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Full Discussion: Problem with print command
Top Forums Shell Programming and Scripting Problem with print command Post 302074083 by Perderabo on Friday 19th of May 2006 02:05:33 PM
Old 05-19-2006
sed '1d' ${SQLLISTFILE} | tee ${SQLLISTFILE} > /dev/null 2>&1 --->This command executes fine.
Smilie Smilie Smilie
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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TEE(1)								   User Commands							    TEE(1)

NAME
tee - read from standard input and write to standard output and files SYNOPSIS
tee [OPTION]... [FILE]... DESCRIPTION
Copy standard input to each FILE, and also to standard output. -a, --append append to the given FILEs, do not overwrite -i, --ignore-interrupts ignore interrupt signals -p diagnose errors writing to non pipes --output-error[=MODE] set behavior on write error. See MODE below --help display this help and exit --version output version information and exit MODE determines behavior with write errors on the outputs: 'warn' diagnose errors writing to any output 'warn-nopipe' diagnose errors writing to any output not a pipe 'exit' exit on error writing to any output 'exit-nopipe' exit on error writing to any output not a pipe The default MODE for the -p option is 'warn-nopipe'. The default operation when --output-error is not specified, is to exit immediately on error writing to a pipe, and diagnose errors writing to non pipe outputs. AUTHOR
Written by Mike Parker, Richard M. Stallman, and David MacKenzie. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report tee translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/tee> or available locally via: info '(coreutils) tee invocation' GNU coreutils 8.28 January 2018 TEE(1)
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