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Top Forums UNIX for Beginners Questions & Answers How to append two fasta files? Post 303036022 by RudiC on Wednesday 12th of June 2019 06:10:31 PM
Old 06-12-2019
May I paraphrase your request: You want file2's sequences to prevail and file1's sequences inserted only if there's no equivalent in file2. If so, try
Code:
tr $'\n>' $' \n' <file1|  grep -vf <(sed -n 's/>//p' file2) | cat  <(tr $'\n>' $' \n' <file2) - |  tr  -s $' \n' $'\n>'
>Contig_1:90600-91187
GACCGTCATCAATTCCTGTTCCTTGCCCTTGACGACCTCATCCACGTCCTTGATGGCCTT
>Contig_24:26615-28387
TTCGCCGCGCTCCAAACGGGCGATCTCCTCGGCGCGGGCCGCCAGGATCAGCGCCG
>Contig_98:35323-35886
GACGAAGCGCTCGCCAAGGCCGAAGAAGAAGGCCTGGATCTGGTCGAAATCCAGCCGCAG
>

with any length fasta sequences. The traiing ">" can be taken care of piping through | sed '$d' if need be. Please be aware that your desired output's "Contig_98" line is missing an "AG" at the end.

Last edited by RudiC; 06-13-2019 at 05:00 AM..
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merge(1)						      General Commands Manual							  merge(1)

NAME
merge - three-way file merge SYNOPSIS
file1 file2 file3 DESCRIPTION
combines two files that are revisions of a single original file. The original file is file2, and the revised files are file1 and file3. identifies all changes that lead from file2 to file3 and from file2 to file1, then deposits the merged text into file1. If the option is used, the result goes to standard output instead of file1. An overlap occurs if both file1 and file3 have changes in the same place. prints how many overlaps occurred, and includes both alterna- tives in the result. The alternatives are delimited as follows: lines in file1 lines in file3 If there are overlaps, edit the result in file1 and delete one of the alternatives. This command is particularly useful for revision control, especially if file1 and file3 are the ends of two branches that have file2 as a common ancestor. EXAMPLES
A typical use for is as follows: 1. To merge an RCS branch into the trunk, first check out the three different versions from RCS (see co(1)) and rename them for their revision numbers: 5.2, 5.11, and 5.2.3.3. File 5.2.3.3 is the end of an RCS branch that split off the trunk at file 5.2. 2. For this example, assume file 5.11 is the latest version on the trunk, and is also a revision of the "original" file, 5.2. Merge the branch into the trunk with the command: 3. File 5.11 now contains all changes made on the branch and the trunk, and has markings in the file to show all overlapping changes. 4. Edit file 5.11 to correct the overlaps, then use the command to check the file back in (see ci(1)). WARNINGS
uses the ed(1) system editor. Therefore, the file size limits of ed(1) apply to AUTHOR
was developed by Walter F. Tichy. SEE ALSO
diff3(1), diff(1), rcsmerge(1), co(1). merge(1)
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