Chgrp of shell commands

root@bt:~/test# chgrp --helpUsage: chgrp [OPTION]... GROUP FILE...  or:  chgrp [OPTION]... --reference=RFILE FILE...Change the group of each FILE to GROUP.With --reference, change the group of each FILE to that of RFILE.  -c, --changes          like verbose but report only when a change is made      --dereference      affect the referent of each symbolic link (this is                         the default), rather than the symbolic link itself  -h, --no-dereference   affect each symbolic link instead of any referenced                         file (useful only on systems that can change the                         ownership of a symlink)      --no-preserve-root  do not treat `/' specially (the default)      --preserve-root    fail to operate recursively on `/'  -f, --silent, --quiet  suppress most error messages      --reference=RFILE  use RFILE's group rather than specifying a                         GROUP value  -R, --recursive        operate on files and directories recursively  -v, --verbose          output a diagnostic for every file processedThe following options modify how a hierarchy is traversed when the -Roption is also specified.  If more than one is specified, only the finalone takes effect.  -H                     if a command line argument is a symbolic link                         to a directory, traverse it  -L                     traverse every symbolic link to a directory                         encountered  -P                     do not traverse any symbolic links (default)      --help     display this help and exit      --version  output version information and exitExamples:  chgrp staff /u      Change the group of /u to "staff".  chgrp -hR staff /u  Change the group of /u and subfiles to "staff".