Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Can I view Bash POSIX extensions?
Top Forums UNIX for Beginners Questions & Answers Can I view Bash POSIX extensions? Post 303011127 by jim mcnamara on Saturday 13th of January 2018 03:01:38 PM
Old 01-13-2018
Code:
#!/bin/bash --posix   # puts bash in POSIX mode

Note: bash in POSIX mode is not 100% POSIX guaranteed. It is really close.

The extensions are innate to bash. You do nothing special to make them switch on. You have to be aware of what ways turn them on, turn them off.

So you cannot view them. You may not know this, but you can add your own code and make it part of bash as well. This is not recommended because every upgrade/bugfix means you have to add your change back in.

Code:
#!/bin/bash

on the first line of the script invokes native bash. NOT POSIX.
Code:
#!/bin/sh

on the first line of the script invokes bash in POSIX mode. If /bin/sh is a symlink that points to bash

See: Difference between sh and bash * GitHub

Want to add bash extensions of your own? - examples:
http://cfajohnson.com/shell/date-fun...e-functions-sh
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

.gz extensions

What do I use to open a file with a .gz extension? I'm guessing I need some kind of "unzipping" tool. (1 Reply)
Discussion started by: flopper
1 Replies

2. BSD

Posix queues

Hi! Everybody%) I got a question like this: Does my FreeBSD5.1 support Posix queues. Thanks! (7 Replies)
Discussion started by: kamazi
7 Replies

3. UNIX for Dummies Questions & Answers

extensions

Hey! Do you guys know of a good site that can explain all the Unix commands... I have been using Unix för almost 6 months but still have probelms with things like -u -U -g -G -R -T bla bla bla bla thanks! Dave (3 Replies)
Discussion started by: inkastinka
3 Replies

4. UNIX for Dummies Questions & Answers

how to read POSIX?

how to read POSIX? poe six or not? (3 Replies)
Discussion started by: robin.zhu
3 Replies

5. Programming

Posix

HI, When i am configuring php in SUN Solaris. I am getting the below error. configure: error: Your system seems to lack POSIX threads. Do i need to install POSIX? If so can somebody let me know where can i download POSIX for Solaris 8? Thanks, (2 Replies)
Discussion started by: Krrishv
2 Replies

6. Programming

ResumeThread on POSIX

Hi all How i can create thread in SUSPENDED mode, and resume when i want. I have win code with CreateThread (parameter CREATE_SUSPEND), and Resume Thread, but on POSIX with pthread i cant do it. Please help me. Best regards // Kolesar (5 Replies)
Discussion started by: Kolesar
5 Replies

7. UNIX Desktop Questions & Answers

Appending file extensions to filenames in bash scripts

Hi Suppose I have a variable called filename and it it contains the name of a file. I then would like to append an extension to that filename. The filename currently has no extensions. How do I do this? Thanks (11 Replies)
Discussion started by: ladyAnne
11 Replies

8. Shell Programming and Scripting

Ls without extensions.

Hello everyone. :) I need to write a script and I'm newbie in it. Sorry for my English, I've been learning that amazing language for one year. Task: Write script called 'myls', "wrapper" program call ls in such a way that you could ask it the name of the file without extension, for example:... (1 Reply)
Discussion started by: Sweetheart
1 Replies

9. OS X (Apple)

POSIX compliance...

Thanks to all you guys about posix compliance I have learnt an enormous amount over the last few days. I have written a program that is an Egg Timer with simple animation. I now realise how sophisticated 'bash' is compared to full posix compliance. The code below has passed all of the tests from... (11 Replies)
Discussion started by: wisecracker
11 Replies

10. What is on Your Mind?

Moving from Desktop View to Mobile View

See attached video for a demo on how to move back and forth from the desktop view to the mobile view. Currently this only works for the home page, but I will work on some new PHP code in the future to make this work with the page we are currently on. Edit: The issue with making every page ... (2 Replies)
Discussion started by: Neo
2 Replies

LEARN ABOUT CENTOS

bashbug-64

BASHBUG(1)						      General Commands Manual							BASHBUG(1)

NAME

       bashbug - report a bug in bash

SYNOPSIS

       bashbug [--version] [--help] [email-address]

DESCRIPTION

       bashbug	is  a shell script to help the user compose and mail bug reports concerning bash in a standard format.	bashbug invokes the editor
       specified by the environment variable EDITOR on a temporary copy of the bug report format outline. The user must fill  in  the  appropriate
       fields  and  exit  the  editor.	 bashbug  then	mails the completed report to bug-bash@gnu.org, or email-address.  If the report cannot be
       mailed, it is saved in the file dead.bashbug in the invoking user's home directory.

       The bug report format outline consists of several sections.  The first section provides information about the  machine,	operating  system,
       the  bash  version, and the compilation environment.  The second section should be filled in with a description of the bug.  The third sec-
       tion should be a description of how to reproduce the bug.  The optional fourth section is for a proposed fix.  Fixes are encouraged.

ENVIRONMENT

       bashbug will utilize the following environment variables if they exist:

       EDITOR Specifies the preferred editor. If EDITOR is not set, bashbug defaults to emacs.

       HOME   Directory in which the failed bug report is saved if the mail fails.

       TMPDIR Directory in which to create temporary files and directories.

SEE ALSO

       bash(1)

AUTHORS

       Brian Fox, Free Software Foundation
       bfox@gnu.org

       Chet Ramey, Case Western Reserve University
       chet@po.cwru.edu

GNU Bash-4.0							   1998 July 30 							BASHBUG(1)
All times are GMT -4. The time now is 07:38 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy