linux truncate - empty(clear) file in linux

[daredevil]

To clear / truncate / empty file in linux u can use below command from bash:

 

cat /dev/null >| filename

 

Does anyone know any other commands to achieve the same thing in linux?

[Krauersaut]

echo "" > filename

 

:> filename

 

>filename

 

rm filename && touch filename

 

cat /dev/null > filename

 

truncate -s0 filename

[PiNoY]

try below

 

cp /dev/null filename

 

while the next one below will give you a visually empty file but the size of the file would still be 1 since

""

is a character #13 or #10 which is invincible to human eyes.

echo "" > filename

 

also, the below code should be executed under the actual ownership of the file, so it doesnt change file ownership and access.

rm filename && touch filename

 

If you are root and going to do the last command with file(s) owned by postfix or named, the last command above is critical and may create another issue for you I think so.

Edited May 30, 2012 by PiNoY