I'm a programmer of too many years to mention, but I'm only just starting my journey into unix based systems. I'm staring out with the Raspberry pi as they're inexpensive and have the built in GPIO which is always good fun. It's running the default Raspbian system.
Unix scripting is completely new to me, while I'm geo'll run atting used to it slowly I'm struggling with one problem, I'm not even sure if it's the right thing to do.
I want to change settings in a conf file. Example:
Code:
A Setting=5
Another Setting=15
The Last Setting=42
I'll run a sh to change Another Setting to 27.
Now, I can achieve this in two ways, I can have a bunch of files with different settings and rename/copy the one I want at the time. Or I can search the file and change the setting. The second is the preferred method as it's much more flexible.
How practical is it to write script that will search a file for settings and change them? Is parsing files something that's often done with scripts, if so, what commands do I need to get acquainted with? Or do people jump to python or other methods for such things?
All input welcome.
Thanks.
Moderator's Comments:
Please use CODE tags as required by forum rules!
Last edited by RudiC; 11-27-2017 at 11:06 AM..
Reason: Added CODE tags.
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LEARN ABOUT ULTRIX
doconfig
doconfig(8) System Manager's Manual doconfig(8)Name
doconfig - a program to aid system configuration
Syntax
/etc/doconfig [-c config_file] [-e ed_script]
Description
The shell script modifies a copy of the GENERIC configuration file for a new ULTRIX system kernel. The script prompts you for the system
name. If the system name does not currently exist, a system configuration file with that system name is built.
Whether the configuration file is built or not, the script then allows you to edit, configure, and build until both the configuration and
the kernel build run without errors. Additional runs of can be made to tune the configuration further.
When new hardware is added to a system, the configuration file should be updated to reflect the new system configuration. When updating an
existing configuration file or creating a new configuration file with the system must be operating the generic kernel or new hardware may
not be found. To successfully complete the process, follow these steps:
1. Save the running as
2. Move to
3. Reboot the system to single user mode.
4. Check file systems.
5. Mount the file system.
6. Run the program. (When execution is complete, make a note of the message prints showing the path and location of the new
7. Move to
8. Copy the new (from the message noted above) to
9. Reboot the system.
Options-c The name of the existing configuration file should be supplied without specifying the pathname. This file should exist in the
directory. A new kernel is built using the specified configuration file.
-e When specified, the configuration file is edited by the ed script before building the new kernel.
FilesSee Alsoed(1), config(8)
Basic Installation Guide
Guide to System Configuration File Maintenance
RISC doconfig(8)
11-27-2017
Replacing settings in config files.
