Create A File

big123456 · #1 (**permalink**) 05-22-2007

Hi,
under Linux REDHAT how to create an empty file with a defined size ?
How to put it at the end of another file ?
Many thanks.

zazzybob · #2 (**permalink**) 05-22-2007

To create a 1M file:

Code:

$ dd if=/dev/zero of=./tmpfile bs=1024 count=1024
1024+0 records in
1024+0 records out
1048576 bytes transferred in 0.033088 secs (31690552 bytes/sec)
$ ls -lh ./tmpfile
-rw-r--r--   1 user group       1M May 22 17:09 ./tmpfile

This file will be filled with \0's (NUL's - man ascii).

If you really want to append this to another file, you could do

Code:

$ cat somefile tmpfile > newfile
$ mv newfile somefile

after creating tmpfile.

Cheers
ZB

big123456 · #3 (**permalink**) 05-22-2007

Thank you.

the_learner · #4 (**permalink**) 05-23-2007

how about

mkfile -n <size>

e.g:

mkfile -n 20k

(not sure, this works for me on solaris though)

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