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本帖最后由 waker 于 2012-04-23 08:54 编辑
info sort 有详解
- `-g'
- `--general-numeric-sort'
- `--sort=general-numeric'
- Sort numerically, using the standard C function `strtod' to convert
- a prefix of each line to a double-precision floating point number.
- This allows floating point numbers to be specified in scientific
- notation, like `1.0e-34' and `10e100'. The `LC_NUMERIC' locale
- determines the decimal-point character. Do not report overflow,
- underflow, or conversion errors. Use the following collating
- sequence:
- * Lines that do not start with numbers (all considered to be
- equal).
- * NaNs ("Not a Number" values, in IEEE floating point
- arithmetic) in a consistent but machine-dependent order.
- * Minus infinity.
- * Finite numbers in ascending numeric order (with -0 and +0
- equal).
- * Plus infinity.
- Use this option only if there is no alternative; it is much slower
- than `--numeric-sort' (`-n') and it can lose information when
- converting to floating point.
- `-n'
- `--numeric-sort'
- `--sort=numeric'
- Sort numerically. The number begins each line and consists of
- optional blanks, an optional `-' sign, and zero or more digits
- possibly separated by thousands separators, optionally followed by
- a decimal-point character and zero or more digits. An empty
- number is treated as `0'. The `LC_NUMERIC' locale specifies the
- decimal-point character and thousands separator. By default a
- blank is a space or a tab, but the `LC_CTYPE' locale can change
- this.
- Comparison is exact; there is no rounding error.
- Neither a leading `+' nor exponential notation is recognized. To
- compare such strings numerically, use the `--general-numeric-sort'
- (`-g') option.
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发表于 2012-04-21 12:56
发表于 2012-04-21 20:17
