How make a file with 1 GB?

[AIXRALF]

Hello,

have you a script that write a 1 GB file to disk (testdata). I use echo (in a loop), but it is very slow.

echo "$STRING" >> /test.log

Any Idea?

Thank you ...

 

[ChrisCW]

Perhaps you could tar a large directory?? For example tar the /usr directory??

ChrisCW

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[iribach]

man ls >a
cat a a a a a a a a a a a >b
cat b b b b b b b b b b b >a
cat a a a a a a a a a a a >b
cat b b b b b b b b b b b >a
cat a a a a a a a a a a a >b
cat b b b b b b b b b b b >a
cat a a a a a a a a a a a >b
cat b b b b b b b b b b b >a
cat a a a a a a a a a a a >b
cat b b b b b b b b b b b >a
....

 

[olded]

Aixralf:

Analogous to /dev/null, unix has a special device called /dev/zero. You can use it to create large files. This dd command example creates a 1Meg file:

dd if=/dev/zero of=bigfile bs=1000 count=1000

Of course, bigfile is just a bunch of zeros with LFs, but it is a large file.

Regards,


Ed

 

[predamarcel]

also depends about your OS.
for example on Solaris8 is `mkfile'


mkfile - create a file

SYNOPSIS
mkfile [ -nv ] size [ k | b | m ] filename ...



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[olded]

Hi:

correction above:

bigfile is just a bunch of zeros with LFs,

should read:

bigfile is just a bunch of zeros withOUT LFs,


Sorry,

Ed