sort -t: +1 filename,找不到+1这个文件？

spider_bug

[root@localhost test]# sort -t: +1 video.txt
sort: open failed: +1: No such file or directory
我的系统是Fedora 10，是不是sort不再支持+n选项了？

备注sort的帮助：

[root@localhost test]# sort --help
Usage: sort [OPTION]... [FILE]...
Write sorted concatenation of all FILE(s) to standard output.

Mandatory arguments to long options are mandatory for short options too.
Ordering options:

  -b, --ignore-leading-blanks  ignore leading blanks
  -d, --dictionary-order      consider only blanks and alphanumeric characters
  -f, --ignore-case           fold lower case to upper case characters
  -g, --general-numeric-sort  compare according to general numerical value
  -i, --ignore-nonprinting    consider only printable characters
  -M, --month-sort            compare (unknown) < `JAN' < ... < `DEC'
  -n, --numeric-sort          compare according to string numerical value
  -R, --random-sort           sort by random hash of keys
      --random-source=FILE    get random bytes from FILE (default /dev/urandom)
      --sort=WORD             sort according to WORD:
                                general-numeric -g, month -M, numeric -n,
                                random -R
  -r, --reverse               reverse the result of comparisons

Other options:

  -c, --check, --check=diagnose-first  check for sorted input; do not sort
  -C, --check=quiet, --check=silent  like -c, but do not report first bad line
      --compress-program=PROG  compress temporaries with PROG;
                              decompress them with PROG -d
  -k, --key=POS1[,POS2]     start a key at POS1, end it at POS2 (origin 1) -
                            when no POS2 specified, end of line is used
  -m, --merge               merge already sorted files; do not sort
  -o, --output=FILE         write result to FILE instead of standard output
  -s, --stable              stabilize sort by disabling last-resort comparison
  -S, --buffer-size=SIZE    use SIZE for main memory buffer
  -t, --field-separator=SEP  use SEP instead of non-blank to blank transition
  -T, --temporary-directory=DIR  use DIR for temporaries, not $TMPDIR or /tmp;
                              multiple options specify multiple directories
  -u, --unique              with -c, check for strict ordering;
                              without -c, output only the first of an equal run
  -z, --zero-terminated     end lines with 0 byte, not newline
      --help     display this help and exit
      --version  output version information and exit

POS is F[.C][OPTS], where F is the field number and C the character position
in the field; both are origin 1.  If neither -t nor -b is in effect, characters
in a field are counted from the beginning of the preceding whitespace.  OPTS is
one or more single-letter ordering options, which override global ordering
options for that key.  If no key is given, use the entire line as the key.

SIZE may be followed by the following multiplicative suffixes:
% 1% of memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y.

With no FILE, or when FILE is -, read standard input.

*** WARNING ***
The locale specified by the environment affects sort order.
Set LC_ALL=C (by "export LC_LL=C") to get the traditional sort order that uses
native byte values.

Report bugs to <bug-coreutils@gnu.org>.

spider_bug

好像新版本的没有+n这个选项了，更换为-k了