July 19, at The solution for me was to use the free The Unarchiverwhich has turned out to be a Swiss army knife for decompressing many obscure types of archives. I just tried changing the original extension of. May 30, at 9: Downloading from another browser worked. How to Open a Zip File That Turns Into a CPGZ Last night, I downloaded a zip archive of freely-distributed MP3 files, and when I double-clicked it to decompress it, all I got was file. I was emailed file that I really want to open but when I try to unzip it only creates file then or anotherzip. CPGZ file file, or how to convert CPGZ to PDF, ZIP, SRT, etc. By convention, the file name of an archive is usually given the file extension cpio.A CPGZ file is a Compressed UNIX CPIO Archive file. The resulting cpio archive is a sequence of files and directories concatenated into a single archive, separated by header sections with file meta information, such as filename, inode number, ownership, permissions, and timestamps. Cpio is therefore typically used with other utilities that generate the list of files to be archived, such as the find program. When creating archives during the copy-out operation, initiated with the -o command line flag, cpio reads file and directory path names from its standard input channel and writes the resulting archive byte stream to its standard output. It does not compress any content, but resulting archives are often compressed using gzip or other external compressors. Operation and archive format Ĭpio was originally designed to store backup file archives on a tape device in a sequential, contiguous manner. Most notable is the change, now an operational option, from the use of a binary format of archive file meta information to an ASCII-based representation.Ĭpio appeared in Version 7 Unix as part of the Programmer's Workbench project. Since its original design, cpio and its archive file format have undergone several, sometimes incompatible, revisions. The use of cpio by the RPM Package Manager, in the initramfs program of Linux kernel 2.6, and in Apple's Installer ( pax) make cpio an important archiving tool. Its name is derived from the phrase copy in and out, in close description of the program's use of standard input and standard output in its operation.Īll variants of Unix also support other backup and archiving programs, such as tar, which has become more widely recognized. The software utility was originally intended as a tape archiving program as part of the Programmer's Workbench ( PWB/UNIX), and has been a component of virtually every Unix operating system released thereafter.
It is primarily installed on Unix-like computer operating systems. Cpio is a general file archiver utility and its associated file format.
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