I want to know how to merge files with same names

For example I have following files in one folder:


And I want to merge first two into one output file and last two into another output file.

  • "merge" in what sense, exactly? do you want to concatenate the files, or interleave their lines, or paste them side-by-side, or something else? – steeldriver Jan 25 '16 at 23:17
for file in `ls`|cut -d"-" -f1
  cat ${file}-* > ${file}

this will cat the files with the same name prefix and send the output to the file with the same prefix, assuming you do not have any other stray files in the same directory you are in


Not knowing what you want the output to look like, it's a little difficult, but there's two steps as far as I can see it. Step one: picking the files, and step two: merging them. This is how I'd do step one.

# loop through your one_ files
for file1 in *-NA.one_.txt; do
    # get your second_ files
    # cat them together
    cat $file1 $file2 > cat.$file1
    # or paste
    paste $file1 $file2
  • @don_crissti mostly because, "That's how I know how." It may be ugly, but it is also direct and transparent and won't catch any accidental files (perhaps "*-NA.three_.txt"). – 22degrees Jan 25 '16 at 23:32
  • No, that's really good. I didn't know that syntax existed. Thanks. – 22degrees Jan 25 '16 at 23:57
  • WOW! It looks like I am gonna use echo | sed a lot less frequently... Thanks again. – 22degrees Jan 26 '16 at 0:02

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