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to create a file of specified size

 
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# 1  
Old 04-06-2005
to create a file of specified size
hi guys,
Is there any way to create a file of specified size ..ie...during creation itself u should be able to specify the size of it...
# 2  
Old 04-06-2005
yes there is. I know of a command called "prealloc". It is used to create a file of a particular size.

# prealloc name size ( in bytes)

File must not exist or it will fail...
# 3  
Old 04-06-2005
You can also create a test file of a general size by using the command yes but wrapped with a test to ensure you size is correct.

see man yes

Code:
EXPECTED=10000
do
yes 111111111 > big_file.txt
SIZE=$(ll big_file.txt | awk '{print $2}')
until [ $SIZE = $EXPECTED ]

cant remember if file size is the second or third field off hand in a long listing. Change as appropriate. Also, didnt test this.
# 4  
Old 04-06-2005
if i use the cmd "prealloc" it echo error msg that the command is not found...
my OS release Linux 2.4.18-3
# 5  
Old 04-06-2005
on solaris there is a command called mkfile
gP
# 6  
Old 04-06-2005
Whoa! That "yes" solution won't work. The yes command command will try to run forever. And for the record, prealloc is HP-UX only.
# 7  
Old 04-06-2005
Oops! Forgot that you need to CNTRL-C yes! Whoops big mistake. Well, its easy enough to run yes for a short couple of seconds then kill it. Trim the file afterwards as needed. My bad - sorry for leading folks astray. Smilie
 
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