Path: csiph.com!xmission!news.snarked.org!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail From: Dennis Williamson Newsgroups: gnu.bash.bug Subject: Re: Undocumented feature: Unnamed fifo '<(:)' Date: Sun, 28 Jun 2020 10:55:59 -0500 Lines: 38 Approved: bug-bash@gnu.org Message-ID: References: <20200628134945.GB24863@medium.hauri> NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Trace: usenet.stanford.edu 1593359779 25077 209.51.188.17 (28 Jun 2020 15:56:19 GMT) X-Complaints-To: action@cs.stanford.edu Cc: bug-bash To: felix Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=D910g+SJhxRIWHx2vyEb+UbBXm6+fA9UkJUXw7augjw=; b=vfNgEJGXPmAwfwPL81jo7sqSN9fKoEQRovlFkPhoYExl6i2qsZ9yaIqE7cNUnptqz2 Gwti9TY5kLw7GrbXIpyua9oY4RK56h8s71aX/K4P+wuF3cGnlh6LKWZ0HH11ImUTdLwg 9VYtz54mnBZnlYl6ZbxlpyrfPcqpHteJj21DxD+BmjCPfgkuNWwFSC2ES2B1e/cRzF+I UH7sclyvmg8B8gjealjatoI+LPKqUORDotGDwJRzOAP6q3zxFMHi2jHN+e9eWGBfauUI xIiVMX+7OTDaXKokxTTp1fzuKf2m8bHZTJZrIJyPXjZgJnZuDx8wKS4BOBXf3t+ilypF qn1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=D910g+SJhxRIWHx2vyEb+UbBXm6+fA9UkJUXw7augjw=; b=RDJmwbUHlCFexFJpjTpcMAXg1H4ZKfYmaRGXSwnce6YqGEbxdjhv09UA2uleB6BwM3 sAurl2kols/VpRYmMtDjqfsWuqnaIl7vL/34sRu5LrrjlcapESIgxjirY5wR0yKp97wW fch1Nqvgp+qs+F+3w9fGeoI1ekgRPdq8IFe7+7vC8wOhbjpp9cojwJqYiwcu9zhKq3Iq fwWTo0YL1MqeJ8U1/uIBWAYNhG+LY92KJ7GLNJ3z1bZXAHkJXlnQOsWdPPCMqdF/Uklg sT+IgLTghAjIlc9o3/7BhUzVmbhSfnJ2DTt0MoaPpgn5T0brl2zu7WJMd+xp4uvUV+hN u08w== X-Gm-Message-State: AOAM5305vAYNxOwfg1dhfM8ABMVHjasx6RqH5Btt7rQXQZUO+G8uw+DM e+s5WaF9+9gInRKnh14laIiHMcvQ5yYlLYCAdA== X-Google-Smtp-Source: ABdhPJx1cvgTGcEdUgh7uofMz9WmIkz5whWGHuZ3CatbpxjJp3oCR2B0a6SmCK3Zu46RZs/94AzerSWAe++OuSrc+TU= X-Received: by 2002:a1c:a512:: with SMTP id o18mr12941860wme.101.1593359771759; Sun, 28 Jun 2020 08:56:11 -0700 (PDT) In-Reply-To: <20200628134945.GB24863@medium.hauri> Received-SPF: pass client-ip=2a00:1450:4864:20::329; envelope-from=dennistwilliamson@gmail.com; helo=mail-wm1-x329.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-Content-Filtered-By: Mailman/MimeDel 2.1.23 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Mailman-Original-Message-ID: X-Mailman-Original-References: <20200628134945.GB24863@medium.hauri> Xref: csiph.com gnu.bash.bug:16467 On Sun, Jun 28, 2020, 8:50 AM felix wrote: > > _out=$(date -d "$_string" +%s) > many time in same script, I run something like: > > _fifo=$(mktemp -u /tmp/fifo-XXXXXXXX) > mkfifo $_fifo > exec 9> >(exec stdbuf -o0 date -f - +%s >$_fifo 2>&1) > exec 8<$_fifo > rm $_fifo > > Then to convert human datetime to UNIX SECONDS: > > echo >&9 $_string > read -t 1 -u 8 _out > > How is running your echo >&9 $_string read -t 1 -u 8 _out many times better than running your _out=$(date -d "$_string" +%s) many times? Why don't you just use a function? date_to_epoch () { date -d "$1" +%s } _out=$(date_to_epoch "$_string")