CH(1): change file attributes
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     USAGE
         usage: ch [-D] {attr value}
             -D: debug
     DESCRIPTION
      ch changes zx attributes for files.
     The fake attribute uids can be used to change both uid  and  gid.
     The  attribute  mode admits as a value the forms +rwx and -rwx to
     add or remove those bits.
     The value for the size attribute admits a trailing k, m, or g  to
     indicate  a  size  expressed  as an integral number of Kibibytes,
     Mibibytes, or Gibibytes.
     EXAMPLES
     Add read permission to all files within the current directory:
         ; lf , | ch mode +r
     Create a file with 1M of zeros:
         ; eco -n >file
         ; lf file | ch size 1m
     SOURCE
     +o    /zx/sys/src/clive/cmd/ch
     SEE ALSO
     +o    dir(3) for a description of attributes.
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      User's manual. Section 1. Copyright © LSUB 2014-2016