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Top Forums UNIX for Dummies Questions & Answers Basic help Post 302952972 by bakunin on Monday 24th of August 2015 04:13:38 PM
Old 08-24-2015
Most has already been said, but:

`command` and $(command) does basically the same. It executes "command" and uses the output of this command to complete the command line. "command" could either be a single command or even a series of commands, a pipeline, etc..

Example:

Code:
command1 $(command2)

will first execute "command2", then put its output onto the commandline and execute the resulting line. Suppose the output to be "hello world" the shell would try to execute

Code:
command1 "hello world"

after completing "command2". The mechanism is called "process substitution".

The first variant is deprecated, has a lot of shortcomings and should be avoided. Use the second variant instead whenever possible.

Only very old shells (the original Bourne shell for instance) support the first variant(called "backticks") only. Modern shells (ksh, ksh93, bash, ...) support both variants but the former only for backwards compatibility.

I hope this helps.

bakunin
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bdiff(1)						      General Commands Manual							  bdiff(1)

Name
       bdiff - big file differential comparator

Syntax
       bdiff file1 file2 [n] [-s]

Description
       The  command  is  used to find lines that must be changed in two files to bring them into agreement.  Its purpose is to allow processing of
       files that are too large for

       The command ignores lines common to the beginning of both files, splits the remainder of each file into n-line segments, and  invokes  upon
       corresponding  segments.   The  value of n is 3500 by default.  If the optional third argument is given and if it is numeric, it is used as
       the value for n.  This is useful in those cases in which 3500-line segments are too large for causing it to fail.

       The output of the command is the same as the output of the command: line numbers are adjusted to account for the segmenting of the files to
       make  it  look  as  if the files had been processed whole.  Note that because of the segmenting of the files, does not necessarily find the
       smallest sufficient set of file differences.

       If either file1 or file2 is -, the standard input is read.  The optional -s (silent) argument specifies	that  no  diagnostics  are  to	be
       printed by However, this does not suppress possible exclamations by If both optional arguments are specified, they must appear in the order
       indicated above.

Options
       -s		   Suppresses normal diagnostic messages.

Diagnostics
       Use for explanations.

Files
       /tmp/bd?????

See Also
       diff(1)

																	  bdiff(1)
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