19 Apr
2017
19 Apr
'17
2:35 p.m.
On Tue, Apr 18, 2017 at 05:50:05PM -0700, Lyndon Nerenberg wrote:
I don't want to get into an argument in an off-topic sub-thread, but PS1
doesn't need to be exported, and since the shell evaluates the string,
you may as well use
LOGNAME=$(id -un) # should already be set
HOSTNAME=$(hostname -s) # -s is fairly portable (not on Solaris tho)
PS1=': $LOGNAME@$HOSTNAME: $PWD; '
This saves having to execute id and hostname on every new prompt.
Also note that this has nothing to do with the : command.
Cheers
Ron said:
I still remember using : for a comment in the V6
shell. Was also the label
for goto.
What's cool about ':' vs. '#' is:
-----8<-----8<-----8<-----8<-----8<-----8<-----
function cd {
command cd "$@" && setprompt
}
function setprompt {
PS1=": "`id -un`@`hostname|sed 's;\..*$;;'`:'${PWD};
'; export PS1
}
setprompt
-----8<-----8<-----8<-----8<-----8<-----8<-----
Stick that in your .env and you get a snarf-and-barf'able shell prompt that evals as
a noop. Blatantly ripped off from plan9port IIRC. I run this across all manner of *BSD
and Solaris and Linux and it just works.
--lyndon