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Full Discussion: Compare two files
Top Forums UNIX for Dummies Questions & Answers Compare two files Post 5475 by b5fnpct on Wednesday 15th of August 2001 10:27:46 AM
Old 08-15-2001
Computer Compare two files

Hi,

There are two files with some lines are exactly the same, some lines are not. I want to compare these two files and create a third file contains both the first and second file's lines without duplicate line. Which command should I use? If I write a shell script, what is the syntax to "open" a file instead of using "cat"?

Thanks in advance!

 

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UNIQ(1) 							   User Commands							   UNIQ(1)

NAME
uniq - report or omit repeated lines SYNOPSIS
uniq [OPTION]... [INPUT [OUTPUT]] DESCRIPTION
Filter adjacent matching lines from INPUT (or standard input), writing to OUTPUT (or standard output). With no options, matching lines are merged to the first occurrence. Mandatory arguments to long options are mandatory for short options too. -c, --count prefix lines by the number of occurrences -d, --repeated only print duplicate lines -D, --all-repeated[=delimit-method] print all duplicate lines delimit-method={none(default),prepend,separate} Delimiting is done with blank lines -f, --skip-fields=N avoid comparing the first N fields -i, --ignore-case ignore differences in case when comparing -s, --skip-chars=N avoid comparing the first N characters -u, --unique only print unique lines -z, --zero-terminated end lines with 0 byte, not newline -w, --check-chars=N compare no more than N characters in lines --help display this help and exit --version output version information and exit A field is a run of blanks (usually spaces and/or TABs), then non-blank characters. Fields are skipped before chars. Note: 'uniq' does not detect repeated lines unless they are adjacent. You may want to sort the input first, or use `sort -u' without `uniq'. Also, comparisons honor the rules specified by `LC_COLLATE'. AUTHOR
Written by Richard M. Stallman and David MacKenzie. REPORTING BUGS
Report uniq bugs to bug-coreutils@gnu.org GNU coreutils home page: <http://www.gnu.org/software/coreutils/> General help using GNU software: <http://www.gnu.org/gethelp/> Report uniq translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
comm(1), join(1) The full documentation for uniq is maintained as a Texinfo manual. If the info and uniq programs are properly installed at your site, the command info coreutils 'uniq invocation' should give you access to the complete manual. GNU coreutils 8.12.197-032bb September 2011 UNIQ(1)
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