Re: [問題] 為什麼TAR不能兼容舊的...
※ 引述《DomainT.bbs@ptt.cc (DomainT)》之銘言：
> 我安裝的是環境及要裝的軟體全部都是英文的，所以不會有中英文的問題。
> 目前網路上在裝那套軟體的人，也有很多遇到同樣問題。
> 而解決方式，就是把red hat 9.0的/bin/tar 和 /bin/sort
> copy到自己linux下的/bin，也就是把tar及sort換成舊版的。
你第一篇描述的似乎不清楚，這篇才明確把問題說出來。
你想知道原因嗎？很簡單啦，因為當做製作包那個 script 的人，
用到了舊式語法引起的問題。
我舉例像是 head -5 filename 是取該檔案前 5 行，這種用法
是舊有以前的用法，正確一點的方式應該是 head -n 5 filename
才對。其他像是 tail +3 也是以前的使用語法。
解決方式？很簡單根本不需要去裝舊版本程式。
export _POSIX2_VERSION=199209
這樣就可以解決了。想知道原因？
File: coreutils.info, Node: Standards conformance
2.9 Standards conformance
=========================
In a few cases, the GNU utilities' default behavior is incompatible
with the POSIX standard. To suppress these incompatibilities, define
the `POSIXLY_CORRECT' environment variable. Unless you are checking
for POSIX conformance, you probably do not need to define
`POSIXLY_CORRECT'.
Newer versions of POSIX are occasionally incompatible with older
versions. For example, older versions of POSIX required the command
`sort +1' to sort based on the second and succeeding fields in each
input line, but starting with POSIX 1003.1-2001 the same command is
required to sort the file named `+1', and you must instead use the
command `sort -k 2' to get the field-based sort.
The GNU utilities normally conform to the version of POSIX that is
standard for your system. To cause them to conform to a different
version of POSIX, define the `_POSIX2_VERSION' environment variable to
a value of the form YYYYMM specifying the year and month the standard
was adopted. Two values are currently supported for `_POSIX2_VERSION':
`199209' stands for POSIX 1003.2-1992, and `200112' stands for POSIX
1003.1-2001. For example, if you have a newer system but are running
software that assumes an older version of POSIX and uses `sort +1' or
`tail +10', you can work around any compatibility problems by setting
`_POSIX2_VERSION=199209' in your environment.
--
如果真的愛一個作業系統 怎能不害怕不再能使用它 而我們必須接受現實
於是長大了 寂寞就是沒有了機會再用它 比沒有電腦還要寂寞
而那些點亮我們生命的作業系統 就彷彿電影中發生在暹邏的愛情故事
即使短暫使用也會刻骨銘心
To all the Linux that bring us to kernel.
--
※ Origin: SayYA 資訊站 <bbs.sayya.org>
◆ From: kendlee.sayya.org
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