Just the other day, I was needing to generate checksums of files and compare them through a shell script; useful when you want to know when a file has been changed without comparing what has been changed.
On Linux, it’s pretty simple (md5sum), however, on Solaris, it’s a totally different set of commands – and on top of that – Solaris 9 and 10 are totally different. First thing though, my disclaimer is, I’m using stock Solaris 9 and 10 machines and I am well aware that I could install md5sum and/or the Solaris 10 equivalent onto the Solaris 9 machine, however I assume that you cannot just install software without proper change management schedules.
Solaris 9
## Full Format [root@server:~]# cksum /dev/null 4294967295 0 /dev/null ## Only display the checksum [root@server:~]# cksum /dev/null | cut -f1 4294967295 |
Solaris 10
cksum
## Full Format [root@server:~]# cksum /dev/null 4294967295 0 /dev/null ## Only display the checksum [root@server:~]# cksum /dev/null | cut -f1 4294967295 |
digest
## Full Format - MD5 [root@server:~]# digest -v -a md5 /dev/null md5 (/dev/null) = d41d8cd98f00b204e9800998ecf8427e ## Full Format - SHA1 [root@server:~]# digest -v -a sha1 /dev/null sha1 (/dev/null) = da39a3ee5e6b4b0d3255bfef95601890afd80709 ## Full Format - SHA256 [root@server:~]# digest -v -a sha256 /dev/null sha256 (/dev/null) = e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 ## Full Format - SHA512 [root@server:~]# digest -v -a sha512 /dev/null sha512 (/dev/null) = cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e ## Only display the checksum - MD5 [root@server:~]# digest -a md5 /dev/null d41d8cd98f00b204e9800998ecf8427e ## Only display the checksum - SHA1 [root@server:~]# digest -a sha1 /dev/null da39a3ee5e6b4b0d3255bfef95601890afd80709 ## Only display the checksum - SHA256 [root@server:~]# digest -a sha256 /dev/null e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855 ## Only display the checksum - SHA512 [root@server:~]# digest -a sha512 /dev/null cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e |
For comparing files, I usually just use mksum or MD5 algorithm.