Open System Services Shell and Utilities Reference Manual (G06.25+, H06.03+)

User Commands (p - r) pr(1)
5. To modify a file for later use, enter:
pr -t -e prog.c > prog.notab.c
This replaces tab characters in prog.c with spaces and puts the result in prog.notab.c.
Tab positions are at byte positions 9, 17, 25, 33, and so on. The -e tells pr to replace the
tab characters; the -t suppresses the page headings.
RELATED INFORMATION
Commands: cat(1).
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