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Full Discussion: Help with tee command
Top Forums Shell Programming and Scripting Help with tee command Post 302778713 by kumarjt on Monday 11th of March 2013 11:50:48 AM
Old 03-11-2013
Help with tee command

In the current directory , I have seven files .
But when I use the following command , it lists eight files ( 7 files + file_list.xtx)
Code:
 
ls -1 | tee file_list.xtx | while read line; do echo $line  ; done

Does the tee command create the file_list.xtx file first and then executes the ls -1 command ?
My understanding was:
1. First the ls -1 command will get executed listing the 7 files
2. Entries of all th seven files will be written in a new file created by the tee command (file_list.xtx)
3. The output of ls -1 command ( entries of 7 files only ) will ve passed to the while loop for further processing


Is my concept wrong ?

Thanks
Kumarjit.
 

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tee(1)								   User Commands							    tee(1)

NAME
tee - replicate the standard output SYNOPSIS
tee [-ai] [file...] DESCRIPTION
The tee utility will copy standard input to standard output, making a copy in zero or more files. tee will not buffer its output. The options determine if the specified files are overwritten or appended to. OPTIONS
The following options are supported. -a Appends the output to the files rather than overwriting them. -i Ignores interrupts. OPERANDS
The following operands are supported: file A path name of an output file. Processing of at least 13 file operands will be 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
The following exit values are returned: 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. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ SEE ALSO
cat(1), attributes(5), environ(5), largefile(5), standards(5) SunOS 5.10 20 Dec 1996 tee(1)
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