Alphabetical Summary of sed Commands
GNU sed lets you use the filenames /dev/stdin, /dev/stdout and /dev/stderr to refer to standard input, output, and error, respectively, for the r, R, w, and W commands and the w flag to the s command.
GNU-specific commands or extensions are noted with {G} in the command synopsis. When the GNU version allows a command to have two addresses, the command is performed for each input line within the range.
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