What's going on in my scripts? Post: 302188341

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Top Forums Shell Programming and Scripting What's going on in my scripts? Post 302188341 by era on Wednesday 23rd of April 2008 07:52:21 AM

04-23-2008

Registered User

Does dbFindChannel eat your standard input so it's empty on the next iteration?

Try rearranging the file descriptors.

I'm taking the liberty to fix some fluff while editing this ...

Code:

#!/bin/ksh
#To retrieve the ID for lots of the channels
#The id is the _NEWESTEID
#Usage: RetrieveID.ksh <filein> <fileout>
set -x

tmpfile="/tmp/tmpfile"
tmpfile2="/tmp/tmpfile2"

if [ $# -ne 2 ]; then
    echo "Usage:"
    echo "$0  <filein> <fileout> "
    exit 1
fi

exec 3<"$1"
while read line <&3
do
    CHANNELNAME=`echo $line | awk -F: '{print $3}' `

    if dbFindChannel -n ${CHANNELNAME} >${tmpfile2}
    then
        NewID=`awk '/DBUS_CHANNEL_NEWESTEID/ {print $2}' ${tmpfile2}`
    else
        NewID="Failed"        #If dbFindChannel failed
    fi

    echo "$line" "\t" "$NewID" >>${tmpfile}
done  # no <$1
exec 3<&-

mv ${tmpfile} "$2"
rm -f ${tmpfile2}

exit 0

Note the addition of double quotes around variables, the "if" flow, and the lack of Useless Use of More (sic)

Last edited by era; 04-23-2008 at 08:53 AM.. Reason: Note minor changes

era

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LEARN ABOUT REDHAT

tmpfile

TMPFILE(3)						     Linux Programmer's Manual							TMPFILE(3)

NAME

       tmpfile - create a temporary file

SYNOPSIS

       #include <stdio.h>

       FILE *tmpfile (void);

DESCRIPTION

       The tmpfile() function generates a unique temporary filename.  The temporary file is then opened in binary read/write (w+b) mode.  The file
       will be automatically deleted when it is closed or the program terminates normally.

RETURN VALUE

       The tmpfile() function returns a stream descriptor, or NULL if a unique filename cannot be generated or the unique file cannot  be  opened.
       In the latter case, errno is set to indicate the error.

ERRORS

       EACCES Search permission denied for directory in file's path prefix.

       EEXIST Unable to generate a unique filename.

       EMFILE Too many file descriptors in use by the process.

       ENFILE Too many files open in the system.

       ENOSPC There was no room in the directory to add the new filename.

       EROFS  Read-only filesystem.

       EINTR  The call was interrupted by a signal.

       CONFORMING TO
	      SVID 3, POSIX, BSD 4.3, ISO 9899, SUSv2

NOTES

       An error message may be written to stdout if the stream cannot be opened.

       The  standard  does not specify the directory that tmpfile() will use. Glibc will try the path prefix P_tmpdir defined in <stdio.h>, and if
       that fails the directory /tmp.

SEE ALSO

       exit(3), mktemp(3), mkstemp(3), tmpnam(3), tempnam(3)

								    2001-11-17								TMPFILE(3)