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41
votes
3answers
6k views

What exactly is POSIX?

I see POSIX mentioned often and everywhere, and I had assumed it to be the baseline UNIX standard.. until I noticed the following excerpt on a Wikipedia page: The Open Group The Open Group is ...
49
votes
6answers
1k views

Resources for portable shell programming

What resources exist for portable shell programming? The ultimate answer is to test on all targeted platforms, but that's rarely practical. The POSIX / Single UNIX specification is a start, but it ...
9
votes
1answer
520 views

What is the best way to detect (from a script) whether software is installed?

I've been frustrated before with differences in output from the which command across different platforms (Linux vs. Solaris vx. OS X), with different shells possibly playing into the matter as well. ...
12
votes
1answer
1k views

Why isn't GNU/Linux SUS v3+ compliant?

I am looking for specific details as to why isn't GNU/Linux currently SUS(Single UNIX Specification) v3 or even better SUS v4 compliant? What application apis and user utilities does it miss or ...
13
votes
1answer
1k views

What protocol/standard is used by terminals?

I was wondering how the "GUI" of a command line application is communicated over a network. Most of the time, it's quite simple (plain text / input) but sometimes it's more complex (aptitude). Is it ...
11
votes
2answers
3k views

Differences between sed on Mac OSX and other “standard” sed?

I am having some issues in using an answer provided on this site for this question about a sed command to replace a blank line with two other lines of content, and it was brought up if the sed command ...
2
votes
1answer
136 views

Where can I find the Official File Hierarchy Standard for UNIX? [duplicate]

Possible Duplicate: Resources to learn linux architecture in detail? I migrated to UNIX (Linux, Ubuntu) and I'm trying to understand the organisation of files and directories. I stumbled ...
6
votes
1answer
239 views

Is there a standard way to have a program start when a user logs in on Linux?

Is there a standard way to make a program start when a user logs in? On Ubuntu, for example, you can place a .desktop file in ~/.config/autostart and the application will launch on startup. Does ...
5
votes
4answers
204 views

is the behaviour of .* to include . and .. defined in LSB or POSIX or some other specification?

as title: is the behaviour of .* to include . and .. defined in LSB or POSIX or some other specification?