Inserting a file into another file after the 1st occurrence of a pattern

sedtext processing

I want to insert the contents of file1 into file2 after a matching PATTERN. I want to do it only after the first occurrence of the PATTERN.

I would like to know the modification I need to make to the following command for my needs.

sed -i "/PATTERN/r file1" file2

Best Answer

sed '/PATTERN/{
       r file1
       :a
       n
       ba
     }' file2

:a, n, ba is just a cycle that printouts the whole file content after the PATTERN till the end. and note, that those 6 lines are just one command, but newline is needed to delimit the next sed command after r, : and b.

additional info from info sed :

`n'
     If auto-print is not disabled, print the pattern space, then,
     regardless, replace the pattern space with the next line of input.
     If there is no more input then `sed' exits without processing any
     more commands.

`: LABEL'
     [No addresses allowed.]

     Specify the location of LABEL for branch commands.  In all other
     respects, a no-op.

`b LABEL'
     Unconditionally branch to LABEL.  The LABEL may be omitted, in
     which case the next cycle is started.

Related Solutions

Insert Text from File Inline After Matching Pattern – Sed and Awk Tips

In your linked question there is already good awk answer, just modify it a little bit by using printf instead of print to insert the content without newline:

awk '/First/ { printf $0; getline < "File1.txt" }1' infile.txt

Result:

Some Text here
FirstThis is text to be inserted into the File.
Second
Some Text here

You may want to add space or other delimeter after "First" with printf $0 " "; ...

If inserted file has many lines then:

awk '/First/{printf $0; while(getline line<"File1.txt"){print line};next}1' infile.txt

Result:

Some Text here
First[
    {
        "foo": "bar", 
        "baz": "biff",
        "data": [
            {
                "a": 1945619, 
                "b": [
                    {
                        "c": 512665, 
                        "d": "futz"
                    }
                ]
            }
        ]
    }
]
Second
Some Text here

Cat file1 into file2 after specific pattern match

With sed:

sed -e '/22/r file1' file2

Best Answer

Related Solutions

Insert Text from File Inline After Matching Pattern – Sed and Awk Tips

Cat file1 into file2 after specific pattern match

Related Question