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Re: [bug] Home dir in PS1 not abbreviated to tilde
From: |
Chet Ramey |
Subject: |
Re: [bug] Home dir in PS1 not abbreviated to tilde |
Date: |
Tue, 13 Mar 2012 08:58:40 -0400 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 |
On 3/12/12 12:22 AM, Yongzhi Pan wrote:
> Tested in GNU bash, version 3.00.16(1)-release and 4.1.2(1)-release.
>
> Upon login, home dir is displayed as tilde in PS1:
> pan@BJ-APN-2 ~$ echo $PS1
> \[\033[35m\]\u@\h \w$ \[\033[0m\]
> pan@BJ-APN-2 ~$ pwd
> /export/home/pan/
>
> After a cd command, which change directory to $HOME (not changed at all),
> it is displayed as the complete path:
> pan@BJ-APN-2 ~$ cd
> pan@BJ-APN-2 /export/home/pan$
Strictly speaking, the tilde prefix only extends up to the first slash.
Pathname canonicalization cuts off the final slash of the directory
name, so the directory target of `cd' (and therefore $PWD) won't match
$HOME, and you won't get the abbreviation. I'm surprised it matches the
first time, but the pathname you get from the environment probably hasn't
been canonicalized.
Chet
>
> The reason is that my home in passwd has a trailing slash:
> pan@BJ-APN-2 /export/home/pan$ grep ^$USER: /etc/passwd
> pan:x:896:1::/export/home/pan/:/bin/bash
This isn't a good idea in any case.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/
- Re: [bug] Home dir in PS1 not abbreviated to tilde, (continued)
- Re: [bug] Home dir in PS1 not abbreviated to tilde, Eric Blake, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, dethrophes, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, Eric Blake, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, dethrophes, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, Eric Blake, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, dethrophes, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, Andreas Schwab, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, dethrophes, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, Eric Blake, 2012/03/13
- Re: [bug] Home dir in PS1 not abbreviated to tilde, dethrophes, 2012/03/13
Re: [bug] Home dir in PS1 not abbreviated to tilde,
Chet Ramey <=