Prepend data from one file to another
The following command will take the two files and merge them into one
cat file1.txt file2.txt > file3.txt; mv file3.txt file2.txt
Append data from one file to another windows command line
not sure what your end goal really is, but this is the best I can think of without using a for loop and batch file.
If you want the result on one line
set /p one=<file1.txt & set /p two=<file2.txt & echo %one% '%two%'>File1.txt
If you want the result on separate lines
set /p two=<file2.txt & echo '%two%'>>file1.txt
Append a file in the middle of another file in bash
Could you please try following and let me know if this helps you.
awk 'FNR==3{system("cat file2.txt")} 1' file1.txt
Output will be as follows.
I
am
a
black
dog
named
Cookie
Explanation: Checking here if line number is 3 while reading Input_file named file1.txt, if yes then using system utility of awk which will help us to call shell's commands, then I am printing the file2.txt with use of cat command. Then mentioning 1 will be printing all the lines from file1.txt. Thus we could concatenate lines from file2.txt into file1.txt.
How to append contents of multiple files into one file
You need the cat
(short for concatenate) command, with shell redirection (>
) into your output file
cat 1.txt 2.txt 3.txt > 0.txt
Append data from 1 file to another using AWK
All from
file2
and just ignorefile1
input, but I have to have the file1 name in awk command.
If you must use file1
and file2
in arguments to awk command and want to output content from file2
only then you can just use:
awk 'BEGIN {delete ARGV[1]} 1' file1 file2 > file3
123
ABC
XYZ
456
delete ARGV[1]
will delete first argument from argument list.
How to append data at a particular line in a file using sed , where data is from another file
Why not have sed
write its own script?
sed -e "$(sed -e 's|^\(.*\)_data_to_be_appended=\(.*\)|/^\1=.*/ s//\& \2/|' cfg)" script
Inner command reads the config file and emits /^flag=.*/ s//& xyz/
which is then applied to the script file.
Output:
./file.config
flag=abc xyz
echo $flag
The two escaped parenthesis pairs capture key and value as \1
and \2
.
In s//& \2/
the //
is the null regex which matches the last
regex used (in /^…/
) and replaces the entire match (&
) followed
by the captured value.
C#: Appending *contents* of one text file to another text file
No, I don't think there's anything which does this.
If the two files use the same encoding and you don't need to verify that they're valid, you can treat them as binary files, e.g.
using (Stream input = File.OpenRead("file1.txt"))
using (Stream output = new FileStream("file2.txt", FileMode.Append,
FileAccess.Write, FileShare.None))
{
input.CopyTo(output); // Using .NET 4
}
File.Delete("file1.txt");
Note that if file1.txt
contains a byte order mark, you should skip past this first to avoid having it in the middle of file2.txt
.
If you're not using .NET 4 you can write your own equivalent of Stream.CopyTo
... even with an extension method to make the hand-over seamless:
public static class StreamExtensions
{
public static void CopyTo(this Stream input, Stream output)
{
if (input == null)
{
throw new ArgumentNullException("input");
}
if (output == null)
{
throw new ArgumentNullException("output");
}
byte[] buffer = new byte[8192];
int bytesRead;
while ((bytesRead = input.Read(buffer, 0, buffer.Length)) > 0)
{
output.Write(buffer, 0, bytesRead);
}
}
}
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