09-24-2003
I have never heard of behavior like that. What version of unix are you using?
I would try exactly what you did from the command line in a script. I assume that you are using ksh as your login shell. Since the cat command is detecting the problem, go with that. A well written command will return an exit code. See if your cat does. From the command line:
cat goodfile >/dev/null 2>&1
echo $?
cat badfile > /dev/null 2>&1
echo $?
Are the exit codes different?
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LEARN ABOUT SUSE
recordio
recordio(1) General Commands Manual recordio(1)
NAME
recordio - record the input and output of a program
SYNTAX
recordio program [ arg ... ]
DESCRIPTION
recordio runs program with the given arguments. It prints lines to stderr showing the input and output of program.
At the beginning of each line on stderr, recordio inserts the program process ID, along with < for input or > for output. At the end of
each line it inserts a space, a plus sign, or [EOF]; a space indicates that there was a newline in the input or output, and [EOF] indicates
the end of input or output.
recordio prints every packet of input and output immediately. It does not attempt to combine packets into coherent stderr lines. For
example,
recordio sh -c 'cat /dev/fd/8 2>&1' > /dev/null
could produce
5135 > cat: /dev/fd/8: Bad file descriptor
5135 > [EOF]
or
5135 > cat: +
5135 > /dev/fd/8+
5135 > : +
5135 > Bad file descriptor
5135 > [EOF]
recordio uses several lines for long packets to guarantee that each line is printed atomically to stderr.
recordio runs as a child of program. It exits when it sees the end of program's output.
SEE ALSO
tcpserver(1)
recordio(1)