Re: current directory and use of login scripts

On Wed, 26 May 2021 19:45:13 -0500, Daniel L Newhouse
<[email protected]> wrote:


The most important bash file, .bash_profile, is read and the commands
in it executed by bash every time you log in to the system. If you
examine your .bash_profile you will probably see lines similar to:
PATH =/ sbin:/ usr/ sbin:/ bin:/ usr/ bin:/ usr/ local/ bin SHELL =/
bin/ bash MANPATH =/ usr/ man:/ usr/ X11/ man EDITOR =/ usr/ bin/ vi

Cameron Newham. Learning the bash Shell (In a Nutshell (O'Reilly))
(pp. 88-89). O'Reilly Media. Kindle Edition. 


>On Fri, 23 Apr 2021 15:31:46 -0500, Daniel L Newhouse
><[email protected]> wrote:
>
>Usually, do not use the .profile script.  Furthermore, 
>
>One advantage of bash’s ability to look for either synonym is that you
>can retain your .profile if you have been using the Bourne shell. If
>you need to add bash-specific commands, you can put them in
>.bash_profile followed by the command source .profile. When you log
>in, all the bash-specific commands will be executed, and bash will
>source .profile, executing the remaining commands. If you decide to
>switch to using the Bourne shell you don’t have to modify your
>existing files. A similar approach was intended for .bash_login and
>the C shell .login, but due to differences in the basic syntax of the
>shells, this is not a good idea. .bash_profile is read and executed
>only by the login shell. If you start up a new shell (a subshell) by
>typing bash on the command line, it will attempt to read commands from
>the file .bashrc. This scheme allows you the flexibility to separate
>startup commands needed at login time from those you might need when
>you run a subshell. If you need to have the same commands run
>regardless of whether it is a login shell or a subshell, you can just
>use the source command from within .bash_profile to execute .bashrc.
>If .bashrc doesn’t exist then no commands are executed when you start
>up a subshell.
>
>Cameron Newham. Learning the bash Shell (In a Nutshell (O'Reilly))
>(pp. 89-90). O'Reilly Media. Kindle Edition. 
>
>>On Wed, 21 Apr 2021 20:36:36 -0500, Daniel L Newhouse
>><[email protected]> wrote:
>>
>>A file must have copy and delete enabled for the move command to work
>>on it.
>>
>>>On Wed, 21 Apr 2021 20:04:17 -0500, Daniel L Newhouse
>>><[email protected]> wrote:
>>>
>>>
>>>ls -al is the way to view files in Unix.  That way you can see your
>>>startup scripts and the write permissions on your files.  Change the
>>>write permissions with chmod.
>>>
>>>
>>>>On Tue, 20 Apr 2021 12:52:34 -0500, Daniel L Newhouse
>>>><[email protected]> wrote:
>>>>
>>>>There is a web site on all the prompt strings
>>>>
>>>>https://idojo.co/how-to-set-a-custom-bash-shell-prompt-string-ps0-ps1-ps2-ps3-ps4-in-linux/
>>>>
>>>>PS1    The  value  of  this parameter is expanded (see PROMPTING
>>>>below)
>>>>       and used as the primary prompt string.   The  default  value is
>>>>       ``\s-\v\$ ''.
>>>>PS2    The  value of this parameter is expanded as with PS1 and used
>>>>as
>>>>       the secondary prompt string.  The default is ``> ''.
>>>>PS3    The value of this parameter is used as the prompt for the
>>>>select
>>>>       command (see SHELL GRAMMAR above).
>>>>PS4    The  value  of  this  parameter  is expanded as with PS1 and
>>>>the
>>>>       value is printed before each command bash displays during an
>>>>ex-
>>>>       ecution trace.  The first character of the expanded value of
>>>>PS4
>>>>       is replicated multiple times, as necessary, to indicate
>>>>multiple
>>>>       levels of indirection.  The default is ``+ ''.
>>>>
>>>>
>>>>>On Mon, 19 Apr 2021 10:02:42 -0500, Daniel L Newhouse
>>>>><[email protected]> wrote:
>>>>>
>>>>>
>>>>>.profile is the login script.  
>>>>>
>>>>>PS1 is called a "prompt string."
>>>>>
>>>>>>On Sat, 17 Apr 2021 23:48:43 -0500, Daniel L Newhouse
>>>>>><[email protected]> wrote:
>>>>>>
>>>>>>.bashrc in the home directory is the startup script.
>>>>>>
>>>>>>>On Sun, 28 Mar 2021 19:52:47 -0500, Daniel L Newhouse
>>>>>>><[email protected]> wrote:
>>>>>>>
>>>>>>>"\s-\v\w$" is the best it will ever be, a $ before the prompt.  
>>>>>>>
>>>>>>>
>>>>>>>>On Sun, 28 Mar 2021 18:40:31 -0500, Daniel L Newhouse
>>>>>>>><[email protected]> wrote:
>>>>>>>>
>>>>>>>>The fact that there is no startup script, however, means that you have
>>>>>>>>to change PS1 every time you restart cygwin!
>>>>>>>>
>>>>>>>>I also vote for Minix compatibility.
>>>>>>>>
>>>>>>>>>On Sun, 28 Mar 2021 18:35:48 -0500, Daniel L Newhouse
>>>>>>>>><[email protected]> wrote:
>>>>>>>>>
>>>>>>>>>>K, the syntax is "\s-\v\w".  What I posted was a typo.  Parts of these
>>>>>>>>>>Kindle books aren't searchable.  Try searching on "PS1" to find it in
>>>>>>>>>>Bash from O'Reilly.  
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>Also, IIRC, ending the prompt with a '~' indicates a working
>>>>>>>>>directory, which is normal, whereas ending it with a '$' indicates an
>>>>>>>>>absolute path.