getpix
Commands

filename: Name of IRAF image header file or FITS file. This must be present. If reading from multiple files, put filename(s) after all other arguments.
x range: Range of x coordinate values. If 0, print all columns. If reading multiple files, this must be on the command line before the filenames. Note that range combination of "0 0" only works in the presence of -l or -g. (Range added in WCSTools 2.6.3)
y range: Range of y coordinate values. If 0, print all rows. If reading multiple files, this must be on the command line before the filenames. Note that range combination of "0 0" only works in the presence of -l or -g. (Range added in WCSTools 2.6.3)
-g number: Print only pixels the values of which are greater than num. Coordinates are printed with each pixel value. (added in WCSTools 2.6.10)
-l number: Print only pixels the values of which are less than num. Coordinates are printed with each pixel value. (added in WCSTools 2.6.10)
-n number: Number of pixel values output per line, if different then number in range. (added in WCSTools 2.6.3)
-p: Print pixel numbers along with pixel values. This is useful if a two-dimensional section of an image is being printed. (added in WCSTools 2.6.3)
-v: Print more information about the process