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Full Discussion: Error Trapping
Top Forums Shell Programming and Scripting Error Trapping Post 302576573 by m.d.ludwig on Friday 25th of November 2011 09:01:27 AM
Old 11-25-2011
If ls "fails" -- which I believe to mean it does not match the "${SegList}.DAT.${Datelist}.GZ" pattern -- there is no output, the file is empty.

I am trying to figure out what you are trying to do. First off, I indented your code (which makes it much easier to read):
Code:
while read SegList; do
    if test -s ${SourceFile_Path}/${Segment_List_Temp}; then
        ls -r -1 ${FTP_Path}/${SegList}.DAT.${Datelist}.GZ | cut -d '.' -f2 >> ${SourceFile_Path}/${List_Temp}
    else
        ls -r -1 ${FTP_Path}/${SegList}.DAT.${Datelist}.GZ | cut -d '.' -f2 > ${SourceFile_Path}/${List_Temp}
     fi
done < ${Segmentlist_Path}/${Segment_List}

Inside the loop, the only difference I see is that ${List_Temp} is appended to if ${Segment_List_Temp} exists and has data, otherwise ${List_Temp} is overwritten. This can be simplified by removing ${List_Temp} when ${Segment_List_Temp} does not exist or has no data, and then append to ${List_Temp}, as follows:
Code:
while read SegList; do
    if ! test -s ${SourceFile_Path}/${Segment_List_Temp}; then
        rm -f ${SourceFile_Path}/${List_Temp}
    fi

    ls -r -1 ${FTP_Path}/${SegList}.DAT.${Datelist}.GZ | cut -d '.' -f2 >> ${SourceFile_Path}/${List_Temp}
done < ${Segmentlist_Path}/${Segment_List}

${Segment_List_Temp} is not otherwise modified by the script, so it can be pulled out of the loop, as can the cut:
Code:
if ! test -s ${SourceFile_Path}/${Segment_List_Temp}; then
    rm -f ${SourceFile_Path}/${List_Temp}
fi

while read SegList; do
    ls -r -1 ${FTP_Path}/${SegList}.DAT.${Datelist}.GZ
done < ${Segmentlist_Path}/${Segment_List} \
| cut -d '.' -f2 >> ${SourceFile_Path}/${List_Temp}

BTW, what is the value of ${Datelist}? Is it a pattern? Also, does either ${FTP_Path} or ${SeqList} contain "."? If not, then the output file will contain nothing but lines of "DAT".

I do have to ask -- what is the intention of this script?
 

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LEARN ABOUT DEBIAN

seqdiag

SEQDIAG(1)						      General Commands Manual							SEQDIAG(1)

NAME

       seqdiag - generate sequence-diagram image file from spec-text file.

SYNOPSIS

       seqdiag [options] file

DESCRIPTION

       This manual page documents briefly the seqdiag commands.

       seqdiag is generate sequence-diagram image file from spec-text file.

OPTIONS

       These  programs	follow	the  usual  GNU  command  line	syntax, with long options starting with two dashes (`-').  A summary of options is
       included below.	For a complete description, see the Info files.

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -a, --antialias
	      Pass diagram image to anti-alias filter

       -c FILE, --config=FILE
	      read configurations from FILE

       -o FILE
	      write diagram to FILE

       -f FONT, --font=FONT
	      use FONT to draw diagram

       -T TYPE
	      Output diagram as TYPE format

SEE ALSO


       The programs are documented fully by
       http://tk0miya.bitbucket.org/seqdiag/build/html/index.html

AUTHOR

       seqdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>

       This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).

								   May 21, 2011 							SEQDIAG(1)
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