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Shell Programming and Scripting
Problem with print command
Post 302074083 by Perderabo on Friday 19th of May 2006 02:05:33 PM
05-19-2006
sed '1d' ${SQLLISTFILE} | tee ${SQLLISTFILE} > /dev/null 2>&1 --->This command executes fine.
Never write code soon after you look at one of M C Escher's drawings! You are reading from and writing to the same file from different sides of the same pipeline. OK, that almost makes sense... But the whole purpose of tee is to duplicate an I/O stream. You're keeping the duplicate and sending the original to /dev/null?! Umm...you wanted a fresh copy? Anyway you are going to get different results depending on a lot of factors. You need your sed process to completely read the file prior to the tee process opening the file. That might happen every now and then if the file is short enough.
Never write code soon after you look at one of M C Escher's drawings! You are reading from and writing to the same file from different sides of the same pipeline. OK, that almost makes sense... But the whole purpose of tee is to duplicate an I/O stream. You're keeping the duplicate and sending the original to /dev/null?! Umm...you wanted a fresh copy? Anyway you are going to get different results depending on a lot of factors. You need your sed process to completely read the file prior to the tee process opening the file. That might happen every now and then if the file is short enough.
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LEARN ABOUT OPENSOLARIS
tee
tee(1) User Commands tee(1) NAME
tee - replicate the standard output SYNOPSIS
/usr/bin/tee /usr/bin/tee [-ai] [file]... ksh93 tee [-ail] [file]... DESCRIPTION
/usr/bin/tee /usr/bin/tee copies standard input to standard output, making a copy in zero or more files. tee does not buffer its output. The options determine if the specified files are overwritten or appended to. ksh93 The tee built-in in ksh93 is associated with the /bin and /usr/bin paths. It is invoked when tee is executed without a pathname prefix and the pathname search finds a /bin/tee or /usr/bin/tee executable. tee copies standard input to standard output and to zero or more files. The options determine whether the specified files are overwritten or appended to. The tee utility does not buffer output. If a write to a file fails, tee continues to write to other files although it exits with a non-zero exit status. The number of file operands that can be specified is limited by the underlying operating system. OPTIONS
/usr/bin/tee The following options are supported by /usr/bin/tee: -a Appends the output to the files rather than overwriting them. -i Ignores interrupts. ksh93 The following options are supported by the tee built-in command in ksh93: -a Appends the output to the files rather than overwriting them. --append -i Ignores SIGINT signal. --ignore-interrupts -l Sets the standard output to be line buffered. --line-buffer OPERANDS
The following operands are supported: file A path name of an output file. Processing of at least 13 file operands are supported. USAGE
See largefile(5) for the description of the behavior of tee 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 tee: LANG, LC_ALL, LC_CTYPE, LC_MES- SAGES, and NLSPATH. EXIT STATUS
/usr/bin/tee The following exit values are returned by /usr/bin/tee: 0 The standard input was successfully copied to all output files. >0 The number of files that could not be opened or whose status could not be obtained. ksh93 The following exit values are returned by tee in ksh93: 0 Successful completion. >0 An error occurred. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: /usr/bin/tee +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ |Standard |See standards(5). | +-----------------------------+-----------------------------+ ksh93 +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |See below. | +-----------------------------+-----------------------------+ The ksh93 built-in binding to /bin and /usr/bin is Volatile. The built-in interfaces are Uncommitted. SEE ALSO
cat(1), ksh93(1), attributes(5), environ(5), largefile(5), standards(5) SunOS 5.11 20 Nov 2007 tee(1)