Quick array assignment from command...
> On Tue, Mar 30, 2021 at 12:42:46PM -0400, Eric Cook wrote:
> > eval 'tags=('"${*@Q}"\)
On Tue, Mar 30, 2021 at 01:16:14PM -0400, Greg Wooledge wrote:
> declare -A tags=()
> while IFS=\| read -r tag value; do
> tags[$tag]=$value
> done < <(exiftool ...)
As bash read loop could be something slow, I use (when I'm quiet about data
origin) something like:
declare -A tags="($(
sed -e 's/^\([^|]*\)|\?\(.*\)/[\1]="\2"/' < <(
exiftool ...)) )"
Then
declare -p tags
declare -A tags=([Title]="A2 - Northern Lights" [Artist]="AK420"
[Genre]="lofi" [Track]="" )
Note `|\?` in sed command will ensure EACH line would be ouput as `[LHS]="RHS"`
even if RHS is empty and pipe separator is missing.
But I have to confess: If not worst than using `eval`,
I'm not absolutely sure about border effect and security issues.
Other sample, there is a quick `tcpstat` working on Linux:
declare -a fds=(/proc/[1-9]*/fd/*)
declare -a sockets="($(
sed < <(ls -l "${fds[@]}" 2>&1
) -ne 's@^.*proc/\([0-9]\+\)/.*socket:.\([0-9]\+\).@[\2]+="\1 "@p'))"
while IFS=': ' read foo{,} port foo{,} mode foo{,,,,,,} node foo; do
[ "$mode" = "0A" ] && [ "${sockets[node]}" ] &&
while IFS= read -ru $lps line; do
printf '%8d %s\n' 0x$port "$line"
done {lps}< <(ps h ${sockets[node]})
done < /proc/net/tcp
Where, when (not associative) array is declared as
declare -a sockets=( [12345]+="1234 " [123]+="234 " [12345]+="456 " )
they hold:
declare -p sockets
declare -a sockets=([123]="234 " [12345]="1234 456 ")
--
Félix Hauri - <[email protected]> - http://www.f-hauri.ch
