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       exifcom  -  display or set the UserComment tag contained in a JPEG Exif


       exifcom [ -bfinv ] [ -w comment ] [ -s delim ] file ...


       When invoked  without  arguments,  the  exifcom  utility  displays  the
       contents  of the Exif UserComment tag contained in file to the standard
       output.  Otherwise, depending on the options  specified,  exifcom  will
       blank the tag or set it to comment.

       Some  digital  cameras  include  a standard UserComment tag in the Exif
       data added to the image files they produce.  This comment tag is fixed-
       length  and  supports  multi-byte  character  sets (though exifcom does
       not).  Note that not all cameras will include the tag.

       The utility is conservative in its approach to writing the  UserComment
       tag.   It  does  not modify, extend, or otherwise adulterate an image’s
       Exif metadata structure.  When writing the tag it merely  changes  pre-
       allocated  bytes.   Therefore, exifcom is at the mercy of the Exif data
       creator for both the presence of the tag and  its  length.   It  cannot
       create  a UserComment tag when the camera does not include one, nor can
       it write a comment longer than the space pre-allocated by  the  camera.
       exifcom only displays and writes ASCII character set comments.


       -b     Blank  the  UserComment tag, overwriting both the character code
              and comment fields with NUL.  The character code  specifies  how
              the  comment is represented; it is "undefined" when blank.  This
              is the state to which many cameras  initialize  the  tag.   When
              used  in  conjunction with the -w option, exifcom will blank the
              comment prior to setting it to comment.

       -f     Overwrite or blank  existing  or  unsupported  comments  without
              prompting for confirmation.

       -i     Write  a prompt to standard error before overwriting or blanking
              an existing or unsupported comment.  If the  response  from  the
              standard   input   begins  with  ’y’  or  ’Y’,  the  comment  is
              overwritten.  This option is default behavior.

       -n     Do not overwrite or blank existing or unsupported  comments  and
              do  not prompt for confirmation (i.e., automatically answer ’no’
              to a confirmation prompt).  This option  takes  precedence  over
              both the -f and -i options.

       -s     Separate  field  name and value in the verbose and multiple file
              cases with the string delim.  The default is ’: ’.

       -v     Be verbose when printing the contents of  the  UserComment  tag.
              Besides  the  comment itself (if present and supported), exifcom
              will display the maximum comment length supported, the character
              code of the comment, and the length of the comment.

       -w     Set  UserComment  to  the  ASCII  string comment.  If comment is
              longer than what the tag supports, it will be truncated to  fit.


       The exifcom utility exits 0 on success.  When displaying a comment from
       a single file, if the UserComment tag is missing, it exits 1; if blank,
       it  exits  2;  if  in  an  unsupported  character  code,  it  exits  3.
       Otherwise, it exits 1 if an error occurs.


       exiftags(1), exiftime(1)


       The exifcom utility was developed using the January 2002 Exif standard,
       version 2.2 (


       If the tag doesn’t exist or is too short, too bad.


       The  exifcom utility and this man page were written by Eric M. Johnston