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To empty the file completely, use -s 0 in your command. Add a plus or minus sign in front of the number to increase or decrease the file by the given amount. If you don't have proper permissions on the file you're trying to truncate, you can usually just preface the command with sudo .
Under Linux and UNIX user cannot remove or modify file if they don't have a write permission. You can use normal chmod command for this purpose. Method #2 : You need to use chattr command which changes the file attributes on a Linux second extended (ext2 / ext3) file system.
To remove (or delete) a file in Linux from the command line, use either the rm (remove) or unlink command.
You have the noclobber option set. The error looks like it's from csh, so you would do:
cat /dev/null >! file
If I'm wrong and you are using bash, you should do:
cat /dev/null >| file
in bash, you can also shorten that to:
>| file
You can also use function truncate
$truncate -s0 yourfile
if permission denied, use sudo
$sudo truncate -s0 yourfile
Help/Manual: man truncate
tested on ubuntu Linux
This will be enough to set the file size to 0:
> error.log
the credit goes for my senior colleague for this:
:> filename
This will not break log files, so you can even use it on syslog, for example.
false|tee fileToTruncate
may work as well
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