UNIX for Advanced & Expert Users

perl -e 'for($i=0;$i<26;$i++){print chr(ord('A')+$i)x40,"\n";}' > test1.txt
head -13 test1.txt > part1.txt
tail -13 test1.txt > part2.txt

Here is an example of "tail" going wrong on one of my logs:

tail -200 mylog|wc -l
200

ukh44004 # tail -300 mylog|wc -l
218

tail -400 mylog|wc -l
218

head -1000 abc.txt               _______this will give you the first 1000 lines
tail -1000 abc.txt                 ________this will give the last 1000 lines

so (> acd.txt) which yu added to the above command wil just create a file or override to the existed file .

note:like if you write cat file >new_file _______________here same thing happens. 

not the head command will create file.

sed -n '1,1000 p' abc.txt > acd.txt
sed -n '1001,$ p' abc.txt > bcd.txt