From unknown Fri Aug 15 18:06:18 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#35339 <35339@debbugs.gnu.org> To: bug#35339 <35339@debbugs.gnu.org> Subject: Status: Say what buffering is not --line-buffered Reply-To: bug#35339 <35339@debbugs.gnu.org> Date: Sat, 16 Aug 2025 01:06:18 +0000 retitle 35339 Say what buffering is not --line-buffered reassign 35339 grep submitter 35339 =E7=A9=8D=E4=B8=B9=E5=B0=BC Dan Jacobson severity 35339 wishlist thanks From debbugs-submit-bounces@debbugs.gnu.org Sat Apr 20 08:22:17 2019 Received: (at submit) by debbugs.gnu.org; 20 Apr 2019 12:22:17 +0000 Received: from localhost ([127.0.0.1]:45898 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hHp0b-0000E7-89 for submit@debbugs.gnu.org; Sat, 20 Apr 2019 08:22:17 -0400 Received: from eggs.gnu.org ([209.51.188.92]:39888) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hHp0Z-0000Dt-37 for submit@debbugs.gnu.org; Sat, 20 Apr 2019 08:22:15 -0400 Received: from lists.gnu.org ([209.51.188.17]:45478) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hHp0R-00047s-Uo for submit@debbugs.gnu.org; Sat, 20 Apr 2019 08:22:08 -0400 Received: from eggs.gnu.org ([209.51.188.92]:54252) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hHp0Q-0001Cf-UN for bug-grep@gnu.org; Sat, 20 Apr 2019 08:22:07 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: * X-Spam-Status: No, score=1.8 required=5.0 tests=BAYES_50,FROM_EXCESS_BASE64, RCVD_IN_DNSWL_NONE,URIBL_BLOCKED autolearn=disabled version=3.3.2 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hHp0P-000447-IF for bug-grep@gnu.org; Sat, 20 Apr 2019 08:22:06 -0400 Received: from firebrick.maple.relay.mailchannels.net ([23.83.214.59]:25585) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hHp0P-000421-A1 for bug-grep@gnu.org; Sat, 20 Apr 2019 08:22:05 -0400 X-Sender-Id: dreamhost|x-authsender|jidanni@jidanni.org Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id 7E23C8C128A for ; Sat, 20 Apr 2019 12:22:03 +0000 (UTC) Received: from pdx1-sub0-mail-a9.g.dreamhost.com (100-96-4-125.trex.outbound.svc.cluster.local [100.96.4.125]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id F2CB98C0DAC for ; Sat, 20 Apr 2019 12:22:02 +0000 (UTC) X-Sender-Id: dreamhost|x-authsender|jidanni@jidanni.org Received: from pdx1-sub0-mail-a9.g.dreamhost.com ([TEMPUNAVAIL]. [64.90.62.162]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384) by 0.0.0.0:2500 (trex/5.17.2); Sat, 20 Apr 2019 12:22:03 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|jidanni@jidanni.org X-MailChannels-Auth-Id: dreamhost X-Bitter-Desert: 7a0c75db6db36717_1555762923300_870346538 X-MC-Loop-Signature: 1555762923299:2033210815 X-MC-Ingress-Time: 1555762923299 Received: from pdx1-sub0-mail-a9.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a9.g.dreamhost.com (Postfix) with ESMTP id 90D0980182 for ; Sat, 20 Apr 2019 05:21:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=jidanni.org; h=from:to :subject:date:message-id:mime-version:content-type :content-transfer-encoding; s=jidanni.org; bh=dyeWIaXipIV7CKUEoz MSYnYAQAY=; b=Xt9FCuub/m+Jx86ueyls9+86CMXTG84bWJIyIKZFfGiZWY/SJi y6RYwFpq9KyF8VdpGJSJu0M3XfoFDqkPU5ScXi8tJJ919mZ7Xfm7hTmUiBsoVjIw syGLS+cR5+gTnF+npWktZJGIzaYkXx73OiBDMQ6f9naJNHMn5UQbyB14U= Received: from jidanni.org (1-170-81-233.dynamic-ip.hinet.net [1.170.81.233]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: jidanni@jidanni.org) by pdx1-sub0-mail-a9.g.dreamhost.com (Postfix) with ESMTPSA id 3E2CC8017F for ; Sat, 20 Apr 2019 05:21:57 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a9 From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson To: bug-grep@gnu.org Subject: Say what buffering is not --line-buffered Date: Sat, 20 Apr 2019 19:41:44 +0800 Message-ID: <87ef5wzyx3.5.fsf@jidanni.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 X-VR-OUT-STATUS: OK X-VR-OUT-SCORE: 0 X-VR-OUT-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrgeduuddrgedtgdegudcutefuodetggdotefrodftvfcurfhrohhfihhlvgemucggtfgfnhhsuhgsshgtrhhisggvpdfftffgtefojffquffvnecuuegrihhlohhuthemuceftddtnecunecujfgurhephffvufffkfggtgfgsehtkeertddttdejnecuhfhrohhmpejnnjjnucffrghnucflrggtohgsshhonhcuoehjihgurghnnhhisehjihgurghnnhhirdhorhhgqeenucfkphepuddrudejtddrkedurddvfeefnecurfgrrhgrmhepmhhouggvpehsmhhtphdphhgvlhhopehjihgurghnnhhirdhorhhgpdhinhgvthepuddrudejtddrkedurddvfeefpdhrvghtuhhrnhdqphgrthhhpeeprehuthhfqdekreeureehiehmpfehnfhiheehsgevkeerpecuffgrnhculfgrtghosghsohhnuceojhhiuggrnhhnihesjhhiuggrnhhnihdrohhrgheqpdhmrghilhhfrhhomhepjhhiuggrnhhnihesjhhiuggrnhhnihdrohhrghdpnhhrtghpthhtohepsghughdqghhrvghpsehgnhhurdhorhhgnecuvehluhhsthgvrhfuihiivgepfe Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 23.83.214.59 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Spam-Score: -1.3 (-) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -2.3 (--) On (info "(grep) Other Options") =E2=80=98--line-buffered=E2=80=99 Use line buffering on output. This can cause a performance penalty. OK, but say what will happen if one doesn't use this. Paragraph buffering? Page buffering? From debbugs-submit-bounces@debbugs.gnu.org Tue Sep 22 14:00:25 2020 Received: (at 35339-done) by debbugs.gnu.org; 22 Sep 2020 18:00:25 +0000 Received: from localhost ([127.0.0.1]:33286 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kKmaX-0001LS-J1 for submit@debbugs.gnu.org; Tue, 22 Sep 2020 14:00:25 -0400 Received: from zimbra.cs.ucla.edu ([131.179.128.68]:55314) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kKmaV-0001LC-Tf for 35339-done@debbugs.gnu.org; Tue, 22 Sep 2020 14:00:25 -0400 Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id 954E4160057; Tue, 22 Sep 2020 11:00:17 -0700 (PDT) Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id DDh6umFjPimV; Tue, 22 Sep 2020 11:00:16 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id B57E91600F3; Tue, 22 Sep 2020 11:00:16 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id CavY05be7lMb; Tue, 22 Sep 2020 11:00:16 -0700 (PDT) Received: from [192.168.1.9] (cpe-23-243-218-95.socal.res.rr.com [23.243.218.95]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 86FA4160057; Tue, 22 Sep 2020 11:00:16 -0700 (PDT) Subject: Re: bug#35339: Say what buffering is not --line-buffered To: =?UTF-8?B?56mN5Li55bC8IERhbiBKYWNvYnNvbg==?= References: <87ef5wzyx3.5.fsf@jidanni.org> From: Paul Eggert Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptUUlOQkV5QWNtUUJFQURB QXlIMnhvVHU3cHBHNUQzYThGTVpFb243NGRDdmM0K3ExWEEySjJ0QnkycHdhVHFmCmhweHhk R0E5Smo1MFVKM1BENGJTVUVnTjh0TFowc2FuNDdsNVhUQUZMaTI0NTZjaVNsNW04c0thSGxH ZHQ5WG0KQUF0bVhxZVpWSVlYL1VGUzk2ZkR6ZjR4aEVtbS95N0xiWUVQUWRVZHh1NDd4QTVL aFRZcDVibHRGM1dZRHoxWQpnZDdneDA3QXV3cDdpdzdlTnZub0RUQWxLQWw4S1lEWnpiRE5D UUdFYnBZM2VmWkl2UGRlSStGV1FONFcra2doCnkrUDZhdTZQcklJaFlyYWV1YTdYRGRiMkxT MWVuM1NzbUUzUWpxZlJxSS9BMnVlOEpNd3N2WGUvV0szOEV6czYKeDc0aVRhcUkzQUZINmls QWhEcXBNbmQvbXNTRVNORnQ3NkRpTzFaS1FNcjlhbVZQa25qZlBtSklTcWRoZ0IxRApsRWR3 MzRzUk9mNlY4bVp3MHhmcVQ2UEtFNDZMY0ZlZnpzMGtiZzRHT1JmOHZqRzJTZjF0azVlVThN Qml5Ti9iClowM2JLTmpOWU1wT0REUVF3dVA4NGtZTGtYMndCeHhNQWhCeHdiRFZadWR6eERa SjFDMlZYdWpDT0pWeHEya2wKakJNOUVUWXVVR3FkNzVBVzJMWHJMdzYrTXVJc0hGQVlBZ1Jy NytLY3dEZ0JBZndoUEJZWDM0blNTaUhsbUxDKwpLYUhMZUNMRjVaSTJ2S20zSEVlQ1R0bE9n N3haRU9OZ3d6TCtmZEtvK0Q2U29DOFJSeEpLczhhM3NWZkk0dDZDCm5yUXp2SmJCbjZneGRn Q3U1aTI5SjFRQ1lyQ1l2cWwyVXlGUEFLK2RvOTkvMWpPWFQ0bTI4MzZqMXdBUkFRQUIKdENC UVlYVnNJRVZuWjJWeWRDQThaV2RuWlhKMFFHTnpMblZqYkdFdVpXUjFQb2tDVlFRVEFRZ0FQ d0liQXdZTApDUWdIQXdJR0ZRZ0NDUW9MQkJZQ0F3RUNIZ0VDRjRBV0lRUitONUtwMkt6MzFq TzhGWWp0bCtrT1lxcCtOQVVDClh5Vzlsd1VKRks0THN3QUtDUkR0bCtrT1lxcCtOS05WRC85 SE1zSTE2MDZuMFV1VFhId0lUc3lPakFJOVNET1QKK0MzRFV2NnFsTTVCSDJuV0FNVGlJaXlB NXVnbHNKdjkzb2kydk50RmYvUS9tLzFjblpXZ25WbkV4a3lMSTRFTgpTZDF1QnZyMC9sQ1Nk UGxQME1nNkdXU3BYTXUreDB2ZFQwQWFaTk9URTBGblB1b2xkYzNYRDc2QzJxZzhzWC9pCmF4 WFRLSHk5UCtCbEFxL0NzNy9weERRMEV6U24wVVNaMkMwbDV2djRQTXBBL3BpY25TNks2MDlK dkRHYU9SbXcKWmVYSVpxUU5aVitaUXMrVVl0Vm9ndURUcWJ5M0lVWTFJOEJsWEhScHRhajlB TW40VW9oL0NxcFFsVm9qb3lXbApIcWFGbm5KQktlRjBodko5U0F5YWx3dXpBakc3dlFXMDdN WW5jYU9GbTB3b2lLYmc1SkxPOEY0U0JUSWt1TzBECkNmOW5MQWF5NlZzQjRyendkRWZSd2pQ TFlBbjdNUjNmdkhDRXpmcmtsZFRyYWlCTzFUMGllREs4MEk3c0xmNnAKTWVDWUkxOXBVbHgw L05STUdDZGRpRklRZGZ0aEtXWEdSUzVMQXM4andCZjhINkc1UFdpblByRUlhb21JUDIxaQp2 dWhRRDA3YllxOUlpSWRlbGpqVWRIY0dJMGkvQjRNNTZaYWE4RmYzOGluaU9sckRZQ21ZV1I0 ZENXWml1UWVaCjNPZ3FlUXM5YTZqVHZnZERHVm1SVnFZK2p6azhQbGFIZmNvazhST2hGY0hL a2NmaHVCaEwyNWhsUklzaFJET0UKc2tYcUt3bnpyYnFnYTNHWFpYZnNYQW9GYnpOaExkTHY5 QStMSkFZU2tYUDYvNXFkVHBFTFZHb3N5SDg4NFZkYgpCcGtHSTA0b1lWcXVsYmtDRFFSTWdI SmtBUkFBcG9YcnZ4UDNESWZqQ05PdFhVL1Bkd01TaEtkWC9SbFNzNVBmCnVuVjF3YktQOGhl clhIcnZRZEZWcUVDYVRTeG1saHpiazhYMFBrWTlnY1ZhVTJPNDlUM3FzT2QxY0hlRjUyWUYK R0V0MExoc0JlTWpnTlg1dVoxVjc2cjhneWVWbEZwV1diMFNJd0pVQkhyRFhleEY2N3VwZVJi MnZkSEJqWUROZQp5U24rMEI3Z0ZFcXZWbVp1K0xhZHVkRHA2a1FMamF0RnZIUUhVU0dOc2hC bmtrY2FUYmlJOVBzdDBHQ2MyYWl6Cm5CaVBQQTJXUXhBUGxQUmgzT0dUc241VEhBRG1ianFZ NkZFTUxhc1ZYOERTQ2JsTXZMd05lTy84U3h6aUJpZGgKcUxwSkNxZFFSV0hrdTVYeGdJa0dl S096NU9MRHZYSFdKeWFmckVZamprUzZBazZCNXo2c3ZLbGlDbFduakhRYwpqbFB6eW9GRmdL VEVmY3FEeENqNFJZMEQwRGd0RkQwTmZ5ZU9pZHJTQi9TelRlMmh3cnlRRTNycFNpcW8rMGNH CmR6aDR5QUhLWUorVXJYWjRwOTNaaGpHZktEMXhsck5ZRGxXeVc5UEdtYnZxRnVEbWlJQVFm OVdEL3d6RWZJQ2MKK0YrdURESSt1WWtSeFVGcDkyeWttZGhERUZnMXlqWXNVOGlHVTY5YUh5 dmhxMzZ6NHpjdHZicWhSTnpPV0IxYgpWSi9kSU1EdnNFeEdjWFFWRElUN3NETlh2MHdFM2pL U0twcDdOREcxb1hVWEwrMitTRjk5S2p5NzUzQWJRU0FtCkg2MTdmeUJOd2hKV3ZRWWcrbVV2 UHBpR090c2VzOUVYVUkzbFM0djBNRWFQRzQzZmxFczFVUisxcnBGUVdWSG8KMXkxT08rc0FF UUVBQVlrQ1BBUVlBUWdBSmdJYkRCWWhCSDQza3FuWXJQZldNN3dWaU8yWDZRNWlxbjQwQlFK ZgpKYjJ6QlFrVXJndlBBQW9KRU8yWDZRNWlxbjQwY25NUC8xN0NnVWtYVDlhSUpyaVBNOHdi Y2VZcmNsNytiZFlFCmY3OVNsd1NiYkhON1I0Q29JSkZPbE45Uy8zNHR5cEdWWXZwZ21DSkRZ RlRCeHlQTzkyaU1YRGdBNCtjV0h6dDUKVDFhWU85aHNLaGg3dkR0Sys2UHJvWkdjKzA4Z1VU WEhoYjk3aE1NUWhrbkpsbmZqcFNFQzllbTkwNkZVK0k5MwpUMWZUR3VwbkJhM2FXY0s4ak0w SmFCR2J5MmhHMVMzb2xhRExTVHRCSU5OQlltdnVXUjlNS09oaHFEcmxrNWN3CkZESkxoNU5y WHRlRVkwOFdBemNMekczcGtyWFBIa0ZlTVF0ZnFrMGpMZEdHdkdDM05DSWtxWXJkTGhpUnZH cHIKdTM4QzI2UkVuNWY0STB2R0UzVmZJWEhlOFRNQ05tUXV0MU50TXVVbXBESXkxYUx4R3p1 cHRVaG5PSk4vL3IrVgpqRFBvaTNMT3lTTllwaHFlL2RNdWJzZlVyNm9oUDQxbUtGODFGdXdJ NGFtcUp0cnFJTDJ5cWF4M2EwcWxmd0N4ClhmdGllcUpjdWVrWCtlQ1BEQ0tyWU1YUjBGWWd3 cEcySVRaVUd0ckVqRVNsRTZEc2N4NzM0SEtkcjVPUklvY0wKVVVLRU9HZWlVNkRHaEdGZGI1 VHd1MFNuK3UxbVVQRE4wTSsrQ2RNdkNsSUU4a2xvNEc5MUVPSW11MVVwYjh4YwpPUFF3eGgx andxU3JVNVF3b05tU1llZ1FTSExwSVV1ckZ6MWlRVWgxdnBQWHpLaW5rV0VxdjRJcUExY2lM K0x5CnlTdUxrcDdNc0pwVlJNYldKQ05XT09TYmFING9EQko1ZEhNR2MzNXg1bW9zQ2s5MFBY a251RkREc1lIZkRvNXMKbWY5bG82WVh4N045Cj0zTGFJCi0tLS0tRU5EIFBHUCBQVUJMSUMg S0VZIEJMT0NLLS0tLS0K Organization: UCLA Computer Science Department Message-ID: <6ffc586f-8f30-61d2-7d61-947b0209ae64@cs.ucla.edu> Date: Tue, 22 Sep 2020 11:00:15 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <87ef5wzyx3.5.fsf@jidanni.org> Content-Type: multipart/mixed; boundary="------------A1483B18C3FB413121D7F866" Content-Language: en-US X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 35339-done Cc: 35339-done@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -3.3 (---) This is a multi-part message in MIME format. --------------A1483B18C3FB413121D7F866 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 4/20/19 4:41 AM, =E7=A9=8D=E4=B8=B9=E5=B0=BC Dan Jacobson wrote: > =E2=80=98--line-buffered=E2=80=99 > Use line buffering on output. This can cause a performance > penalty. >=20 > OK, but say what will happen if one doesn't use this. Paragraph > buffering? Page buffering? Thanks for mentioning this. I installed the attached patch to try to clar= ify=20 this point. --------------A1483B18C3FB413121D7F866 Content-Type: text/x-patch; charset=UTF-8; name="0001-doc-improve-line-buffer-doc.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="0001-doc-improve-line-buffer-doc.patch" >From 2508eb94fbd01c73f78f742b61953fdf938acf4b Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Tue, 22 Sep 2020 10:56:29 -0700 Subject: [PATCH] doc: improve --line-buffer doc * doc/grep.texi (Other Options): Document --line-buffered more carefully, and say what happens when it is not used. Problem reported by Dan Jacobson (Bug#35339). --- doc/grep.texi | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/doc/grep.texi b/doc/grep.texi index 15185f3..bb76ae1 100644 --- a/doc/grep.texi +++ b/doc/grep.texi @@ -771,8 +771,11 @@ and @file{file2}. @item --line-buffered @opindex --line-buffered @cindex line buffering -Use line buffering on output. -This can cause a performance penalty. +Use line buffering for standard output, regardless of output device. +By default, standard output is line buffered for interactive devices, +and is fully buffered otherwise. With full buffering, the output +buffer is flushed when full; with line buffering, the buffer is also +flushed after every output line. The buffer size is system dependent. @item -U @itemx --binary -- 2.17.1 --------------A1483B18C3FB413121D7F866-- From unknown Fri Aug 15 18:06:18 2025 Received: (at fakecontrol) by fakecontrolmessage; To: internal_control@debbugs.gnu.org From: Debbugs Internal Request Subject: Internal Control Message-Id: bug archived. Date: Wed, 21 Oct 2020 11:24:05 +0000 User-Agent: Fakemail v42.6.9 # This is a fake control message. # # The action: # bug archived. thanks # This fakemail brought to you by your local debbugs # administrator