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Top Forums UNIX for Dummies Questions & Answers echo appends to a read-only file Post 302382352 by thegeek on Wednesday 23rd of December 2009 05:01:42 AM
Old 12-23-2009
buddy, you have to understand this thing, root has all power.

For super user, the permission bits will not be cross checked, so not only echo, cat, other editors and anything can edit the files if you are working as super user.

From wiki:
Code:
root is the conventional name of the user who has all rights or permissions (to all files and programs)

 

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EDQUOTA(8)						      System Manager's Manual							EDQUOTA(8)

NAME
edquota - edit user quotas SYNOPSIS
edquota [ -p proto-user ] users... DESCRIPTION
Edquota is a quota editor. One or more users may be specified on the command line. For each user a temporary file is created with an ASCII representation of the current disc quotas for that user and an editor is then invoked on the file. The quotas may then be modified, new quotas added, etc. Upon leaving the editor, edquota reads the temporary file and modifies the binary quota files to reflect the changes made. If the -p option is specified, edquota will duplicate the quotas of the prototypical user specified for each user specified. This is the normal mechanism used to initialize quotas for groups of users. The editor invoked is vi(1) unless the environment variable EDITOR specifies otherwise. Only the super-user may edit quotas. FILES
quotas at the root of each file system with quotas /etc/fstab to find file system names and locations SEE ALSO
quota(1), quota(2), quotacheck(8), quotaon(8), repquota(8) DIAGNOSTICS
Various messages about inaccessible files; self-explanatory. BUGS
The format of the temporary file is inscrutable. 4.2 Berkeley Distribution May 19, 1986 EDQUOTA(8)
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