Bash and the PS1 environment variable [was: grep: show matching line from pattern file]
On 6/2/22 17:12, Will Mengarini wrote:
> * David Christensen [22-06/02=Thu 15:50 -0700]:
>> On 6/2/22 15:13, Will Mengarini wrote:
>>> In this transcript, the number before the prompt-ending '$' is $?:
>>> --------------------------------
>>> debian/pts/4 bash3 ~ 14:56 0$perl -e 'open "gweeblefleep" || die'
>>> debian/pts/4 bash3 ~ 14:57 0$perl -e 'open "gweeblefleep" or die'
>>> Died at -e line 1.
>>> debian/pts/4 bash3 ~ 14:57 2$
>>> --------------------------------
>>
>> What is your shell? PS1?
>
> The shell is Bash 5.1.4.
> PS1="\\h/${TTY#/dev/} \\s$SHLVL \\w \\A \$?\\\$"
Interesting.
This is my daily driver:
2022-06-02 17:38:55 dpchrist@laalaa ~
$ cat /etc/debian_version ; uname -a ; dpkg-query -W bash
11.3
Linux laalaa 5.10.0-14-amd64 #1 SMP Debian 5.10.113-1 (2022-04-29)
x86_64 GNU/Linux
bash 5.1-2+b3
This is my PS1. '\u' does not work on all of Debian, FreeBSD, Cygwin,
and macOS, so the expansion of ${USER} is inserted between two string
literals when .profile runs and sets PS1:
2022-06-02 17:39:09 dpchrist@laalaa ~
$ grep PS1 .profile
export PS1='\n\D{%Y-%m-%d %H:%M:%S} '${USER}'@\h \w\n\$ '
#export PS1='\n\D{%Y-%m-%d %H:%M:%S} \u@\h \w\n\$ '
Testing your PS1:
2022-06-02 17:45:03 dpchrist@laalaa ~
$ PS1="\\h/${TTY#/dev/} \\s$SHLVL \\w \\A \$?\\\$"
laalaa/ -bash1 ~ 17:45 0$
The snippet '${TTY#/dev/}' seems to produce ' -' on my computer. How
does your computer produce 'pts/4 ' and what does it mean?
Is there a reason why you are using double quotes, rather than single
quotes?
David
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