chmod

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chmod

When it is necessary to modify the permissions on a particular file or group of files this command is the one to use. It takes the form:

chmod <options> <mode> <files>

<mode> has the form: [ugoa...][[+-=][rwxXstugo...]...][,...]

$\begin{hanging} \item{u} the user who owns the file \item{g} users in the files ... ...group. \item{o} set the permissions to those other than the group. \end{hanging}$

<options>

$\begin{hanging} \item{-c} give a verbose reporting of only the files changed. \i... .... \item{-f} do not print errors about files that were not changed. \end{hanging}$

Example:

chmod g-w ./*

Will remove the group write permissions from all the files in the current directory.