linux按列分割cut

按列获取数据，例如ps命令中，我想获取UID这一列。使用ps | cut -c 44-47便可以。

$ ps
      PID    PPID    PGID     WINPID  TTY  UID    STIME COMMAND
     5204       1    5204       5204  con  500 11:53:47 /bin/sh
     4716    5204    4716       2724  con  500 11:54:05 /bin/ps

$ ps | cut  -c 44-47
UID
500
500
500

cut有几个常用参数，-c 指定开始字符位置， -b 指定开始字节位置， -f 指定开始分割节点位置。
cut --help

$ cut --help
Usage: cut [OPTION]... [FILE]...
Print selected parts of lines from each FILE to standard output.

  -b, --bytes=LIST        output only these bytes
  -c, --characters=LIST   output only these characters
  -d, --delimiter=DELIM   use DELIM instead of TAB for field delimiter
  -f, --fields=LIST       output only these fields
  -n                      (ignored)
  -s, --only-delimited    do not print lines not containing delimiters
      --output-delimiter=STRING  use STRING as the output delimiter
                            the default is to use the input delimiter
      --help              display this help and exit
      --version           output version information and exit

Use one, and only one of -b, -c or -f.  Each LIST is made up of one
range, or many ranges separated by commas.  Each range is one of:

  N     N'th byte, character or field, counted from 1
  N-    from N'th byte, character or field, to end of line
  N-M   from N'th to M'th (included) byte, character or field
  -M    from first to M'th (included) byte, character or field

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

Report bugs to <[e-mail]>.