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Top Forums Shell Programming and Scripting What's the best way to read config files? Post 302558453 by ninjaaron on Friday 23rd of September 2011 03:06:34 PM
Old 09-23-2011
Quote:
Originally Posted by maverick72
You don't need to use cat ... read useless use of cat (dont worry everyone has been there)
Interesting

So what do I use instead of cat for a line like this?

Code:
foo=`cat config_file|grep var_name|cut -d'=' -f2`

As to the question posting my config file, I don't have a specific one in mind. Something in another thread brought it to mind, and it's something I've been thinking about for a while.
------------------------------------------
As to the other comments:

Ok, I'll try doing it with scripts instead. The main config file I'm thinking provides variables for 17 different scripts (many of which both a) require the same variables and b) call eachother), so I'm not sure if it makes sense to have each of them loading all of the variables.,, I guess I could have any parent scripts load the proper variables into the sub-scripts... but some of them are called both independently and as a part of other operations. It's sort of complicated. since it's basically designed to shift my netbook between keyboard and tablet mode, and it manages all the settings for each mode, as well as things like rotating the screen and syncing the virtual keyboard with the screen orientation.

So far, I've just been "cat"ing all the required variables into each script as they are needed. I have no idea if this is the right way to do it. It's just what occured to me to do. That's sort of how all my scripting is. I just use the few commands I know to get the result I want. It usually works, but I'm sure there is all kinds of stupidity happening in the process(es?).
 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat, read, nobs - catenate files SYNOPSIS
cat [ file ... ] read [ -m ] [ -n nline ] [ file ... ] nobs [ file ... ] DESCRIPTION
Cat reads each file in sequence and writes it on the standard output. Thus cat file prints a file and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no file is given, cat reads from the standard input. Output is buffered in blocks matching the input. Read copies to standard output exactly one line from the named file, default standard input. It is useful in interactive rc(1) scripts. The -m flag causes it to continue reading and writing multiple lines until end of file; -n causes it to read no more than nline lines. Read always executes a single write for each line of input, which can be helpful when preparing input to programs that expect line-at-a- time data. It never reads any more data from the input than it prints to the output. Nobs copies the named files to standard output except that it removes all backspace characters and the characters that precede them. It is useful to use as $PAGER with the Unix version of man(1) when run inside a win (see acme(1)) window. SOURCE
/src/cmd/cat.c /src/cmd/read.c /bin/nobs SEE ALSO
cp(1) DIAGNOSTICS
Read exits with status eof on end of file or, in the -n case, if it doesn't read nlines lines. BUGS
Beware of and which destroy input files before reading them. CAT(1)
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