how to create dump file

[avizen9]

Hello,
i need to create dump file around 100mb for some testing purpose, how to create it.

i have done this before but forgot :),

surely assign point for each response,

[Steven Schweda]

Define "dump file".

What do you want in the file?

"m" = milli. "M" = mega.
"b" = bit. "B" = byte.
"mb" = millibit, which is a pretty small
unit. (Too small to be useful, in fact.)

[Vitaly Karasik_1 · Accepted solution]

do you mean "crash dump" file or just big file?
- in 1st case - send "create dump" signal to some big (100mb) process, for example

kill -ABRT pid_of_process

(ulimit should allow it - "ulimit -c unlimited")

- in 2nd case
dd if=/dev/zero of=/tmp/100mb bs=1024k count=100

[Viktor Balogh]

there is a command for preallocating disk space, see 'man prealloc'