Duplicate output without tee

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tee

tee(1)							      General Commands Manual							    tee(1)

NAME

       tee - Displays the output of a program and copies it into a file

SYNOPSIS

       tee [-ai] file...

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       tee:  XCU5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

OPTIONS

       Adds the output to the end of file instead of writing over it.  Ignores the SIGINT signal.

OPERANDS

       Standard input is stored into, or appended to, the file specified.

	      [Tru64 UNIX]  The tee command can accept up to 20 file arguments.

DESCRIPTION

       The tee command reads standard input and writes to both standard output, and each specified file.

       The tee command is useful when you wish to view program output as it is displayed, and also want to save it in a file. The tee command does
       not buffer output, so you may wish to pipe the output of tee to more if more than one full screen of data is anticipated.

NOTES

       If a write to any file fails, the exit status of tee will be non-zero.  Writes to all other specified files may be successful,  and  opera-
       tion will continue until standard input is exhausted.

EXIT STATUS

       The following exit values are returned: Successful completion.  An error occurred.

EXAMPLES

       To view and save the output from a command at the same time, enter: lint program.c | tee program.lint

	      This displays the standard output of the command lint program.c at the terminal, and at the same time saves a copy of it in the file
	      program.lint. If program.lint already exists, it is deleted and replaced.  To display and append to a file, enter: lint program.c  |
	      tee -a program.lint

	      This  displays  the  standard  output of lint program.c at the terminal and at the same time appends a copy of it to the end of pro-
	      gram.lint.  If the file program.lint does not exist, it is created.

ENVIRONMENT VARIABLES

       The following environment variables affect the execution of tee: Provides a default value for the internationalization variables  that  are
       unset or null. If LANG is unset or null, the corresponding value from the default locale is used.  If any of the internationalization vari-
       ables contain an invalid setting, the utility behaves as if none of the variables had been defined.  If set to a  non-empty  string  value,
       overrides  the  values of all the other internationalization variables.	Determines the locale for the interpretation of sequences of bytes
       of text data as characters (for example, single-byte as opposed to multibyte characters in arguments).  Determines the locale for the  for-
       mat  and  contents  of  diagnostic messages written to standard error.  Determines the location of message catalogues for the processing of
       LC_MESSAGES.

SEE ALSO

       Commands:  cat(1), echo(1), script(1)

       Standards:  standards(5)

																	    tee(1)

Shell Programming and Scripting