On Fri, Mar 29, 2013 at 04:10:22PM +0100, John Kearney wrote:
> consider
> dethrophes@dethace ~
> $ read -ra vals -d '' <<< $'lkjlksda\n adasd\n:sdasda:'
>
> dethrophes@dethace ~
> $ echo ${vals[0]}
> lkjlksda
You forgot to set IFS=: for that read.
imadev:~$ IFS=: read -ra vals -d '' <<< $'lkjlksda\n adasd\n:sdasda:'
imadev:~$ declare -p vals
declare -a vals='([0]="lkjlksda\
adasd\
" [1]="sdasda" [2]="\
")'
> I meant to update your wiki about it but I forgot.
> I guess read uses gets not fread and that truncates the line anyway.
No, that's not correct.
> >> cat <<EOF ><known_path>/source_wrapper.sh
> >> find_file "${1:?Missing File Name }" || return $?
> >> source "${FOUND_FILE}"
> >> EOF
> >> alias include=source\ "<known_path>/source_wrapper.sh"
> > The <<EOF needs to be <<'EOF' (or similar), and of course you have to
> > include the definition of find_file in the wrapper script.
> ?? why <<'EOF' ??
Because if you don't quote any of the characters in the here document
delimiter, the expansions such as "${FOUND_FILE}" will be done by the
shell that's processing the redirection. I believe you want the code
to appear in the output file. Therefore you want to quote some or all
of the characters in the delimiter.
Compare:
imadev:~$ cat <<EOF
> echo "$HOME"
> EOF
echo "/net/home/wooledg"
imadev:~$ cat <<'EOF'
> echo "$HOME"
> EOF
echo "$HOME"
On Fri, Mar 29, 2013 at 04:18:49PM +0100, John Kearney wrote:
> Oh and FYI
> IFS=: read
> may change the global IFS on some shells I think.
> Mainly thinking of pdksh right now.
If those shells have such a bug, then you'd need to bring it up on THEIR
bug mailing list. This is bug-bash. ;-)
In any case, I've never seen such a bug, and the pdksh to which I have
access does not display it:
...
Get:1 http://ftp.us.debian.org/debian/ squeeze/main pdksh i386 5.2.14-25 [265
kB]
...
arc3:~$ pdksh
\h:\w$ echo a:b:c > /tmp/frob
\h:\w$ IFS=: read a b < /tmp/frob
\h:\w$ rm /tmp/frob
\h:\w$ echo "$IFS"
\h:\w$
This is a fundamental feature that's commonly used. If it were so
egregiously broken I think more people would have noticed it.
