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Top Forums UNIX for Dummies Questions & Answers Single UNIX command to display users and to count them Post 302739429 by sreyan32 on Tuesday 4th of December 2012 07:40:57 AM
Old 12-04-2012
Question

Quote:
Originally Posted by Skrynesaver
Something like this might do it
Code:
  w | tail -$(( $(w| wc -l) - 2 ))  | tee >(cut -d\  -f1|uniq | wc -l >/dev/stderr )

Can you please break up this command and explain it to me. I am completely new to unix and don't understand it. But it has worked flawlessly.
 

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tee(1)							      General Commands Manual							    tee(1)

NAME
tee - pipe fitting to copy standard output to file SYNOPSIS
[file]... DESCRIPTION
The command transcribes the standard input to the standard output and makes copies in the files. Options This option ignores interrupts. This option appends the output to the files rather than overwriting the files. EXTERNAL INFLUENCES
Environment Variables determines the language in which messages are displayed. If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari- able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multibyte character code sets are supported. RETURN VALUE
The command returns zero upon successful completion, or nonzero if the command fails. EXAMPLES
Write a list of users to the screen and also append the list to the file STANDARDS CONFORMANCE
tee(1)
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