Lets say:
PS1="[${INSTALL_DIR##*/}]"
Bash is able to evalute it for the first time; but later, after INSTALL_DIR's value changes, Bash prompt wouldn't change accordingly. So is there a systematic way to force BASH to reflect the change?
Thanks. -tk
5 minutes after sending out the email, I think I've just found the answer:
PS1="[\${INSTALL_DIR##*/}]"The reason seems to be that "\$" makes a literal "$" so shell doesn't expand the "${}" immediately, which gives it a second chance for evaluation upon each new prompt.
Shell expansion/substitution has been confusing to me, since the KSH days, and it continues to be :)
-tk
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