判断两个文件是否相同

一、md5sum

Usage: md5sum [OPTION]... [FILE]...
With no FILE, or when FILE is -, read standard input.

  -b, --binary         read in binary mode
  -c, --check          read MD5 sums from the FILEs and check them
      --tag            create a BSD-style checksum
  -t, --text           read in text mode (default)
  Note: There is no difference between binary and text mode option on GNU system.

The following four options are useful only when verifying checksums:
      --quiet          don't print OK for each successfully verified file
      --status         don't output anything, status code shows success
      --strict         exit non-zero for improperly formatted checksum lines
  -w, --warn           warn about improperly formatted checksum lines

      --help     display this help and exit
      --version  output version information and exit

The sums are computed as described in RFC 1321.  When checking, the input
should be a former output of this program.  The default mode is to print
a line with checksum, a character indicating input mode ('*' for binary,
space for text), and name for each FILE.

GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
For complete documentation, run: info coreutils 'md5sum invocation'

# 生成文件的md5sum值,通过比较两个文件的md5sum值判断两个文件是否一样
md5sum mm10.fa > mm10.fa.md5
cat mm10.fa.md5
5cd1eb06fa018a77633bc42932f20b45  mm10.fa

md5sum chromFa.tar.gz > chromFa.tar.gz.md5
cat chromFa.tar.gz.md5 
cebdcdd7c2238f13ea261e3131b10b60  chromFa.tar.gz

# 很明显，两者不一样的。

二、我也不知道这是啥命令，但是一行就够了

cmp --silent mm10.fa chromFa.tar.gz && echo 'same' || echo 'different'
different