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I somehow got into a hurry when I was writing this so I guess I didn't pick a good example. So hopefully here is a better one; say you want to donwload a FreeBSD iso file. There is a file in the same directory called CHECKSUM.MD5 that holds md5 hashes of files so you could check the integrity. Off course, as a smart guy you always check the file:
Code:
$ ftp ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/ISO-IMAGES/8.0/8.0-RELEASE-i386-disc1.iso $ ftp ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/ISO-IMAGES/8.0/CHECKSUM.MD5 $ ls 8.0-RELEASE-i386-disc1.iso CHECKSUM.MD5 md5_check.sh $ ./md5_check.sh 8.0-RELEASE-i386-disc1.iso CHECKSUM.MD5 OK: (8.0-RELEASE-i386-disc1.iso) $ Code:
$ ftp -V ftp://ftp.freebsd.org/pub/FreeBSD/releases/i386/8.0-RELEASE/src/ Trying 87.51.34.132... ftp> get CHECKSUM.MD5 ftp> mget *.a* mget sbase.aa [anpqy?]? a Prompting off for duration of mget. ^C ftp> ftp> quit $ ll total 16930 drwxrwxrwt 2 soxxx soxxx - 360 Jan 16 23:52 ./ drwxr-xr-x 21 soxxx soxxx - 512 Jan 15 15:54 ../ -rw-r--r-- 1 soxxx soxxx - 5758 Nov 21 17:07 CHECKSUM.MD5 -rwxrwxrwx 1 soxxx soxxx - 192 Jan 16 23:31 md5_hash.awk* -rw-r--r-- 1 soxxx soxxx - 75919 Nov 21 17:07 sbase.aa -rw-r--r-- 1 soxxx soxxx - 521808 Nov 21 17:07 sbin.aa -rw-r--r-- 1 soxxx soxxx - 976127 Nov 21 17:07 scddl.aa -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.aa -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ab -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ac -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ad -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ae -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.af -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ag -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ah -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ai -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.aj -rw-r--r-- 1 soxxx soxxx - 1425408 Nov 21 17:07 scontrib.ak -rw-r--r-- 1 soxxx wheel - 0 Jan 16 23:51 scontrib.al -rw-r--r-- 1 soxxx wheel - 55920 Jan 16 23:51 scontrib.am $ ./md5_hash.awk "s*" CHECKSUM.MD5 OK: (sbase.aa) OK: (sbin.aa) OK: (scddl.aa) OK: (scontrib.aa) OK: (scontrib.ab) OK: (scontrib.ac) OK: (scontrib.ad) OK: (scontrib.ae) OK: (scontrib.af) OK: (scontrib.ag) OK: (scontrib.ah) OK: (scontrib.ai) OK: (scontrib.aj) OK: (scontrib.ak) ERROR: (scontrib.al) ERROR: (scontrib.am) $
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The best way to learn UNIX is to play with it, and the harder you play, the more you learn. If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD |
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