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Top Forums Shell Programming and Scripting Read command restarts at beginning of file Post 302990316 by Don Cragun on Tuesday 24th of January 2017 02:02:07 PM
Old 01-24-2017
Since there is only one input file and one output file in your original code:
Code:
read header < $infile 
    lineout=...$header...
echo $lineout >> $outfile
 
while read dataline
do
   lineout=....$dataline.....
   echo $lineout >> $outfile
done < $infile

you could put all of your script in a group and redirect the input and output of the group instead of redirecting each command in the group:
Code:
{   read header
    lineout=...$header...
    echo "$lineout"

    while read dataline
    do
        lineout=....$dataline.....
        echo $lineout
    done
} < "$infile" >> "$outfile"

This User Gave Thanks to Don Cragun For This Post:
 

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shcomp(1)							   User Commands							 shcomp(1)

NAME
shcomp - compile a ksh93 shell script SYNOPSIS
shcomp [-nv] [infile [outfile]] shcomp -D [infile [outfile]] DESCRIPTION
If the -D option is not specified, shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh93 reads and executes with the same effect as the original script. Aliases are processed as the script is read. Alias definitions whose value requires variable expansion will not work correctly. OPTIONS
The following options are supported: -D Generate a list of strings that need to be placed in a message catalog for internationalization. --dictionary With this option, all double quoted strings that are preceded by $ are printed, one literal per line. A literal $"foo" prints "foo" in the output. These are the messages that need to be translated to locale specific versions for internation- alization. -n Display warning messages for obsolete or non-conforming constructs. --noexec -v Display input from infile onto standard error as it reads it. --verbose OPERANDS
The following operands are supported: infile Specifies the name of the file that contains the shell script to be used as input. If infile is omitted, the shell script is read from standard input. outfile Specifies the name of the output file. If outfile is omitted, both modes write their results to standard output. 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 |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |See below. | +-----------------------------+-----------------------------+ The command-line interface and the system variables are Committed. The compiled shell code format is Private. The output of the -D option is Volatile. SEE ALSO
ksh93(1), attributes(5) SunOS 5.11 27 Jan 2009 shcomp(1)
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