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Concatenating text files means placing their contents one after another in a chosen order. On Unix-like systems, cat file1.txt file2.txt > combined.txt sends the contents of the two input files, in command-line order, to a new output file. It does not automatically insert a separator between them.
How does concatenating text files work?
Concatenation is a sequential operation: the contents of one file are followed by the contents of the next. The GNU Coreutils 9.11 documentation defines cat as copying files—or standard input—to standard output. POSIX likewise specifies that cat reads files in sequence and writes their contents to standard output in that same sequence; its cat utility specification gives cat doc1 doc2 > doc.all as an example.
How do you combine files into one?
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Open a Unix-like shell, such as a terminal on a Unix-like system.
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List the input files in the order you want their contents to appear, then redirect the output to a destination file:
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cat file1.txt file2.txt > combined.txt
The shell operator > sends the command’s standard output to combined.txt. Put the desired first file before the second: the order of the operands determines the order of the combined contents.
Does concatenation add a newline or separator?
No. Concatenation copies contents as they are; it does not promise to add a newline, blank line, comma, or other delimiter between files. If one file does not end with a newline, its last text may run directly into the next file’s first text. Add an explicit separator when file boundaries need to remain visible.
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When is concatenation not the right kind of merge?
Use concatenation when the goal is to place complete file contents end to end. It does not match records, align lines side by side, or interpret a CSV or other structured format. For example, POSIX join matches records using a common field, while cat simply streams contents in sequence. A task that requires matching rows by an identifier needs a record-aware operation, not plain concatenation.
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