Concatenating Files And Insert New Line In Between Files

Question

I have multiple files which I want to concat with cat  Let s say   File1 txt  foo  File2 txt bar  File3 txt qux   I want to concat so that the final file looks like   foo  bar  qux   Instead of this with usual cat File  txt  gt  finalfile txt   foo bar  qux   What s the right way to do it

User · Answer

If you have few enough files that you can list each one  then you can use process substitution in Bash  inserting a newline between each pair of files   cat File1 txt  lt  echo  File2 txt  lt  echo  File3 txt  gt  finalfile txt

User · Answer

You may do it using xargs if you like  but the main idea is still the same   find   txt   xargs -I   sh -c  cat     echo      gt  finalfile txt

User · Answer

In python  this concatenates with blank lines between files  the   suppresses adding an extra trailing blank line    print   n  join open f  read   for f in filenames     Here is the ugly python one-liner that can be called from the shell and prints the output to a file   python -c  from sys import argv  print   n  join open f  read   for f in argv 1      File  txt  gt  finalfile txt

User · Answer

If it were me doing it I d use sed   sed -e   s    n   -s   txt  gt  finalfile txt   In this sed pattern   has two meanings  firstly it matches the last line number only  as a range of lines to apply a pattern on  and secondly it matches the end of the line in the substitution pattern   If your version of sed doesn t have -s  process input files separately  you can do it all as a loop though   for f in   txt   do sed -e   s    n    f   done  gt  finalfile txt

User · Answer

You can do   for f in   txt  do  cat    f    echo   gt  gt  finalfile txt  done   Make sure the file finalfile txt does not exist before you run the above command   If you are allowed to use awk you can do   awk  FNR  1 print    1    txt  gt  finalfile txt

User · Answer

That s how I just did it on OsX 10 10 3  for f in   txt  do  cat  f  echo      gt  gt  fullData txt  done   since the simple  echo  command with no params ended up in no new lines inserted

User · Answer

This works in Bash   for f in   txt  do cat  f  echo  done   In contrast to answers with  gt  gt   append   the output of this command can be piped into other programs   Examples    for f in File  txt  do cat  f  echo  done  gt  finalfile txt  for     done   gt  finalfile txt  parens are optional  for     done   less  piping into less  for     done   head -n -1  this strips off the trailing blank line

[linux] Concatenating Files And Insert New Line In Between Files

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