我如何检查OS X中的sed版本？

我知道如果sed是GNU版本，版本检查可以像做一样

$ sed --version

但是这在OS X中不起作用，我该怎么做？

---

这可能不是你正在寻找的答案，但你不能。 Mac OS X sed无法显示版本号。

二进制文件中甚至没有版本号：

$ strings $(which sed)
$FreeBSD: src/usr.bin/sed/compile.c,v 1.28 2005/08/04 10:05:11 dds Exp $
$FreeBSD: src/usr.bin/sed/main.c,v 1.36 2005/05/10 13:40:50 glebius Exp $
$FreeBSD: src/usr.bin/sed/misc.c,v 1.10 2004/08/09 15:29:41 dds Exp $
$FreeBSD: src/usr.bin/sed/process.c,v 1.39 2005/04/09 14:31:41 stefanf Exp $
@(#)PROGRAM:sed  PROJECT:text_cmds-88
malloc
%lu: %s: unexpected EOF (pending }'s)
0123456789/$
%lu: %s: command expected
%lu: %s: invalid command code %c
%lu: %s: command %c expects up to %d address(es), found %d
%lu: %s: unexpected }
%lu: %s: extra characters at the end of %c command
%lu: %s: command %c expects  followed by text
%lu: %s: extra characters after  at the end of %c command
%lu: %s: filename expected
w command
read command
branch
label
%lu: %s: empty label
%lu: %s: substitute pattern can not be delimited by newline or backslash
%lu: %s: unterminated substitute pattern
%lu: %s: extra text at the end of a transform command
%lu: %s: unterminated regular expression
%lu: %s: expected context address
realloc
%lu: %s: whitespace after %s
%lu: %s: duplicate label '%s'
%lu: %s: RE error: %s
%lu: %s:  can not be used as a string delimiter
%lu: %s: newline can not be used as a string delimiter
%lu: %s: unbalanced brackets ([])
bin/sed
Unix2003
123456789
%lu: %s: %c not defined in the RE
%lu: %s: unescaped newline inside substitute pattern
%lu: %s: unterminated substitute in regular expression
%lu: %s: more than one number or 'g' in substitute flags
%lu: %s: overflow in the 'N' substitute flag
%lu: %s: no wfile specified
%lu: %s: bad flag in substitute command: '%c'
%lu: %s: transform pattern can not be delimited by newline or backslash
%lu: %s: unterminated transform source string
%lu: %s: unterminated transform target string
%lu: %s: transform strings are not the same length
%lu: %s: undefined label '%s'
%lu: %s: unused label '%s'
Eae:f:i:ln
setlinebuf() failed
stdout
"%s"
 ..."
-i may not be used with stdin
stdin
rename()
%s: %s %s
in-place editing only
works for regular files
%s: name too long
%s/.!%ld!%s
%s: %s
usage: sed script [-Ealn] [-i extension] [file ...]
       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]
first RE may not be empty
RE error: %s
%lu: %s: %d not defined in the RE
COLUMNS
abfrtv
%03o

---

尽管text_cmds的各种版本的sed没有太多变化。

10.0.0在1998年秋季使用NetBSD sed

10.3.0使用2002年秋季的FreeBSD sed ，但保持手册页不变，添加-E扩展正则表达式和-i就地编辑。

10.4.0已经进行了一些修改以进行就地编辑，并且从2004年秋季开始将手册页更改为FreeBSD手册页。

10.5.0从2005年秋季更新为FreeBSD sed，添加-l行缓冲输出和更多改进/修复以便就地编辑。

10.6.0在手册页中增加了对compat(5)的引用。

可以使用uname -r或sw_vers -productversion检查操作系统的版本，而不是sed实用程序：

case $(sw_vers -productversion) in
10.[012].*)     echo no in-place editig, EREs, or line-buffered output;;
10.[45].*)      echo no line-buffered output;;
10.[6789].*)    echo newest version as of writing;;
10.1[01].*)     echo newest version as of writing;;
esac

（BSD实用程序没有版本化，因为它们被认为是其操作系统的一部分）

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