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When the input file is not a regular file, (such as a directory), it is left unaltered. (Relevant only for -v.) - not a regular file: unchanged Percentage of the input saved by compression. uncompress: corrupt inputĪ SIGSEGV violation was detected, which usually means that the input file is corrupted. Respond y if you want the output file to be replaced n if not. file: already exists do you wish to overwrite (y or n)? The file is assumed to be already compressed. file: compressed with xxbits, can only handle yybitsįile was compressed by a program that could deal with more bits than the compressĬode on this machine. The file specified to uncompress has not been compressed. Maxbits must follow -b, or invalid maxbits, not a numeric value. Invalid options were specified on the command line.
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Ln(1), pack(1), attributes(5), environ(5), largefile(5) DIAGNOSTICS See attributes(5) for descriptions of the following attributes: ATTRIBUTE TYPE One or more files were not compressed because they would have increased in size (and the -f option was not specified). The following error values are returned: 0 See environ(5) for descriptions of the following environment variables that affect the execution of compress, uncompress,Īnd zcat: LC_CTYPE, LC_MESSAGES, and NLSPATH. See largefile(5) for the description of the behavior of compress, uncompress, and zcat when encounteringįiles greater than or equal to 2 Gbyte ( 2 31 bytes). If file is -, or if no file is specified, the standard input will be used. OPERANDSĪ path name of a file to be compressed by compress, uncompressed by uncompress, or whose uncompressedįorm is written to standard out by zcat. Lowering the number of bits will result in larger, less compressed files. bits must be between 9 and 16 (16 is the default). Sets the upper limit (in bits) for common substring codes. Writes to standard error messages concerning the percentage reduction or expansion of each file. If the standard input is not a terminal and -f is not given, writes a diagnostic message to standard error and exits with a status greater than 0. If the -f option is not given,Īnd the process is not running in the background, prompts to verify whether an existing file should be overwritten. When uncompressing, does not prompt for overwriting files. If the -f option is not given, and the process is not running in the background, prompts to verify whether an existing file. When compressing, forces compression of file, even if it does not actually reduce the size of the file, or if the corresponding file. Writes to the standard output no files are changed and no. The zcat utility will write to standard output the uncompressed form of files that have been compressed using compress. For files produced by compress on other systems, uncompress supports 9- to 16-bit compression (see -b). This utility supports the uncompressing of any files produced by compress. If no files are specified, the standard input will be uncompressed to the standard output. The uncompress utility will restore files to their original state after they have been compressed using the compress utility. With a magic number to ensure that neither decompression of random data nor recompression of compressed data is subsequently allowed. The bits parameter specified during compression is encoded within the compressed file, along Compression is generally much better than that achievedīy Huffman coding (as used in pack(1)), and takes less time to compute.
#COMPRESS DATA AND RECOMPRESS IT TO ITS ORIGINAL STATE CODE#
Typically, text such as source code or English is reduced by 50-60%. The amount of compression obtained depends on the size of the input, the number of bits per code, and the distribution of common substrings. If no files are specified, the standard input will be compressed to the standard output. Z to the file pathname would make the pathname exceed 1023 bytes, the command will fail. Z, while keeping the same ownership modes, change Except when the output is to the standard output, each file will be replaced by one with the extension. The compress utility will attempt to reduce the size of the named files by using adaptive Lempel-Ziv coding. Compress, uncompress, zcat- compress, uncompress files or display expanded files SYNOPSIS
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