Append text to file from command line without using io redirection

Question

How can we append text in a file via a one-line command without using io redirection

User · Answer

If you just want to tack something on by hand, then the sed answer will work for you. If instead the text is in file(s) (say file1.txt and file2.txt):

Using Perl:

perl -e 'open(OUT, ">>", "outfile.txt"); print OUT while (<>);' file*.txt

N.B. while the >> may look like an indication of redirection, it is just the file open mode, in this case "append".

User · Answer

If you don t mind using sed then      cat test  this is line 1   sed -i    a this is line 2 without redirection  test    cat test  this is line 1 this is line 2 without redirection   As the documentation may be a bit long to go through  some explanations      -i means an inplace transformation  so all changes will occur in the file you specify   is used to specify the last line a means append a line after    is simply used as a delimiter

User · Answer

You can use the --append feature of tee   cat file01 txt   tee --append bothFiles txt  cat file02 txt   tee --append bothFiles txt    Or shorter   cat file01 txt file02 txt   tee --append bothFiles txt    I assume the request for no redirection   gt  gt   comes from the need to use this in xargs or similar  So if that doesn t count  you can mute the output with  gt  dev null

User · Answer

You can use Vim in Ex mode   ex -sc  a BRAVO  -cx file    a append text x save and close

[linux] Append text to file from command line without using io redirection

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