Ttyjfyk

The magic money tree problem

I’m planning on buying a laser printer but concerned about the life cycle of toner in the machine

Copycat chess is back

Should I join office cleaning event for free?

New order #4: World

What makes Graph invariants so useful/important?

Why is "Reports" in sentence down without "The"

LED on same Pin as Toggle Switch, not illuminating

Why doesn't Newton's third law mean a person bounces back to where they started when they hit the ground?

My colleague's body is amazing

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XeLaTeX and pdfLaTeX ignore hyphenation

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Why was the small council so happy for Tyrion to become the Master of Coin?

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A function which translates a sentence to title-case

Generate File of a certain size?

How can I limit downloaded file size in wget?Way to determine where certain global parameter is configuredDelete files of certain size rangeFind the total size of certain files within a directory branchAutomatically detect when a file has reached a size limitSort files into directories named by prefix of fileGenerating files of varying variability?Copy All Files With Certain Length File NameHow to generate a set of new different files through shell scripting given a certain pattern name?searching/showing size of files

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

102

30

I'd like to generate a file with the name example.file. I could use

touch example.file

but I want the file to be exactly 24MB in size. I already checked the manpage of touch, but there is no parameter like this. Is there an easy way to generate files of a certain size?

bash command-line files

share|improve this question

edited Nov 16 '13 at 21:14

Gilles

546k12911111625

asked Nov 15 '13 at 19:54

R_UserR_User

613265

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  stackoverflow.com/questions/139261/…
  
  – ire_and_curses
  Nov 15 '13 at 20:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  We will all assume you do not care what the content is so filled with zeroes will be fine.
  
  – Bgs
  Nov 15 '13 at 20:12
  

  
  
  
  

add a comment | 

102

30

I'd like to generate a file with the name example.file. I could use

touch example.file

but I want the file to be exactly 24MB in size. I already checked the manpage of touch, but there is no parameter like this. Is there an easy way to generate files of a certain size?

bash command-line files

share|improve this question

edited Nov 16 '13 at 21:14

Gilles

546k12911111625

asked Nov 15 '13 at 19:54

R_UserR_User

613265

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  stackoverflow.com/questions/139261/…
  
  – ire_and_curses
  Nov 15 '13 at 20:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  We will all assume you do not care what the content is so filled with zeroes will be fine.
  
  – Bgs
  Nov 15 '13 at 20:12
  

  
  
  
  

add a comment | 

I'd like to generate a file with the name example.file. I could use

touch example.file

but I want the file to be exactly 24MB in size. I already checked the manpage of touch, but there is no parameter like this. Is there an easy way to generate files of a certain size?

bash command-line files

share|improve this question

edited Nov 16 '13 at 21:14

Gilles

546k12911111625

asked Nov 15 '13 at 19:54

R_UserR_User

613265

touch example.file

share|improve this question

edited Nov 16 '13 at 21:14

Gilles

546k12911111625

asked Nov 15 '13 at 19:54

R_UserR_User

613265

share|improve this question

edited Nov 16 '13 at 21:14

Gilles

546k12911111625

asked Nov 15 '13 at 19:54

R_UserR_User

613265

edited Nov 16 '13 at 21:14

Gilles

546k12911111625

edited Nov 16 '13 at 21:14

Gilles

546k12911111625

asked Nov 15 '13 at 19:54

R_UserR_User

613265

asked Nov 15 '13 at 19:54

R_UserR_User

613265

5 Answers
5

active

oldest

votes

130

You can use dd:

dd if=/dev/zero of=output.dat bs=24M count=1

or

dd if=/dev/zero of=output.dat bs=1M count=24

or, on Mac,

dd if=/dev/zero of=output.dat bs=1m count=24

share|improve this answer

edited Mar 27 at 15:28

Clay

1033

answered Nov 15 '13 at 20:01

Paul92Paul92

1,453188

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  ... or use bs=1M and count=24. Many find it nicer and easier to read.
  
  – Bgs
  Nov 15 '13 at 20:11
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Maybe dont use huge block sizes, my system did not like bs=1G count=1
  
  – ThorSummoner
  Dec 7 '16 at 0:17
  

  
  
  
  


• 
  
  
  

  
  10
  

  
  
  
  
  
  

  
  
  On the Mac, use 24m (small m), because the Mac doesn't like the big M. dd if=/dev/zero of=output.dat bs=24m count=1
  
  – SPRBRN
  Feb 13 '17 at 13:30
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  On Android (5.1.1, might (not) be version or phone specific) I had to use a lowercase m too.
  
  – Erik
  Apr 12 '18 at 11:56
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  What is the problem with large block sizes specifically? I had hoped to use a 1G block size for a 1G file.
  
  – felwithe
  Jan 5 at 15:03
  

  
  
  
  

 | 
show 1 more comment

42

Under non-embedded Linux or Cygwin (or any system with GNU coreutils) and FreeBSD:

truncate -s 24m example.file

This creates a file full of null bytes. If the file already exists and is smaller, it is extended to the requested size with null bytes. If the file already exists and is larger, is is truncated to the requested size.

The null bytes do not consume any disk space, the file is a sparse file.

On many systems, head -c 24m </dev/zero >example.file creates a non-sparse file full of null bytes. If head doesn't have a -c option on your system (it's common but not in POSIX), you can use dd bs=1024k count=24 </dev/zero >example.file instead (this is POSIX-compliant).

share|improve this answer

answered Nov 17 '13 at 22:18

GillesGilles

546k12911111625

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  BusyBox also has it, so most embedded systems will too :-)
  
  – Ciro Santilli 新疆改造中心996ICU六四事件
  Oct 3 '18 at 1:46
  
  

  
  
  
  

add a comment | 

24

If you don't care about the content of the file, this is much faster than using dd:

fallocate -l 24M filename

Obviously, using dd for a 24MB file won't take any time on a modern system, but larger files can be noticeably slow.

share|improve this answer

edited Sep 26 '17 at 8:14

Socowi

1485

answered Jul 24 '17 at 4:35

SArcherSArcher

35337

add a comment | 

12

You can use dd:

dd if=/dev/zero of=outputfile.out bs=1024k count=24

Or in case you happen to be using Solaris

mkfile 24m outputfile.out

share|improve this answer

answered Nov 15 '13 at 20:25

BitsOfNixBitsOfNix

4,21821832

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  mkfile seems to be present on macOS too
  
  – Ben Flynn
  Sep 19 '16 at 20:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can also pass -n to create a sparse file
  
  – russbishop
  Dec 8 '17 at 17:29
  

  
  
  
  

add a comment | 

0

FROM_NODE=N01;
echo; cd $MOUNT_PATH; pwd; ls -la; sleep 1; echo;
WHEN="$(date +%Y-%m-%d_%H-%M-%S)";
fallocate -l 10M $MOUNT_PATH/"$FROM_NODE"_"$WHEN".dump
ls -lha; echo;

share|improve this answer

answered Jan 19 '17 at 19:52

Pascal AndyPascal Andy

285

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Doesn't this say 10 megs while the Q asks for 24?
  
  – Jeff Schaller♦
  Jan 19 '17 at 20:10
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  fallocate could be a good answer, but why all the other lines? Cut your answer down so that it does just what was asked, and nothing more.
  
  – JigglyNaga
  Jan 19 '17 at 20:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you prefer sir: fallocate -l 10M somefile.dump
  
  – Pascal Andy
  Feb 5 '17 at 18:05
  
  

  
  
  
  

add a comment | 

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130

You can use dd:

dd if=/dev/zero of=output.dat bs=24M count=1

or

dd if=/dev/zero of=output.dat bs=1M count=24

or, on Mac,

dd if=/dev/zero of=output.dat bs=1m count=24

share|improve this answer

edited Mar 27 at 15:28

Clay

1033

answered Nov 15 '13 at 20:01

Paul92Paul92

1,453188

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  ... or use bs=1M and count=24. Many find it nicer and easier to read.
  
  – Bgs
  Nov 15 '13 at 20:11
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Maybe dont use huge block sizes, my system did not like bs=1G count=1
  
  – ThorSummoner
  Dec 7 '16 at 0:17
  

  
  
  
  


• 
  
  
  

  
  10
  

  
  
  
  
  
  

  
  
  On the Mac, use 24m (small m), because the Mac doesn't like the big M. dd if=/dev/zero of=output.dat bs=24m count=1
  
  – SPRBRN
  Feb 13 '17 at 13:30
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  On Android (5.1.1, might (not) be version or phone specific) I had to use a lowercase m too.
  
  – Erik
  Apr 12 '18 at 11:56
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  What is the problem with large block sizes specifically? I had hoped to use a 1G block size for a 1G file.
  
  – felwithe
  Jan 5 at 15:03
  

  
  
  
  

 | 
show 1 more comment

130

You can use dd:

dd if=/dev/zero of=output.dat bs=24M count=1

or

dd if=/dev/zero of=output.dat bs=1M count=24

or, on Mac,

dd if=/dev/zero of=output.dat bs=1m count=24

share|improve this answer

edited Mar 27 at 15:28

Clay

1033

answered Nov 15 '13 at 20:01

Paul92Paul92

1,453188

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  ... or use bs=1M and count=24. Many find it nicer and easier to read.
  
  – Bgs
  Nov 15 '13 at 20:11
  

  
  
  
  


• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  Maybe dont use huge block sizes, my system did not like bs=1G count=1
  
  – ThorSummoner
  Dec 7 '16 at 0:17
  

  
  
  
  


• 
  
  
  

  
  10
  

  
  
  
  
  
  

  
  
  On the Mac, use 24m (small m), because the Mac doesn't like the big M. dd if=/dev/zero of=output.dat bs=24m count=1
  
  – SPRBRN
  Feb 13 '17 at 13:30
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  On Android (5.1.1, might (not) be version or phone specific) I had to use a lowercase m too.
  
  – Erik
  Apr 12 '18 at 11:56
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  What is the problem with large block sizes specifically? I had hoped to use a 1G block size for a 1G file.
  
  – felwithe
  Jan 5 at 15:03
  

  
  
  
  

 | 
show 1 more comment

You can use dd:

dd if=/dev/zero of=output.dat bs=24M count=1

or

dd if=/dev/zero of=output.dat bs=1M count=24

or, on Mac,

dd if=/dev/zero of=output.dat bs=1m count=24

share|improve this answer

edited Mar 27 at 15:28

Clay

1033

answered Nov 15 '13 at 20:01

Paul92Paul92

1,453188

dd if=/dev/zero of=output.dat bs=24M count=1

dd if=/dev/zero of=output.dat bs=1M count=24

dd if=/dev/zero of=output.dat bs=1m count=24

share|improve this answer

edited Mar 27 at 15:28

Clay

1033

answered Nov 15 '13 at 20:01

Paul92Paul92

1,453188

edited Mar 27 at 15:28

Clay

1033

edited Mar 27 at 15:28

Clay

1033

answered Nov 15 '13 at 20:01

Paul92Paul92

1,453188

answered Nov 15 '13 at 20:01

Paul92Paul92

1,453188

42

Under non-embedded Linux or Cygwin (or any system with GNU coreutils) and FreeBSD:

truncate -s 24m example.file

This creates a file full of null bytes. If the file already exists and is smaller, it is extended to the requested size with null bytes. If the file already exists and is larger, is is truncated to the requested size.

The null bytes do not consume any disk space, the file is a sparse file.

On many systems, head -c 24m </dev/zero >example.file creates a non-sparse file full of null bytes. If head doesn't have a -c option on your system (it's common but not in POSIX), you can use dd bs=1024k count=24 </dev/zero >example.file instead (this is POSIX-compliant).

share|improve this answer

answered Nov 17 '13 at 22:18

GillesGilles

546k12911111625

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  BusyBox also has it, so most embedded systems will too :-)
  
  – Ciro Santilli 新疆改造中心996ICU六四事件
  Oct 3 '18 at 1:46
  
  

  
  
  
  

add a comment | 

42

Under non-embedded Linux or Cygwin (or any system with GNU coreutils) and FreeBSD:

truncate -s 24m example.file

This creates a file full of null bytes. If the file already exists and is smaller, it is extended to the requested size with null bytes. If the file already exists and is larger, is is truncated to the requested size.

The null bytes do not consume any disk space, the file is a sparse file.

On many systems, head -c 24m </dev/zero >example.file creates a non-sparse file full of null bytes. If head doesn't have a -c option on your system (it's common but not in POSIX), you can use dd bs=1024k count=24 </dev/zero >example.file instead (this is POSIX-compliant).

share|improve this answer

answered Nov 17 '13 at 22:18

GillesGilles

546k12911111625

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  BusyBox also has it, so most embedded systems will too :-)
  
  – Ciro Santilli 新疆改造中心996ICU六四事件
  Oct 3 '18 at 1:46
  
  

  
  
  
  

add a comment | 

Under non-embedded Linux or Cygwin (or any system with GNU coreutils) and FreeBSD:

truncate -s 24m example.file

This creates a file full of null bytes. If the file already exists and is smaller, it is extended to the requested size with null bytes. If the file already exists and is larger, is is truncated to the requested size.

The null bytes do not consume any disk space, the file is a sparse file.

On many systems, head -c 24m </dev/zero >example.file creates a non-sparse file full of null bytes. If head doesn't have a -c option on your system (it's common but not in POSIX), you can use dd bs=1024k count=24 </dev/zero >example.file instead (this is POSIX-compliant).

share|improve this answer

answered Nov 17 '13 at 22:18

GillesGilles

546k12911111625

truncate -s 24m example.file

share|improve this answer

answered Nov 17 '13 at 22:18

GillesGilles

546k12911111625

answered Nov 17 '13 at 22:18

GillesGilles

546k12911111625

answered Nov 17 '13 at 22:18

GillesGilles

546k12911111625

24

If you don't care about the content of the file, this is much faster than using dd:

fallocate -l 24M filename

Obviously, using dd for a 24MB file won't take any time on a modern system, but larger files can be noticeably slow.

share|improve this answer

edited Sep 26 '17 at 8:14

Socowi

1485

answered Jul 24 '17 at 4:35

SArcherSArcher

35337

add a comment | 

24

If you don't care about the content of the file, this is much faster than using dd:

fallocate -l 24M filename

Obviously, using dd for a 24MB file won't take any time on a modern system, but larger files can be noticeably slow.

share|improve this answer

edited Sep 26 '17 at 8:14

Socowi

1485

answered Jul 24 '17 at 4:35

SArcherSArcher

35337

add a comment | 

If you don't care about the content of the file, this is much faster than using dd:

fallocate -l 24M filename

Obviously, using dd for a 24MB file won't take any time on a modern system, but larger files can be noticeably slow.

share|improve this answer

edited Sep 26 '17 at 8:14

Socowi

1485

answered Jul 24 '17 at 4:35

SArcherSArcher

35337

fallocate -l 24M filename

share|improve this answer

edited Sep 26 '17 at 8:14

Socowi

1485

answered Jul 24 '17 at 4:35

SArcherSArcher

35337

edited Sep 26 '17 at 8:14

Socowi

1485

edited Sep 26 '17 at 8:14

Socowi

1485

answered Jul 24 '17 at 4:35

SArcherSArcher

35337

answered Jul 24 '17 at 4:35

SArcherSArcher

35337

12

You can use dd:

dd if=/dev/zero of=outputfile.out bs=1024k count=24

Or in case you happen to be using Solaris

mkfile 24m outputfile.out

share|improve this answer

answered Nov 15 '13 at 20:25

BitsOfNixBitsOfNix

4,21821832

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  mkfile seems to be present on macOS too
  
  – Ben Flynn
  Sep 19 '16 at 20:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can also pass -n to create a sparse file
  
  – russbishop
  Dec 8 '17 at 17:29
  

  
  
  
  

add a comment | 

12

You can use dd:

dd if=/dev/zero of=outputfile.out bs=1024k count=24

Or in case you happen to be using Solaris

mkfile 24m outputfile.out

share|improve this answer

answered Nov 15 '13 at 20:25

BitsOfNixBitsOfNix

4,21821832

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  mkfile seems to be present on macOS too
  
  – Ben Flynn
  Sep 19 '16 at 20:28
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can also pass -n to create a sparse file
  
  – russbishop
  Dec 8 '17 at 17:29
  

  
  
  
  

add a comment | 

You can use dd:

dd if=/dev/zero of=outputfile.out bs=1024k count=24

Or in case you happen to be using Solaris

mkfile 24m outputfile.out

share|improve this answer

answered Nov 15 '13 at 20:25

BitsOfNixBitsOfNix

4,21821832

mkfile 24m outputfile.out

share|improve this answer

answered Nov 15 '13 at 20:25

BitsOfNixBitsOfNix

4,21821832

answered Nov 15 '13 at 20:25

BitsOfNixBitsOfNix

4,21821832

answered Nov 15 '13 at 20:25

BitsOfNixBitsOfNix

4,21821832

0

FROM_NODE=N01;
echo; cd $MOUNT_PATH; pwd; ls -la; sleep 1; echo;
WHEN="$(date +%Y-%m-%d_%H-%M-%S)";
fallocate -l 10M $MOUNT_PATH/"$FROM_NODE"_"$WHEN".dump
ls -lha; echo;

share|improve this answer

answered Jan 19 '17 at 19:52

Pascal AndyPascal Andy

285

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Doesn't this say 10 megs while the Q asks for 24?
  
  – Jeff Schaller♦
  Jan 19 '17 at 20:10
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  fallocate could be a good answer, but why all the other lines? Cut your answer down so that it does just what was asked, and nothing more.
  
  – JigglyNaga
  Jan 19 '17 at 20:41
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you prefer sir: fallocate -l 10M somefile.dump
  
  – Pascal Andy
  Feb 5 '17 at 18:05
  
  

  
  
  
  

add a comment | 

0

FROM_NODE=N01;
echo; cd $MOUNT_PATH; pwd; ls -la; sleep 1; echo;
WHEN="$(date +%Y-%m-%d_%H-%M-%S)";
fallocate -l 10M $MOUNT_PATH/"$FROM_NODE"_"$WHEN".dump
ls -lha; echo;

share|improve this answer

answered Jan 19 '17 at 19:52

Pascal AndyPascal Andy

285

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Doesn't this say 10 megs while the Q asks for 24?
  
  – Jeff Schaller♦
  Jan 19 '17 at 20:10
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  fallocate could be a good answer, but why all the other lines? Cut your answer down so that it does just what was asked, and nothing more.
  
  – JigglyNaga
  Jan 19 '17 at 20:41
  

  
  
  
  


• 
  
  
  

  
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  If you prefer sir: fallocate -l 10M somefile.dump
  
  – Pascal Andy
  Feb 5 '17 at 18:05
  
  

  
  
  
  

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FROM_NODE=N01;
echo; cd $MOUNT_PATH; pwd; ls -la; sleep 1; echo;
WHEN="$(date +%Y-%m-%d_%H-%M-%S)";
fallocate -l 10M $MOUNT_PATH/"$FROM_NODE"_"$WHEN".dump
ls -lha; echo;

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answered Jan 19 '17 at 19:52

Pascal AndyPascal Andy

285

FROM_NODE=N01;
echo; cd $MOUNT_PATH; pwd; ls -la; sleep 1; echo;
WHEN="$(date +%Y-%m-%d_%H-%M-%S)";
fallocate -l 10M $MOUNT_PATH/"$FROM_NODE"_"$WHEN".dump
ls -lha; echo;

share|improve this answer

answered Jan 19 '17 at 19:52

Pascal AndyPascal Andy

285

answered Jan 19 '17 at 19:52

Pascal AndyPascal Andy

285

answered Jan 19 '17 at 19:52

Pascal AndyPascal Andy

285