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Path hashing speeds up the C shell's search for executable files. Rather than performing a filesystem call in each path directory, one at a time, until it either finds the file or runs out of possibilities, the C shell consults an internal hash table built by scanning the path directories.
When the user gives a command, the shell searches for the command in the path specified in the PATH environmental variable and stores the location in the hash. This command can be used to search for the command given. The command is built into the shell. C shell implements this command in a different way.
Hamilton C shell and Cygwin bash on Windows 7, showing the use of recursion for factoring. The original C shell uses an ad hoc parser. This has led to complaints about its limitations. It works well enough for the kinds of things users type interactively but not very well for the more complex commands a user might take time to write in a script.
crypt is a POSIX C library function. It is typically used to compute the hash of user account passwords. The function outputs a text string which also encodes the salt (usually the first two characters are the salt itself and the rest is the hashed result), and identifies the hash algorithm used (defaulting to the "traditional" one explained below).
Windows PowerShell, a command processor based on .NET Framework. PowerShell, a command processor based on .NET; Hamilton C shell, a clone of the Unix C shell by Hamilton Laboratories; Take Command Console (4NT), a clone of CMD.EXE with added features by JP Software; Take Command, a newer incarnation of 4NT
File verification is the process of using an algorithm for verifying the integrity of a computer file, usually by checksum.This can be done by comparing two files bit-by-bit, but requires two copies of the same file, and may miss systematic corruptions which might occur to both files.
hash HAS-160: 160 bits hash HAVAL: 128 to 256 bits hash JH: 224 to 512 bits hash LSH [19] 256 to 512 bits wide-pipe Merkle–Damgård construction: MD2: 128 bits hash MD4: 128 bits hash MD5: 128 bits Merkle–Damgård construction: MD6: up to 512 bits Merkle tree NLFSR (it is also a keyed hash function) RadioGatún: arbitrary ideal mangling ...
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