Re: :t and getting senile.

2006-09-25, 12:22(-07), george.e.sullivan@xxxxxxxx:
Ok, I know I am getting old. I can't remember where I saw this, but
how do you strip off the end of string such as a command line string so
that you just get the last part after the slash bar?

Ex: /here/there/everywhere/hello.

There was something I saw somewhere with a :t that would just give me
the hello part.
[...]

That's a csh feature also found in tcsh and zsh. That comes from
history substitution. bash implemented csh history substitution
but didn't go as far as that.

$file:r (rest (without extension)) $file:h (head), $file:t
(tail).

With bash it's only available via the csh-like history
substitution:

It can also be found in vim. :cd %:h changes vim current
directory the the directory part of the currently edited file.

bash-3.1$ echo a/b.c
a/b.c
bash-3.1$ echo !$:t
echo b.c
b.c

bash copied the bogus ${array:index:length} from ksh that makes
it not-really-compatible with ${var:modifier}. zsh used the more
sensible ${var[start,end]}, so was able to borrow the
$var:modifier from csh.

$var:h in zsh gives the dirname even for the cases where
${var%/*} fails such as when var=foo (not with csh or tcsh).
Same for $var:t vs ${var##*/} when var=/foo/.

--
Stéphane
.

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