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Full Discussion: Confused over results using "tee" in piped command
Top Forums UNIX for Dummies Questions & Answers Confused over results using "tee" in piped command Post 302596896 by Corona688 on Wednesday 8th of February 2012 02:12:40 PM
Old 02-08-2012
You've used 'tee' without giving it any filenames, which is effectively the same as 'cat'. The one file it writes by default, stdout, you've redirected to a file, leaving nothing left for cut to get.

If you want tee to actually put the output into several files, don't redirect it, just tell which file you want

Code:
... | tee -a filename | ...

The -a is for append.

---------- Post updated at 01:12 PM ---------- Previous update was at 01:10 PM ----------

What I'd actually do, though?

Code:
wc -l < input > output
read NUMBER <output

Much more efficient, using nearly pure builtins except wc.
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LEARN ABOUT DEBIAN

tee

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

       --help display this help and exit

       --version
	      output version information and exit

       If a FILE is -, copy again to standard output.

AUTHOR

       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

REPORTING BUGS

       Report tee bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report tee translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 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

       The  full  documentation  for tee is maintained as a Texinfo manual.  If the info and tee programs are properly installed at your site, the
       command

	      info coreutils 'tee invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011							    TEE(1)
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