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Top Forums UNIX for Dummies Questions & Answers Check for difference in output of 2 commands? Post 302489824 by methyl on Friday 21st of January 2011 06:30:52 PM
Old 01-21-2011
What Operating System are you running?
What Shell are you using?

Scrutinizer has quite correctly posted code using the unix "diff" program which is common to all unix versions.
The "diff" program is a buffered context compare program and shows the context of the difference and the address within each file of the difference. It is a very useful tool for comparing files which are similar and where the data is in no particular order. The "<" ">" signs tell you which file the difference came from.
It is very useful for comparing program code. For larger files there are usually special versions of diff supplied like "bdiff".


Let's say we just want to know the differences regardless of which file they came from and with no context and in no order relative to either file. I use this technique a lot for comparing code, but it works equally well for "ls".
Code:
ls -l > /tmp/my_temp_file
ls -le >> /tmp/my_temp_file
cat my_temp_file | sort | uniq -u

(Yes I know I have used "cat". I like left-to-right flow).

If you really need a one-line solution just replace each newline with a semi-colon.
This User Gave Thanks to methyl For This Post:
 

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shell(1F)							   FMLI Commands							 shell(1F)

NAME
shell - run a command using shell SYNOPSIS
shell command [command] ... DESCRIPTION
The shell function concatenate its arguments, separating each by a space, and passes this string to the shell ($SHELL if set, otherwise /usr/bin/sh). EXAMPLES
Example 1 A sample output of shell command. Since the Form and Menu Language does not directly support background processing, the shell function can be used instead. `shell "build prog > /dev/null &"` If you want the user to continue to be able to interact with the application while the background job is running, the output of an exe- cutable run by shell in the background must be redirected: to a file if you want to save the output, or to /dev/null if you don't want to save it (or if there is no output), otherwise your application may appear to be hung until the background job finishes processing. shell can also be used to execute a command that has the same name as an FMLI built-in function. NOTES
The arguments to shell will be concatenate using spaces, which may or may not do what is expected. The variables set in local environments will not be expanded by the shell because "local" means "local to the current process." ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) SunOS 5.11 5 Jul 1990 shell(1F)
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