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Full Discussion: Format of 'select' generated menu
Top Forums Shell Programming and Scripting Format of 'select' generated menu Post 302898292 by edstevens on Monday 21st of April 2014 08:09:39 AM
Old 04-21-2014
Quote:
Originally Posted by sea
You mix up the defintion of columns.
While $COLUMNS represents the value of characters possible to be presented on one line,
So if it set COLUMNS=20 it shouldn't present a menu in multiple columns if such presentation would require more than 20 characters (including spacing) per line? Again, that makes sense in explanation, but not in observation. With the default value of 80 (or is it null? see comment on that, regarding environment inheritance, below), and all of my menu items of short (< 8 chars each) it presented in a single column. But by the above understanding it should have presented multiple columns. Only when one of the menu items was a longer value did the presentation go to multiple values.

Quote:
the columns of 'select' contain more than 1 char per line.
I'm afraid the meaning of that is escaping me.

Quote:
While its true that a script inherits the values of variables from the caller-environmnet (eg: terminal),
you can set it to something diffrent and change it back after its use.
Example (in the script):
Code:
OLD_COL=$COLUMNS
COLUMNS=20
select CHOICE in A B C D E F G;do echo $CHOICE;break;done
COLUMNS=$OLD_COL

So you dont mix up the output that follows your 'select' call.

hth
Yes, I know I can save and reset it. But my point was that I was not observing the script to actually inherit from the caller.

Code:
oracle:11g$ cat doit2
#!/bin/sh
echo COLUMNS = $COLUMNS
exit

oracle:11g$ echo $COLUMNS
80

oracle:11g$ ./doit2
COLUMNS =

oracle:11g$ echo $COLUMNS
80

oracle:11g$

 

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qrencode

QRENCODE(1)						      General Commands Manual						       QRENCODE(1)

NAME

       qrencode - Encode input data in a QR Code and save as a PNG or EPS image.

SYNOPSIS

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DESCRIPTION

       Libqrencode  is	a  library  for encoding data in a QR Code symbol, a kind of 2D symbology that can be scanned by handy terminals such as a
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	      display the version number and copyrights of the qrencode.

       [STRING]
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EXAMPLES

       qrencode -l L -v 1 -o output.png 'Hello, world!'
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AUTHOR

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RESOURCES

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COPYRIGHT

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qrencode 3.3.0							   Feb. 29, 2012						       QRENCODE(1)
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