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Full Discussion: pulling a column from a file in ksh
Top Forums Shell Programming and Scripting pulling a column from a file in ksh Post 33548 by Perderabo on Thursday 9th of January 2003 09:29:16 AM
Old 01-09-2003
This is not csh syntax, it is ksh syntax. Note that the title of this thread explicitly mentions ksh. In ksh, the $(command) is preferred, while the `command` syntax is currently supported for backward compatibility.

The advantage is nesting:
gcos=$(grep $(whoami) /etc/passwd | cut -d: -f5)
is easy to code and easy to read. Depending on the contents of the gcos field:
eval gcos=\`grep `whoami` /etc/passwd \| cut -d: -f5 \'
may or may not work.
 

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LEARN ABOUT SUNOS

whoami

whoami(1B)					     SunOS/BSD Compatibility Package Commands						whoami(1B)

NAME

       whoami - display the effective current username

SYNOPSIS

       /usr/ucb/whoami

DESCRIPTION

       whoami  displays  the  login  name  corresponding  to the current effective user ID. If you have used su to temporarily adopt another user,
       whoami will report the login name associated with that user ID. whoami gets its information from the geteuid and getpwuid library  routines
       (see getuid and getpwnam(3C), respectively).

FILES

       /etc/passwd	       username data base

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       su(1M), who(1), getuid(2), getpwnam(3C), attributes(5)

SunOS 5.10							    14 Sep 1992 							whoami(1B)
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