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script to add first line from another file in aix

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# 1  
Old 03-04-2008
PHP script to add first line from another file in aix
Hi All,

I want to add a header from one file to another file which is around 2GB in size currently i am using cat to do it. It took more time to process. Is there any way to do it? Please help me ..

Thanks in Advance

Selva S
# 2  
Old 03-04-2008
Hi selva,

I hope the below will work for you,

head -1 input_file > output_file
# 3  
Old 03-04-2008
Quote:
Originally Posted by apsprabhu
Hi selva,

I hope the below will work for you,

head -1 input_file > output_file

It will replace my original file Smilie
If i used >> instead of > it will also append


I want to write first line of old file from a text file.

I am using below one at present

cat singlelinefile > newfile
cat millionlinefile >>newfile
mv millionlinefile millionlinefile.old
mv newfile millionlinefile
# 4  
Old 03-04-2008
Hi,

i assume you want to take the hearder fom file1 and append it as header of file2. then below script will work for you,

head -1 file1> temp_file
cat temp_file file2 >output_file

Now the header of file1 and contents of file2 are written into new file called "output_file".

If you want to move the new output_file to old name itself means,
mv output_file >file2 (old_file)
# 5  
Old 03-04-2008
Code:
# sed script to insert "header.txt" above the first line
1{h; r header.txt
  D; }
2{x; G; }
#---end of sed script---

Code:
cat header.txt
HEADER

Code:
cat file1
INSERT HERE
jkqfqjkdf
qsdjfhqskfh
qjsdhfqsjkf
qjsdhflqjf

Code:
sed -f script file > file2
cat file2
HEADER
INSERT HERE
jkqfqjkdf
qsdjfhqskfh
qjsdhfqsjkf
qjsdhflqjf

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