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Darwin, the open source subset of macOS, has behavior that can be set to comply with UNIX 03.
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gznew(1) [bsd man page]

GZNEW(1)						      General Commands Manual							  GZNEW(1)

NAME
gznew - recompress .Z files to .gz files SYNOPSIS
gznew [ -ftv9PK] [ name.Z ... ] DESCRIPTION
gznew recompresses files from .Z (compress) format to .gz (gzip) format. If you want to recompress a file already in gzip format, rename the file to force a .Z extension then apply gznew. OPTIONS
-f Force recompression from .Z to .gz format even if a .gz file already exists. -t Tests the new files before deleting originals. -v Verbose. Display the name and percentage reduction for each file compressed. -9 Use the slowest compression method (optimal compression). -P Use pipes for the conversion to reduce disk space usage. -K Keep a .Z file when it is smaller than the .gz file SEE ALSO
gzip(1), gzmore(1), gzdiff(1), gzgrep(1), gzforce(1), gzexe(1), compress(1) BUGS
gznew does not maintain the time stamp with the -P option if cpmod(1) is not available and touch(1) does not support the -r option. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgzip | +--------------------+-----------------+ |Interface Stability | External | +--------------------+-----------------+ NOTES
Source for gzip is available in the SUNWgzipS package. GZNEW(1)

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GZMORE(1)						      General Commands Manual							 GZMORE(1)

NAME
gzmore - file perusal filter for crt viewing of compressed text SYNOPSIS
gzmore [ name ... ] DESCRIPTION
gzmore is a filter which allows examination of compressed or plain text files one screenful at a time on a soft-copy terminal. gzmore works on files compressed with compress, pack or gzip, and also on uncompressed files. If a file does not exist, gzmore looks for a file of the same name with the addition of a .gz, .z or .Z suffix. gzmore normally pauses after each screenful, printing --More-- at the bottom of the screen. If the user then types a carriage return, one more line is displayed. If the user hits a space, another screenful is displayed. Other possibilities are enumerated later. gzmore looks in the file /etc/termcap to determine terminal characteristics, and to determine the default window size. On a terminal capa- ble of displaying 24 lines, the default window size is 22 lines. To use a pager other than the default more, set environment variable PAGER to the name of the desired program, such as less. Other sequences which may be typed when gzmore pauses, and their effects, are as follows (i is an optional integer argument, defaulting to 1) : i<space> display i more lines, (or another screenful if no argument is given) ^D display 11 more lines (a ``scroll''). If i is given, then the scroll size is set to i. d same as ^D (control-D) iz same as typing a space except that i, if present, becomes the new window size. Note that the window size reverts back to the default at the end of the current file. is skip i lines and print a screenful of lines if skip i screenfuls and print a screenful of lines q or Q quit reading the current file; go on to the next (if any) e or q When the prompt --More--(Next file: file) is printed, this command causes zmore to exit. s When the prompt --More--(Next file: file) is printed, this command causes zmore to skip the next file and continue. = Display the current line number. i/expr search for the i-th occurrence of the regular expression expr. If the pattern is not found, gzmore goes on to the next file (if any). Otherwise, a screenful is displayed, starting two lines before the place where the expression was found. The user's erase and kill characters may be used to edit the regular expression. Erasing back past the first column cancels the search command. in search for the i-th occurrence of the last regular expression entered. !command invoke a shell with command. The character `!' in "command" are replaced with the previous shell command. The sequence "!" is replaced by "!". :q or :Q quit reading the current file; go on to the next (if any) (same as q or Q). . (dot) repeat the previous command. The commands take effect immediately, i.e., it is not necessary to type a carriage return. Up to the time when the command character itself is given, the user may hit the line kill character to cancel the numerical argument being formed. In addition, the user may hit the erase character to redisplay the --More-- message. At any time when output is being sent to the terminal, the user can hit the quit key (normally control-). gzmore will stop sending out- put, and will display the usual --More-- prompt. The user may then enter one of the above commands in the normal manner. Unfortunately, some output is lost when this is done, due to the fact that any characters waiting in the terminal's output queue are flushed when the quit signal occurs. The terminal is set to noecho mode by this program so that the output can be continuous. What you type will thus not show on your termi- nal, except for the / and ! commands. If the standard output is not a teletype, then gzmore acts just like zcat, except that a header is printed before each file. FILES
/etc/termcap Terminal data base SEE ALSO
more(1), gzip(1), gzdiff(1), gzgrep(1), gznew(1), gzforce(1), gzexe(1) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +--------------------+-----------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +--------------------+-----------------+ |Availability | SUNWgzip | +--------------------+-----------------+ |Interface Stability | External | +--------------------+-----------------+ NOTES
Source for gzip is available in the SUNWgzipS package. GZMORE(1)

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