> Does ksh have an API to edit a file at a specific position pos1, read
> n1 bytes, and write n1 bytes at that position without truncating the
> file? I need this to do edit a file in place without reading and
> writing it completely each time.
Yes, ksh has seek redirection operators.
Here's an ad hoc example (not sure whether the features are
applied proficiently, but it seems to work :-)
f=somefile
cat <<EOT >"$f"
Hello world!
My good friend.
How are you?
EOT
function fun ## palindrome (just for example)
{
arg=$1 x=
(( len=${#arg} ))
for ((i=0; i<len; i++))
do res=${arg:i:1}$res
done
printf "%s" "$res"
}
pos1=18
n1=8
read -N "$n1" content 0<>"$f" <#((pos1))
printf "%s" "$(fun "$content")" 1<>"$f" >#((pos1))
Outputs:
Hello world!
My goneirf dod.
How are you?
Hope it's of some use to you.
Janis
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