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Thu, 19 Nov 2020 08:16:49 -0800 (PST) X-Google-Smtp-Source: ABdhPJwu3dUsjptZCnwiAlQ8+16ZDlMVK7nT+YR6HUVzid1JfE+8BRzqvYkdLFimjwhOgDj+B4D/6w== X-Received: by 2002:ac8:488d:: with SMTP id i13mr11627441qtq.148.1605802609162; Thu, 19 Nov 2020 08:16:49 -0800 (PST) Received: from jenna.local ([2605:a000:1223:c0a6:dd7:95d8:8cc1:a33f]) by smtp.gmail.com with ESMTPSA id x4sm198842qtm.48.2020.11.19.08.16.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 19 Nov 2020 08:16:48 -0800 (PST) To: George Michaelson , Dave Horsfall References: From: Chet Ramey Organization: ITS, Case Western Reserve University Message-ID: <6da03a38-0645-f90c-1992-bfc99a51cfc9@case.edu> Date: Thu, 19 Nov 2020 11:16:47 -0500 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.4.3 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Mirapoint-IP-Reputation: reputation=Good-1, source=Queried, refid=tid=0001.0A742F8F.5FB691BB.0009, actions=tag X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A742F21.5FB69A72.002B,ss=1,re=0.000,fgs=0, ip=0.0.0.0, so=2016-11-06 16:00:04, dmn=2011-05-27 18:58:46 X-Mirapoint-Loop-Id: 93f2d40c3a2faf4529acfac3594d97c4 X-Mirapoint-IP-Reputation: reputation=good-1, source=Fixed, refid=n/a, actions=tag X-Junkmail-Status: score=8/80, host=mpv2-2015.case.edu X-Junkmail-PrAS-Raw: score=8/80, refid=2.7.2:2020.11.19.150918:17:8.317, ip=, rules=__YOUTUBE_RCVD, DKIM_SIGNATURE, __X_GOOGLE_DKIM_SIGNATURE, __HAS_REPLYTO, __HAS_CC_HDR, __MULTIPLE_RCPTS_CC_X2, __CC_NAME, __CC_NAME_DIFF_FROM_ACC, __SUBJ_REPLY, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __SUBJ_ALPHA_END, __TO_MALFORMED_2, __MULTIPLE_RCPTS_TO_X2, __TO_NAME, __TO_NAME_DIFF_FROM_ACC, __HAS_REFERENCES, __REFERENCES, __HAS_FROM, FROM_EDU_TLD, __HAS_MSGID, __SANE_MSGID, DATE_TZ_NA, __USER_AGENT, __MOZILLA_USER_AGENT, __MIME_VERSION, __IN_REP_TO, __CT, __CT_TEXT_PLAIN, __CTE, __REPLYTO_SAMEAS_FROM_ADDY, __REPLYTO_SAMEAS_FROM_ACC, __FROM_DOMAIN_IN_ANY_CC2, __REPLYTO_SAMEAS_FROM_DOMAIN, __DKIM_ALIGNS_1, __DKIM_ALIGNS_2, __ANY_URI, __URI_MAILTO, __URI_WITH_PATH, __URI_ENDS_IN_SLASH, __URI_NO_WWW, __CP_URI_IN_BODY, __SUBJ_ALPHA_NEGATE, __URI_IN_BODY, __URI_NOT_IMG, __MAIL_CHAIN, __FORWARDED_MSG, __BODY_NO_MAILTO, __NO_HTML_TAG_RAW, [TRUNCATED], so=2010-03-03 19:42:08, dmn=2016-08-03-0138 Subject: Re: [TUHS] Where did the "~" come from X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: chet.ramey@case.edu Cc: The Eunuchs Hysterical Society Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" On 11/18/20 7:44 PM, George Michaelson wrote: > A related but different "thing" is when the cd activity became a > pushdown stack of 2 (is it more? I never bothered checking) > > somebody realised going "there and back again" was innately useful. It was definitely in ksh by 1986. It never made it into any of the Bourne shells, but POSIX adopted it because it was in ksh88. I don't know whether it was in the 1983 ksh version. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/