zsh-users
 help / color / mirror / code / Atom feed
From: Daniel Shahaf <d.s@daniel.shahaf.name>
To: Anssi Saari <as@sci.fi>
Cc: zsh-users@zsh.org
Subject: Re: Confused about splitting
Date: Sun, 31 Mar 2019 13:12:04 +0000	[thread overview]
Message-ID: <20190331131204.mpyahlfvy2dxe63f@tarpaulin.shahaf.local2> (raw)
In-Reply-To: <vg3k1gf4dmf.fsf@coffee.modeemi.fi>

Anssi Saari wrote on Sun, Mar 31, 2019 at 12:06:16 +0300:
> foofunc3 () {
> 	if [[ $# -ge 1 ]]
> 	then
> 		if=$1 
> 	else
> 		if=eno1
> 	fi
> 	while read g
> 	do
> 	    if [[ $g =~ $if ]]
> 	    then
> 		first=${=g}
> 		break
> 	    fi
> 	done < /proc/net/dev
> 
> 	echo $first
> 	echo length of first is $#first
> }

Here's another solution:

     1	% () {
     2	    : ${1:=enp2s0}
     3	    local -a net_dev_lines=( "${(@f)"$(</proc/net/dev)"}" )
     4	    local line=${${(M)net_dev_lines:#*$1*}[1]}
     5	    print -r -- $=line
     6	    print -r -- ${#${=line}}
     7	  }
     8	17
     9	% 

Line 2 sets $1 to "enp2s0" if it's not already set.

Line 3 slurps the target file (the «$(<…)») and splits it into lines (the «${(f)}»).

Line 4 greps it (that's the :# and the (M) together) and takes the first result
(that's the outer «${…[1]}» construct).

Line 6 splits it, takes the length of the intermediate array, and prints that.

Cheers,

Daniel

  parent reply	other threads:[~2019-03-31 13:12 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-31  9:06 Anssi Saari
2019-03-31 12:58 ` Daniel Shahaf
2019-03-31 17:56   ` Anssi Saari
2019-03-31 13:12 ` Daniel Shahaf [this message]
2019-04-01  9:07   ` Anssi Saari

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190331131204.mpyahlfvy2dxe63f@tarpaulin.shahaf.local2 \
    --to=d.s@daniel.shahaf.name \
    --cc=as@sci.fi \
    --cc=zsh-users@zsh.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://git.vuxu.org/mirror/zsh/

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).