On Mon, Jan 13, 2025, at 3:03 AM, Félix Hauri wrote:
> Re-reading man page and this discussion, I thing either this variable is
> wrongly named "IFS", as `S` stand for "separator"
Okay. Not like it's going to change.
> Btw, the command "mapfile" (readarray) seem more suitable** than "read" for
> splitting an array on delimiter. (** constant)
"Suitable" and "constant" don't mean remotely the same thing.
Perhaps you mean "consistent".
> $ printf ' %-15s %-30s%s\n' String by\ Read{,Array};while IFS= read -r
> line;
> do
> IFS=: read -r _k _v1 _v2 <<<"$line"
> readarray -td: array < <(printf %s "$line");
> k="${array[0]}" v1="${array[1]}";
> IFS=:; v2=${array[*]:2}; IFS=$' \t\n';
> printf " %-15s k=%-3s v1=%-4s v2=%-11s k=%-3s v1=%-4s v2=%-11s\n" \
> "${line@Q}" "${_k@Q}" "${_v1@Q}" "${_v2@Q}" \
> "${k@Q}" "${v1@Q}" "${v2@Q}";
> done < <(
> printf '%s\n' \
> k{:v1{:v2{:v3{:{:{:,},},},:{:{:,},},},:{:{:,},},},:{:{:,},},} )
>
> String by Read by ReadArray
> 'k:v1:v2:v3:::' k='k' v1='v1' v2='v2:v3:::' k='k' v1='v1' v2='v2:v3::'
> 'k:v1:v2:v3::' k='k' v1='v1' v2='v2:v3::' k='k' v1='v1' v2='v2:v3:'
> 'k:v1:v2:v3:' k='k' v1='v1' v2='v2:v3:' k='k' v1='v1' v2='v2:v3'
> 'k:v1:v2:v3' k='k' v1='v1' v2='v2:v3' k='k' v1='v1' v2='v2:v3'
> 'k:v1:v2:::' k='k' v1='v1' v2='v2:::' k='k' v1='v1' v2='v2::'
> 'k:v1:v2::' k='k' v1='v1' v2='v2::' k='k' v1='v1' v2='v2:'
> 'k:v1:v2:' k='k' v1='v1' v2='v2' k='k' v1='v1' v2='v2'
> 'k:v1:v2' k='k' v1='v1' v2='v2' k='k' v1='v1' v2='v2'
> 'k:v1:::' k='k' v1='v1' v2='::' k='k' v1='v1' v2=':'
> 'k:v1::' k='k' v1='v1' v2='' k='k' v1='v1' v2=''
> 'k:v1:' k='k' v1='v1' v2='' k='k' v1='v1' v2=''
> 'k:v1' k='k' v1='v1' v2='' k='k' v1='v1' v2=''
> 'k:::' k='k' v1='' v2='' k='k' v1='' v2=''
> 'k::' k='k' v1='' v2='' k='k' v1='' v2=''
> 'k:' k='k' v1='' v2='' k='k' v1='' v2=''
> 'k' k='k' v1='' v2='' k='k' v1='' v2=''
What exactly is all of this supposed to demonstrate? mapfile has
the same terminator-not-separator behavior everyone is kvetching
about:
$ printf 'a:b:c:' | { mapfile -td:; declare -p MAPFILE; }
declare -a MAPFILE=([0]="a" [1]="b" [2]="c")
Reading a line and splitting it into an array like this is what
read -a is for.
--
vq
