Open a file with line numbers in more (AIX)

See if /usr/bin/ksh93 is available:

ksh93 --version

If it says

version         sh (AT&T Research)

then use that as your interactive shell. It will have the ${.sh.version} and should have the TAB expansion.

In ksh, you can only use single digit for explicit file descriptor. With ksh93r and above, you can open more than 10 file descriptor by using the form:

{var}>filename

(bash and zsh copied this feature later).

ksh will pick available file descriptor greater than or equal to 10, store file descriptor number in variable var:

$ exec {var1}>/tmp/test1
$ echo "$var1"
10
$ exec {var2}>/tmp/test2
$ echo "$var2"
11