UNIX for Dummies Questions & Answers

hi i would like to know whether i can delete a part of a file in C
for eg. if my file contained
1234567890
and i want to delete
456
so that it becomes
1237890

is there a way i can do this.

well, one way i can achieve this is by creating a new file, copy whatever i want, then delete the old file and rename the new file with the name of the old file.
but i was wondering whether it can be done in directly, i.e. without doing any copies.

plz help
regards

sed 's/456//' /file > /tmp/file ; mv /tmp/file /file

not C but works fine, but I'm not shure if thats what you want

thats not what i want to do
actually the file is a binary file and say i want to seek 500 bytes in the file and then delete 200bytes from that point.