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Full Discussion: Using shell commands in awk
Top Forums Shell Programming and Scripting Using shell commands in awk Post 302496473 by Ronnie717 on Monday 14th of February 2011 07:15:53 AM
Old 02-14-2011
Using shell commands in awk

Hi,

I've searched this site and the wider web and have not found anything (that I can understand..) that helps me.

I've used shell commands in awk fine in the past, the difference is that I want to pass the shell command a field variable within awk from the current input.

A simple example I'm struggling to get working is below:
Code:
echo rpm|awk '{"rpm -qc " $1 "|grep etc|getline configfile;print configfile}'

The error I get is:
awk: {"rpm -qc " $1 "|grep etc|getline configfile;print configfile}
awk:                ^ unterminated string
-bash: echo: write error: Broken pipe

I'm using this noddy example just so I can understand how it works before I look at using it properly.

Any guidance would be much appreciated.
 

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isympy(1)																 isympy(1)

NAME
isympy - interactive shell for SymPy SYNOPSIS
isympy [-c | --console] isympy [ {-h | --help} | {-v | --version} ] DESCRIPTION
isympy is a Python shell for SymPy. It is just a normal python shell (ipython shell if you have the ipython package installed) that exe- cutes the following commands so that you don't have to: >>> from __future__ import division >>> from sympy import * >>> x, y, z = symbols("xyz") >>> k, m, n = symbols("kmn", integer=True) So starting isympy is equivalent to starting python (or ipython) and executing the above commands by hand. It is intended for easy and quick experimentation with SymPy. For more complicated programs, it is recommended to write a script and import things explicitly (using the "from sympy import sin, log, Symbol, ..." idiom). OPTIONS
-c shell, --console=shell Use the specified shell (python or ipython) as console backend instead of the default one (ipython if present or python otherwise). Example: isympy -c python FILES
${HOME}/.sympy-history Saves the history of commands when using the python shell as backend. BUGS
The upstreams BTS can be found at <http://code.google.com/p/sympy/issues/list> Please report all bugs that you find in there, this will help improve the overall quality of SymPy. SEE ALSO
ipython(1), python(1) 2007-10-8 isympy(1)
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