From owner-freebsd-questions@FreeBSD.ORG Thu May 16 16:06:52 2013 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 928F7E87 for ; Thu, 16 May 2013 16:06:52 +0000 (UTC) (envelope-from Devin.Teske@fisglobal.com) Received: from mx1.fisglobal.com (mx1.fisglobal.com [199.200.24.190]) by mx1.freebsd.org (Postfix) with ESMTP id 6369FAF for ; Thu, 16 May 2013 16:06:51 +0000 (UTC) Received: from smtp.fisglobal.com ([10.132.206.16]) by ltcfislmsgpa03.fnfis.com (8.14.5/8.14.5) with ESMTP id r4GG6p4T010067 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); Thu, 16 May 2013 11:06:51 -0500 Received: from LTCFISWMSGMB26.FNFIS.com ([10.132.99.18]) by LTCFISWMSGHT05.FNFIS.com ([10.132.206.16]) with mapi id 14.02.0309.002; Thu, 16 May 2013 11:06:50 -0500 From: "Teske, Devin" To: Tim Daneliuk Subject: Re: check variable content size in sh script Thread-Topic: check variable content size in sh script Thread-Index: AQHOUkc8OBFwBehJxk+zMS+kIvSMRZkIQzQAgAAKzgA= Date: Thu, 16 May 2013 16:06:50 +0000 Message-ID: <13CA24D6AB415D428143D44749F57D7201F4D41F@ltcfiswmsgmb26> References: <5194F65F.6080503@a1poweruser.com> <5194FB0A.9090400@tundraware.com> In-Reply-To: <5194FB0A.9090400@tundraware.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.132.253.126] Content-Type: text/plain; charset="Windows-1252" Content-ID: <9F0C3520CA0AD943A76AC6C994D3318E@fisglobal.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.10.8626, 1.0.431, 0.0.0000 definitions=2013-05-16_04:2013-05-16,2013-05-16,1970-01-01 signatures=0 Cc: "" X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list Reply-To: Devin Teske List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 May 2013 16:06:52 -0000 On May 16, 2013, at 8:28 AM, Tim Daneliuk wrote: > On 05/16/2013 10:08 AM, Joe wrote: >> Hello >>=20 >> Have script that has max size on content in a variable. >> How to code size less than 51 characters? >>=20 >=20 > FOO=3D"Some string you want to check length of" > FOOLEN=3D`echo $FOO | wc | awk '{print $3}'` >=20 Uh, without forking to 2 separate programs=85 FOOLEN=3D${#FOO} > You can then use $FOOLEN in a conditional. >=20 However, if the OP wanted to actually truncate $FOO to 51 characters: NEWFOO=3D$( echo "$FOO" | awk -v max=3D51 '{print substr($0,0,max)}' ) However, if you want to handle the case of $FOO containing newlines (and yo= u want the newline to count toward the max), then this instead would do the= trick: NEWFOO=3D$( echo "$FOO" | awk -v max=3D51 ' { len =3D length($0) max -=3D len print substr($0,0,(max > 0 ? len : max + len)) if ( max < 0 ) exit max-- }' ) $NEWFOO, even if multi-line, will be limited to 51-bytes (adjust max=3D51 a= ccordingly for other desired-lengths). Newlines are preserved. Last, but not least, if you want to be able to handle multi-line values but= only want to return the first line up-to N bytes (using 51 as the OP used): NEWFOO=3D$( echo "$FOO" | awk -v max=3D51 '{ print substr($0,0,max); exit }= ' ) If $FOO had multiple lines, $NEWFOO will have only the first line (and it w= ill be truncated to 51 bytes or less). --=20 Devin _____________ The information contained in this message is proprietary and/or confidentia= l. If you are not the intended recipient, please: (i) delete the message an= d all copies; (ii) do not disclose, distribute or use the message in any ma= nner; and (iii) notify the sender immediately. In addition, please be aware= that any message addressed to our domain is subject to archiving and revie= w by persons other than the intended recipient. Thank you.