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Shell Programming and Scripting
Conversion of Perl Script to Shell Script..
Post 302929363 by ongoto on Friday 19th of December 2014 07:24:27 PM
12-19-2014
Good. We all agree. 
The shell is the coders swiss army knife. But to use it exclusively out of prejudice is cheating yourself. OO languages do have a lot to offer if you need to pass around groups of data all in one go and that sort of thing. The shell now has associative arrays, but they don't stay ordered. Try looping through them. Try passing an array to a function. There goes your indexes. But that doesn't make the shell bad. You're gonna hit a wall in the others too.
In Perl you always end up making calls to the shell because it saves work. Why write a block of Perl code to do 'uname -r'? On the other hand, Perl lets you do things like "do something unless condition", or "if condition, etc" all in one statement. If Perl can save you some work, then why not use it.? Same with Python and the others mentioned. What would we shell coders do without Awk and Sed and Grep?
Ya got tools that are metric, some are std SAE, and then there are the 'star' bits and the universal sockets. But you can't cut down a tree with a phillips!
Cheers mates
Awesome.
AE6UB said that.
The shell is the coders swiss army knife. But to use it exclusively out of prejudice is cheating yourself. OO languages do have a lot to offer if you need to pass around groups of data all in one go and that sort of thing. The shell now has associative arrays, but they don't stay ordered. Try looping through them. Try passing an array to a function. There goes your indexes. But that doesn't make the shell bad. You're gonna hit a wall in the others too.
In Perl you always end up making calls to the shell because it saves work. Why write a block of Perl code to do 'uname -r'? On the other hand, Perl lets you do things like "do something unless condition", or "if condition, etc" all in one statement. If Perl can save you some work, then why not use it.? Same with Python and the others mentioned. What would we shell coders do without Awk and Sed and Grep?
Ya got tools that are metric, some are std SAE, and then there are the 'star' bits and the universal sockets. But you can't cut down a tree with a phillips!
Cheers mates
Quote:
Hi ongoto...
Let me know when PERL, Python or nearly any other language for that matter, can do this:-
Is there anything the shell can't do?
...
Let me know when PERL, Python or nearly any other language for that matter, can do this:-
Is there anything the shell can't do?
...
AE6UB said that.
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LEARN ABOUT DEBIAN
isympy
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)