UNIX for Dummies Questions & Answers

i need help..!!!!

i have one big text file estimate data file size 50 - 100GB with 70 Mega Rows.
on OS SUN Solaris version 8

How i can remove first line of the text file.

Please suggest me for solutions.

Thank you very much in advance

i tried to use :

$ head -1 bigfile.txt > bigfile2.txt
$

But line 1 of bigfile.txt don't removed from bigfile.txt. It's just copy first line from bigfile.txt to bigfile2.txt Only.

T_T

Personally I would write a small C program that would

1. find the length of the first line

2. do repetative read/writes to shuffle the data up

3. use ftruncate to remove the length from the end of the file

However I would also recommend you back this file up.

If you know how many lines there actually are....

Code:

wc -l <bigfile.txt

then if there are 70, do the following...

Code:

tail -69 <bigfile.txt >bigfile2.txt

I would try:
sed 1d < bigfile.txt >bigfile2.txt

Thank you very much krab. ^^

i can solved it ^^

If you know the pattern of first line or some word which does not repeat else where in the file,then you can use grep command.

cat filename | grep -v 'pattern' > file_temp
mv file_temp > filename