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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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SHAR(1) 						    BSD General Commands Manual 						   SHAR(1)

NAME
shar -- create a shell archive of files SYNOPSIS
shar file ... DESCRIPTION
shar writes an sh(1) shell script to the standard output which will recreate the file hierarchy specified by the command line operands. Directories will be recreated and must be specified before the files they contain (the find(1) utility does this correctly). shar is normally used for distributing files by ftp(1) or mail(1). SEE ALSO
compress(1), mail(1), tar(1), uuencode(1) BUGS
shar makes no provisions for special types of files or files containing magic characters. EXAMPLES
To create a shell archive of the program ls(1) and mail it to Rick: cd ls shar `find . -print` | mail -s "ls source" rick To recreate the program directory: mkdir ls cd ls ... <delete header lines and examine mailed archive> ... sh archive HISTORY
The shar command appears in 4.4BSD. SECURITY CONSIDERATIONS
It is easy to insert trojan horses into shar files. It is strongly recommended that all shell archive files be examined before running them through sh(1). Archives produced using this implementation of shar may be easily examined with the command: egrep -v '^[X#]' shar.file 4.4BSD June 6, 1993 4.4BSD
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