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Top Forums UNIX for Dummies Questions & Answers Number of differences between 2 files Post 39836 by google on Monday 1st of September 2003 06:50:05 PM
Old 09-01-2003
Quote:
diff file1 file2|wc -l
wc -l would simply count all of the differences found in file 1 + file 2. Be sure to use either the -b or the -w flag to ignore whitespace, tabs and other characters. To get a better picture of the comparison using diff, pipe the output to grep and grep for the lines with a '<' or '>' symbol. That way, you will get lines that are different in file 1 or file 2.

If you are working with data files that can be sorted, look at using the comm command. You may also look at using cmp to do a comparison.

As always, see:

man diff
or
man cmp
or
man comm

Last edited by google; 09-01-2003 at 07:59 PM..
 

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DIFF(1) 						      General Commands Manual							   DIFF(1)

NAME
diff - print differences between two files SYNOPSIS
diff [-c | -e | -C n] [-br]file1 file2 OPTIONS
-C n Produce output that contains n lines of context -b Ignore white space when comparing -c Produce output that contains three lines of context -e Produce an ed-script to convert file1 into file2 -r Apply diff recursively to files and directories of EXAMPLES
diff file1 file2 # Print differences between 2 files diff -C 0 file1 file2 # Same as above diff -C 3 file1 file2 # Output three lines of context with every diff -c file1 file2 # Same diff /etc /dev # Compares recursively the directories /etc and /dev diff passwd /etc # Compares ./passwd to /etc/passwd DESCRIPTION
the same name, when file1 and file2 are both directories" difference encountered" Diff compares two files and generates a list of lines telling how the two files differ. Lines may not be longer than 128 characters. If the two arguments on the command line are both directories, diff recursively steps through all subdirectories comparing files of the same name. If a file name is found only in one directory, a diagnostic message is written to stdout. A file that is of either block special, character special or FIFO special type, cannot be compared to any other file. On the other hand, if there is one directory and one file given on the command line, diff tries to compare the file with the same name as file in the directory directory. SEE ALSO
cdiff(1), cmp(1), comm(1), patch(1). DIFF(1)
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