it with pdksh and got a sum of zero. The variables in child processes are not available to the parent.

The usual solution to such a situation is to re-form the construction as:
Code:
while ...
do
... 
done < input_file

Best wishes ... cheers, drl
 

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LEARN ABOUT OPENSOLARIS

sum

sum(1)								   User Commands							    sum(1)

NAME

       sum - print checksum and block count for a file

SYNOPSIS

       sum [-r] [file]...

DESCRIPTION

       The   sum utility calculates and prints a 16-bit checksum for the named file and the number of 512-byte blocks in the file. It is typically
       used to look for bad spots, or to validate a file communicated over some transmission line.

OPTIONS

       The following options are supported:

       -r    Use an alternate (machine-dependent) algorithm in computing the checksum.

OPERANDS

       The following operands are supported:

       file    A path name of a file.  If no files are named, the standard input is used.

USAGE

       See largefile(5) for the description of the behavior of sum when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect  the	execution  of	sum:  LC_CTYPE,  LC_MESSAGES,  and
       NLSPATH.

EXIT STATUS

       The following exit values are returned.

       0     Successful completion.

       >0    An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------------------------------------+
       |      ATTRIBUTE TYPE		    ATTRIBUTE VALUE	   |
       |Availability		      SUNWesu			   |
       |CSI			      Enabled			   |
       +-----------------------------------------------------------+

SEE ALSO

       cksum(1), sum(1B), wc(1), attributes(5), environ(5), largefile(5)

DIAGNOSTICS

       Read error is indistinguishable from end of file on most devices. Check the block count.

NOTES

       Portable applications should use cksum(1).

       sum and usr/ucb/sum (see sum(1B)) return different checksums.

SunOS 5.11							    7 Nov 1995								    sum(1)
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