Re: nice PS1 with /bin/sh

[Yutaka KAWASE <yutaka@mailhost.net>]

Thank you for your mail, Todd.

Your script worked prefectlly! ;-)

Although there are many tokens that I havn't used before, I'll check
each line and study.

Thank you very much.

-- Original Message --
From: "Todd T. Fries" <todd@fries.net>
Subject: Re: nice PS1 with /bin/sh
Date: Sun, 2 Apr 2000 11:40:39 -0500
Message-ID: <20000402114039.C22351@LightHouse.fries.net>

> But it does not change the prompt for you once you have set it :-(
> 
> On Mon, Apr 03, 2000 at 12:44:24AM +0900, Yutaka KAWASE wrote:
> > 
> > Hello all,
> > 
> > I have been using /usr/local/bin/bash but now tring to get used to
> > /bin/sh.
> > 
> > In my .profile, I wrote;
> > 
> > PS1="$USER@`hostname`:`echo $PWD | perl -pe 's#^$ENV{HOME}#~#'`$ "
> > 
> > and this gives me the prompt of my favorite.
> > 
> > However, I don't want to use perl to set up PS1.
> > I think I should use sed instead but don't know how to do that.
> > 
> > Any suggestions?
> > 
> > 
> > -- 
> > Yutaka KAWASE <yutaka@jpnet.nu>
> 
> alias cd=do_cd
> 
> do_cd() {
> 	builtin cd $@
> 	pwd=${PWD##$HOME}
> 	[ ${#pwd} -lt ${#PWD} ] && pwd="~$pwd"
> 	[ "$hostname" ] || hostname=$(hostname)
> 	PS1="$USER@$hostname:$pwd\$ "
> }
> 
> This is really the same as /bin/ksh on OpenBSD, fwiw.
> 
> Now personally I add a little 'fun' if it's a terminal:
> 
> title() {
>  echo "\033]2;$*\007\c"
> }
> icon() {
>  echo "\033]1;$*\007\c"
> }
> 
> if [ "$TERM" = "xterm" -o "$TERM" = "xterm-color" -o "$TERM" = "screen" ];
> then
> 	[ "$hostname" ] || hostname=$(hostname)
> 	PS1="$hostname\$ "
> 	m=$(uname -m)
> 	s=$(uname -s)
> 	r=$(uname -r)
> 	ver="$m $s $r"
> 	titleicon='icon "$pwd";title "$pwd $(date +%m%d\ %a\ %r) '$LOGNAME'@'$hostname', '$ver'"'
> 	do_cd() {
> 		builtin cd $@
> 		pwd=${PWD##$HOME}
> 		[ ${#pwd} -lt ${#PWD} ] && pwd="~$pwd"
> 		[ "$hostname" ] || hostname=$(hostname)
> 		PS1="$USER@$hostname:$pwd\$ "
> 		eval $titleicon
> 	}
> fi
> 
> Yes, you can set the title with screen, with the following .screenrc stuff:
> 
> termcap  xterm hs@:cs=\E[%i%d;%dr:im=\E[4h:ei=\E[4l
> terminfo xterm hs@:cs=\E[%i%p1%d;%p2%dr:im=\E[4h:ei=\E[4l
> termcap  xterm-color hs@:cs=\E[%i%d;%dr:im=\E[4h:ei=\E[4l
> terminfo xterm-color hs@:cs=\E[%i%p1%d;%p2%dr:im=\E[4h:ei=\E[4l
> termcap  rxvt hs@:cs=\E[%i%d;%dr:im=\E[4h:ei=\E[4l
> terminfo rxvt hs@:cs=\E[%i%p1%d;%p2%dr:im=\E[4h:ei=\E[4l
> 
> register [ "\033:se noai\015a"
> register ] "\033:se ai\015a"
> bind ^] paste [.]
> 
> termcap  xterm 'hs:ts=\E]2;:fs=\007:ds=\E]1;Screen\007'
> terminfo xterm 'hs:ts=\E]2;:fs=\007:ds=\E]1;Screen\007'
> termcap  xterm-color 'hs:ts=\E]2;:fs=\007:ds=\E]1;Screen\007'
> terminfo xterm-color 'hs:ts=\E]2;:fs=\007:ds=\E]1;Screen\007'
> termcap  rxvt 'hs:ts=\E]2;:fs=\007:ds=\E]1;Screen\007'
> terminfo rxvt 'hs:ts=\E]2;:fs=\007:ds=\E]1;Screen\007'
> 
> >... so that when flipping around to different 'screens' within
> screen, you can see the title of your xterm/rxvt/etc change :-)
> 
> You are quite right that perl is not something you want to be
> running from a shell script that gets called alot.  Unless you
> have a really fast machine, you will notice this 'overhead'.
> It's almost always faster to do alot of extra things in
> the native shell language than it is to call another program.
> Same comparison as its easier to do extra cpu stuff to avoid
> hitting the hard drive ..
> 
> Have fun!
> -- 
> Todd Fries .. todd@fries.net


-- 
Yutaka KAWASE <yutaka@oneill.co.jp>