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Full Discussion: Providing variable contents to awk
Top Forums Shell Programming and Scripting Providing variable contents to awk Post 302605019 by Corona688 on Tuesday 6th of March 2012 12:49:32 PM
Old 03-06-2012
That is a useless use of cat, to avoid unwanted side-effects and splitting for things in backticks you would generally do

Code:
while read LINE
do
        echo "Read $LINE"
done < inputfile

...but in this case I'm not sure why you're using a while loop at all. awk is quite capable of reading more than one line by itself.

Anyway.

When you do "$g" by itself, it assumes that's a command. For instance:

Code:
$ G="cat"
$G file

file contents.
...
...

$

So you're not actually printing the line into awk here -- you're running it as a command, and piping its output into awk.

What you're trying to do is more like echo $G | awk ...

...but I think your program would be best rewritten as:

Code:
awk -F, '{ print $2 }' filename

This User Gave Thanks to Corona688 For This Post:
compguy74
 

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sh

sh(1)							      General Commands Manual							     sh(1)

NAME

       sh - overview of various system shells

SYNOPSIS

   POSIX Shell
       option] ...  string] [arg ...]

       option] ...  string] [arg ...]

   Korn Shell
       option] ...  string] [arg ...]

       option] ...  string] [arg ...]

   C Shell
       [command_file] [argument_list ...]

   Key Shell
DESCRIPTION

   Remarks
       The POSIX .2 standard requires that, on a POSIX-compliant system, executing the command activates the POSIX shell (located in file on HP-UX
       systems), and executing the command produces an on-line manual entry that displays the syntax of the POSIX shell command-line.

       However, the command has historically been associated with the conventional Bourne shell, which could confuse some users.   To  meet  stan-
       dards  requirements  and also clarify the relationships of the various shells and where they reside on the system, this entry provides com-
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       The Bourne shell is removed from the system starting with HP-UX 11i Version 1.5.  Please use the POSIX shell as an alternative.

   Shell Descriptions
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	      POSIX-conforming command programming language and command interpreter
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			effect at the time the HP-UX system release was introduced, and is similar to the Korn shell in many respects.	Similar in
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	      Korn-shell command programming language and commands interpreter
			residing in file Can execute commands read from a terminal or a file.  This shell, like the POSIX shell, contains  a  his-
			tory mechanism, supports job control, and provides various other useful features.

	      A command language interpreter
			that incorporates a command history buffer, C-language-like syntax, and job control facilities.

	      Restricted version of the POSIX shell command interpreter.
			Sets  up  a  login  name  and  execution  environment whose capabilities are more controlled (restricted) than normal user
			shells.

	      restricted version of the Korn-shell command interpreter
			Sets up a login name and execution environment whose capabilities  are	more  controlled  (restricted)	than  normal  user
			shells.

	      An extension of the standard Korn Shell
			that uses hierarchical softkey menus and context-sensitive help.

							  +--------------+--------------------+
							  | To obtain:	 |  Use the command:  |
							  +--------------+--------------------+
							  | POSIX Shell  |  /usr/bin/sh ...   |
							  | Korn Shell	 |  /usr/bin/ksh ...  |
							  | C Shell	 |  /usr/bin/csh ...  |
							  | Key Shell	 |  /usr/bin/keysh    |
							  +--------------+--------------------+
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SEE ALSO

       For more information on the various individual shells, see:

       keysh(1)       Key Shell description.

       ksh(1)	      Korn Shell description.

       sh-posix(1)    POSIX Shell description.

       csh(1)	      C Shell description.

																	     sh(1)
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