##获取文件大小

wc -c "tooopen_17270713.jpg" | awk '{print $1}'

##获取checksum

• Calculate MD5 checksum:

md5 /tmp/1.iso

• Calculate SHA-1 checksum:

shasum -a 1 /tmp/1.iso

• Calculate SHA-256 checksum:

shasum -a 256 /tmp/1.iso

##doc

• Mac OS X: how to generate md5 sha1 sha256 checksums from command line

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