how to merge/append one file content to another file using shell script

Question

I have two file fileA and fileB

FileA content

PersonName Value1 Value2 Value3

FileB content

ALBERT check1 check1 check1
ALBERT check2 check2 check2
ALBERT check3 check3 check3

I want to merge content of fileA and fileB and FileA content should be the first line in the merged file

I tried using paste and sort command... not not able to get required result any suggestions...

score 12 · Accepted Answer · answered Jan 03 '14 at 15:15

12

cat FileA FileB > NewFile

or

cat FileA > NewFile
cat FileB >> NewFile

answered Jan 03 '14 at 15:15

TypeIA

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Yes, this is a useful use of cat – glenn jackman Jan 03 '14 at 15:57
wondering why this ever was is the up voted answer? The question was append one file to another, not create a new file. The newer answer above using tee is correct for the question. – DKebler Apr 20 '23 at 14:21

score 7 · Answer 2 · edited Jan 03 '14 at 15:58

7

In Unix/Linux you can use the command cat

Example:

cat file1.txt file2.txt > file3.txt

This will put the contents of file1 and file2 into file3.

cat file1.txt >> file2.txt

This will add the information from file1.txt to the information already existing in file2.txt

edited Jan 03 '14 at 15:58

glenn jackman

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answered Jan 03 '14 at 15:22

user3157610

71
1

score 1 · Answer 3 · answered Jun 26 '22 at 14:12

1

cat FileA | tee -a FileB

$ cat FileA
PersonName Value1 Value2 Value3
$ cat FileB
ALBERT check1 check1 check1
ALBERT check2 check2 check2
ALBERT check3 check3 check3
$ cat FileA | tee -a FileB
ALBERT check1 check1 check1
ALBERT check2 check2 check2
ALBERT check3 check3 check3
PersonName Value1 Value2 Value3

answered Jun 26 '22 at 14:12

rok

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`cat FileA | tee -a FileB > /dev/null` add `/dev/null` to suppress the cat of FileA, tee being ...well... tee. It is possible to make a temporary file and copy over FileB instead but this is simple. – DKebler Apr 20 '23 at 14:24

how to merge/append one file content to another file using shell script

3 Answers3