tee - Displays the output of a program and copies it into a file
tee [-ai] file...
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Refer to the standards(5) reference page for more information about indus-
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-a Adds the output to the end of file instead of writing over it.
-i Ignores the SIGINT signal.
Standard input is stored into, or appended to, the file specified.
[Tru64 UNIX] The tee command can accept up to 20 file arguments.
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.
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 operation will
continue until standard input is exhausted.
The following exit values are returned:
0 Successful completion.
>>0 An error occurred.
1. 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
2. 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 program.lint.
If the file program.lint does not exist, it is created.
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
variables 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 multi-
byte characters in arguments).
Determines the locale for the format and contents of diagnostic mes-
sages written to standard error.
Determines the location of message catalogues for the processing of
Commands: cat(1), echo(1), script(1)