From owner-freebsd-questions@freebsd.org Wed Feb 20 19:16:12 2019 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 3B49614FD2C5 for ; Wed, 20 Feb 2019 19:16:12 +0000 (UTC) (envelope-from alexmiroslav@gmail.com) Received: from mail-wr1-x42e.google.com (mail-wr1-x42e.google.com [IPv6:2a00:1450:4864:20::42e]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4A0238F364 for ; Wed, 20 Feb 2019 19:16:11 +0000 (UTC) (envelope-from alexmiroslav@gmail.com) Received: by mail-wr1-x42e.google.com with SMTP id v13so27315857wrw.5 for ; Wed, 20 Feb 2019 11:16:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=qNWcj8bHhrtTQgr3A78BtlA661XmymaRPGErA3TOCkg=; b=X/gkgb+dF3UOyJFEjiuWQgfhBUGXc7ai45FgERY/h1xnHra3/U5Gxc3f0tAAisjPaD qbX1eaO644hwfMhwYxz4xoBKGjBagrBOqfnv5IVB7r1AfuBHTnxIIZs2LbUCFwseWL9v rdTp7H/+iMKaENxUlKhFo9xS8J77nZOJxkIoNzCbpPdLe06EMCjFbc/0b6LyhQD7VYKA ij3/Pww0fNZYvIvqhxBcdJoHYatbHExBmBnjaeQ4aei8UuTGqwnFOIRx1VzSzP6B9A2I DwOQ/VMU7b3WaHlTJKkLRBr5hluOdnYKLiq+ysaswAinIk+rKDXCb15/HuVoE7OoJ4Do o5aQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=qNWcj8bHhrtTQgr3A78BtlA661XmymaRPGErA3TOCkg=; b=XmXfzYm9xjVc9eRXc7SyYuOx4iubLQWqQWgGizEuVxBi77yqPbU1SCFjNf2XvtJHKH r1fGRl7zasZocLEkANgXdKP061KxOVaCzQZ8EMBAoF0lKlgLew1UFkC7DoB6bWyxbOnl 7svX+G6HrPbM7QfVZseS3Dxglkp1iXAswI2EnLBzRaLVp+tj71Exb2kI89QSSMnYLDSz a3KiT86kcI1RdAgnHNqpt7Xe9wNy/fXaXNganFNKvqHwv6FDx8oMGiIgqWAZltWVY2pr 22cztpm5E+lJhBLxm3LLyn0N57wgby+IY83KQbjx0Dl4OduXsyQPoHoB389C4/bPmqJ9 YVJw== X-Gm-Message-State: AHQUAuY/XI0kLewlB6Ra4xSxqpotyDeFlDqWbbPYyE0aj4VaMwhXlBEX reAkTK3rqQGKPMkBQFBlpBLSWvGLOBlqni1dCMK0zA== X-Google-Smtp-Source: AHgI3Iar9xJSIKcApnzSB1J+IXzJJrw81V3oLvIqC0ixTW9WTUnsG4RWhduTP46KklpkC2lZBBiippos+MhG1+n/2PI= X-Received: by 2002:adf:eb48:: with SMTP id u8mr25289422wrn.198.1550690169826; Wed, 20 Feb 2019 11:16:09 -0800 (PST) MIME-Version: 1.0 From: Aleksandr Miroslav Date: Wed, 20 Feb 2019 11:15:58 -0800 Message-ID: Subject: silly (non-bsd) split/cat question To: freebsd-questions@freebsd.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 4A0238F364 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=X/gkgb+d; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of alexmiroslav@gmail.com designates 2a00:1450:4864:20::42e as permitted sender) smtp.mailfrom=alexmiroslav@gmail.com X-Spamd-Result: default: False [-6.52 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; FREEMAIL_FROM(0.00)[gmail.com]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-questions@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; RCVD_TLS_LAST(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; MX_GOOD(-0.01)[cached: alt3.gmail-smtp-in.l.google.com]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[e.2.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; IP_SCORE(-2.69)[ip: (-9.14), ipnet: 2a00:1450::/32(-2.26), asn: 15169(-1.99), country: US(-0.07)]; NEURAL_HAM_SHORT(-0.82)[-0.818,0]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; RCVD_COUNT_TWO(0.00)[2]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0] X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Feb 2019 19:16:12 -0000 Suppose I have 6 files that have been created by split, they are roughly 2GiB each. The last one is a little smaller. In total, they take up about 12GiB of space. Normally I would "cat x* > bigfile; rm x*" to get the bigfile back. But on this particular box, I only have 9GiB remaining space, so when bigfile is reconstituted, but before x* are deleted, I would run out of disk space. So I do something like this to reconstitute bigfile: "for i in x*; do cat $i >> bigfile; rm $i; done" That works because I delete each component file as I am recreating bigfile without going over the free space on my disk. If I want to go in the opposite direction and split bigfile into files of about 2GiB each, I do this: "split -b 2g bigfile; rm bigfile", but that uses up 12GiB of space before the rm happens. So my question is this: if I have bigfile, which is about 12GiB in size, and I have 9GiB left of free disk space, how do I split bigfile into files of about 2GiB?