pg is a terminal pager program on Unix and Unix-like systems for viewing text files. It can also be used to page through the output of a command via a pipe. pg uses an interface similar to vi, but commands are different.
pg is the name of the historical utility on BSD UNIX systems. It was written to address the limit of the historical more command not being able to traverse the input backward. Eventually that ability was added also to more, so both are quite similar.
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