Linux and Unix unzip command
unzip will list, test, or extract files from a ZIP archive, commonly found on MS-DOS systems. The default behavior (with no options) is to extract into the current directory (and subdirectories below it) all files from the specified ZIP archive. A companion program, zip, creates ZIP archives; both programs are compatible with archives created by PKWAREE'sPKZIP and PKUNZIP for MS-DOS, but in many cases the program options or default behaviors differ.PKZIP and PKUNZIP for MS-DOS, but in many cases the program options or default behaviors differ.
unzip [-Z] [-cflptTuvz[abjnoqsCKLMVWX$/:]] file[.zip] [file(s) ...] [-x xfile(s) ...] [-d exdir]
|-Z||zipinfo mode. If the first option on the command line is -Z, the remaining options are taken to be zipinfo options. See the appropriate manual page for a description of these options.|
|-A||[OS/2, Unix DLL] print extended help for the DLL's programming interface (API).|
|-c||extract files to stdout/screen ("CRT"). This option is similar to the -p option except that the name of each file is printed as it is extracted, the -a option is allowed, and ASCII-EBCDIC conversion is automatically performed if appropriate. This option is not listed in the unzip usage screen.|
|-f||freshen existing files, i.e., extract only those files that already exist on disk and that are newer than the disk copies. By default unzip queries before overwriting, but the -o option may be used to suppress the queries. Note that under many operating systems, the TZ (timezone) environment variable must be set correctly in order for -f and -u to work properly (under Unix the variable is usually set automatically). The reasons for this are somewhat subtle but have to do with the differences between DOS-format file times (always local time) and Unix-format times (always in GMT/UTC) and the necessity to compare the two. A typical TZ value is "PST8PDT" (US Pacific time with automatic adjustment for Daylight Savings Time or "summer time").|
|-l||list archive files (short format). The names, uncompressed file sizes and modification dates and times of the specified files are printed, along with totals for all files specified. If UnZip was compiled with OS2_EAS defined, the -l option also lists columns for the sizes of stored OS/2 extended attributes (EAs) and OS/2 access control lists (ACLs). In addition, the zipfile comment and individual file comments (if any) are displayed. If a file was archived from a single-case file system (for example, the old MS-DOS FAT file system) and the -L option was given, the filename is converted to lowercase and is prefixed with a caret (^).|
|-p||extract files to pipe (stdout). Nothing but the file data is sent to stdout, and the files are always extracted in binary format, just as they are stored (no conversions).|
|-t||test archive files. This option extracts each specified file in memory and compares the CRC (cyclic redundancy check, an enhanced checksum) of the expanded file with the original file's stored CRC value.|
|-T||[most OSes] set the timestamp on the archive(s) to that of the newest file in each one. This corresponds to zip's -go option except that it can be used on wildcard zipfiles (e.g., "unzip -T \*.zip") and is much faster.|
|-u||update existing files and create new ones if needed. This option performs the same function as the -f option, extracting (with query) files that are newer than those with the same name on disk, and in addition it extracts those files that do not already exist on disk. See -f above for information on setting the timezone properly.|
|-v||be verbose or print diagnostic version info. This option has evolved and now behaves as both an option and a modifier. As an option it has two purposes: when a zipfile is specified with no other options, -v lists archive files verbosely, adding to the basic -l info the compression method, compressed size, compression ratio and 32-bit CRC. In contrast to most of the competing utilities, unzip removes the 12 additional header bytes of encrypted entries from the compressed size numbers. Therefore, compressed size and compression ratio figures are independent of the entry's encryption status and show the correct compression performance. (The complete size of the encryped compressed data stream for zipfile entries is reported by the more verbose zipinfo(1L) reports, see the separate manual.) When no zipfile is specified (that is, the complete command is simply "unzip -v"), a diagnostic screen is printed. In addition to the normal header with release date and version, unzip lists the home Info-ZIP ftp site and where to find a list of other ftp and non-ftp sites; the target operating system for which it was compiled, as well as (possibly) the hardware on which it was compiled, the compiler and version used, and the compilation date; any special compilation options that might affect the program's operation (see also DECRYPTION below); and any options stored in environment variables that might do the same (see ENVIRONMENT OPTIONS below). As a modifier it works in conjunction with other options (e.g., -t) to produce more verbose or debugging output; this is not yet fully implemented but will be in future releases.|
|-z||display only the archive comment.|
|-a||convert text files. Ordinarily all files are extracted exactly as they are stored (as "binary" files). The -a option causes files identified by zip as text files (those with the 't' label in zipinfo listings, rather than 'b') to be automatically extracted as such, converting line endings, end-of-file characters and the character set itself as necessary. (For example, Unix files use line feeds (LFs) for end-of-line (EOL) and have no end-of-file (EOF) marker; Macintoshes use carriage returns (CRs) for EOLs; and most PC operating systems use CR+LF for EOLs and control-Z for EOF. In addition, IBM mainframes and the Michigan Terminal System use EBCDIC rather than the more common ASCII character set, and NT supports Unicode.) Note that zip's identification of text files is by no means perfect; some "text" files may actually be binary and vice versa. unzip therefore prints "[text]" or "[binary]" as a visual check for each file it extracts when using the -a option. The -aa option forces all files to be extracted as text, regardless of the supposed file type.|
|-b||[general] treat all files as binary (no text conversions). This is a shortcut for ---a.|
|-b||[Tandem] force the creation files with filecode type 180 ('C') when extracting Zip entries marked as "text". (On Tandem, -a is enabled by default, see above).|
|-b||[VMS] auto-convert binary files (see -a above) to fixed-length, 512-byte record format. Doubling the option (-bb) forces all files to be extracted in this format. When extracting to standard output (-c or -p option in effect), the default conversion of text record delimiters is disabled for binary (-b) resp. all (-bb) files.|
|-B||[Unix only, and only if compiled with UNIXBACKUP defined] save a backup copy of each overwritten file with a tilde appended (e.g., the old copy of "foo" is renamed to "foo~"). This is similar to the default behavior of emacs in many locations.|
|-C||use case-insensitive matching for the selection of archive entries from the command-line list of extract selection patterns. unzip's
philosophy is "you get what you ask for" (this is also responsible for the -L/-U change; see the relevant options below). Because
some file systems are fully case-sensitive (notably those under the Unix operating system) and because both ZIP archives and unzip itself are
portable across platforms, unzip's default behavior is to match both wildcard and literal filenames case-sensitively. That is, specifying "makefile"
on the command line will only match "makefile" in the archive, not "Makefile" or "MAKEFILE" (and similarly for
wildcard specifications). Since this does not correspond to the behavior of many other operating/file systems (for example, OS/2 HPFS, which
preserves mixed case but is not sensitive to it), the -C option may be used to force all filename matches to be case-insensitive. In the example
above, all three files would then match "makefile" (or "make*", or similar). The -C option affects file specs in both the
normal file list and the excluded-file list (xlist).
Please note that the -L option does neither affect the search for the zipfile(s) nor the matching of archive entries to existing files on the extraction path. On a case-sensitive file system, unzip will never try to overwrite a file "FOO" when extracting an entry "foo"!
|-E||[MacOS only] display contents of MacOS extra field during restore operation.|
|-F||[Acorn only] suppress removal of NFS fileType extension from stored filenames.|
|-F|| [non-Acorn systems supporting long filenames with embedded commas, and only if compiled with ACORN_FType_NFS defined] translate fileType
information from ACORN RISC OS
extra field blocks into a NFS fileType extension and append it to the names of the extracted files. (When the stored filename appears to already have an appended NFS fileType extension, it is replaced by the info from the extra field.)
|-i||[MacOS only] ignore filenames stored in MacOS extra fields. Instead, the most compatible filename stored in the generic part of the entry's header is used.|
|-j||junk paths. The archive's directory structure is not recreated; all files are deposited in the extraction directory (by default, the current one).|
|-J||[BeOS only] junk file attributes. The file's BeOS file attributes are not restored, just the file's data.|
|-J||[MacOS only] ignore MacOS extra fields. All Macintosh specific info is skipped. Data-fork and resource-fork are restored as separate files.|
|-K||[AtheOS, BeOS, Unix only] retain SUID/SGID/Tacky file attributes. Without this flag, these attribute bits are cleared for security reasons.|
|-L||convert to lowercase any filename originating on an uppercase-only operating system or file system. (This was unzip's default behavior in releases prior to 5.11; the new default behavior is identical to the old behavior with the -U option, which is now obsolete and will be removed in a future release.) Depending on the archiver, files archived under single-case file systems (VMS, old MS-DOS FAT, etc.) may be stored as all-uppercase names; this can be ugly or inconvenient when extracting to a case-preserving file system such as OS/2 HPFS or a case-sensitive one such as under Unix. By default unzip lists and extracts such filenames exactly as they're stored (excepting truncation, conversion of unsupported characters, etc.); this option causes the names of all files from certain systems to be converted to lowercase. The -LL option forces conversion of every filename to lowercase, regardless of the originating file system.|
|-M||pipe all output through an internal pager similar to the Unix more(1) command. At the end of a screenful of output, unzip pauses with a "--More--" prompt; the next screenful may be viewed by pressing the Enter (Return) key or the space bar. unzip can be terminated by pressing the "q" key and, on some systems, the Enter/Return key. Unlike Unix more, there is no forward-searching or editing capability. Also, unzip doesn't notice if long lines wrap at the edge of the screen, effectively resulting in the printing of two or more lines and the likelihood that some text will scroll off the top of the screen before being viewed. On some systems the number of available lines on the screen is not detected, in which case unzip assumes the height is 24 lines.|
|-n||never overwrite existing files. If a file already exists, skip the extraction of that file without prompting. By default unzip queries before extracting any file that already exists; the user may choose to overwrite only the current file, overwrite all files, skip extraction of the current file, skip extraction of all existing files, or rename the current file.|
|-N||[Amiga] extract file comments as Amiga filenotes. File comments are created with the -c option of zip(1L), or with the -N option of the Amiga port of zip, which stores filenotes as comments.|
|-o||overwrite existing files without prompting. This is a dangerous option, so use it with care. (It is often used with -f, however, and is the only way to overwrite directory EAs under OS/2.)|
|-P password||use password to decrypt encrypted zipfile entries (if any). THIS IS INSECURE! Many multi-user operating systems provide ways for any user to see the current command line of any other user; even on stand-alone systems there is always the threat of over-the-shoulder peeking. Storing the plaintext password as part of a command line in an automated script is even worse. Whenever possible, use the non-echoing, interactive prompt to enter passwords. (And where security is truly important, use strong encryption such as Pretty Good Privacy instead of the relatively weak encryption provided by standard zipfile utilities.)|
|-q||perform operations quietly (-qq = even quieter). Ordinarily unzip prints the names of the files it's extracting or testing, the extraction methods, any file or zipfile comments that may be stored in the archive, and possibly a summary when finished with each archive. The -q[q] options suppress the printing of some or all of these messages.|
|-s||[OS/2, NT, MS-DOS] convert spaces in filenames to underscores. Since all PC operating systems allow spaces in filenames, unzip by default extracts filenames with spaces intact (e.g., "EA DATA. SF"). This can be awkward, however, since MS-DOS in particular does not gracefully support spaces in filenames. Conversion of spaces to underscores can eliminate the awkwardness in some cases.|
|-U||(obsolete; to be removed in a future release) leave filenames uppercase if created under MS-DOS, VMS, etc. See -L above.|
|-V||retain (VMS) file version numbers. VMS files can be stored with a version number, in the format file.ext;##. By default the ";##" version numbers are stripped, but this option allows them to be retained. (On file systems that limit filenames to particularly short lengths, the version numbers may be truncated or stripped regardless of this option.)|
|-W||[only when WILD_STOP_AT_DIR compile-time option enabled] modifies the pattern matching routine so that both '?' (single-char wildcard)
and '*' (multi-char wildcard) do not match the directory separator character '/'. (The two-character sequence "**"
acts as a multi-char wildcard that includes the directory separator in its matched characters.) Examples:
"*.c" matches "foo.c" but not "mydir/foo.c"
"**.c" matches both "foo.c" and "mydir/foo.c"
"*/*.c" matches "bar/foo.c" but not "baz/bar/foo.c"
"??*/*" matches "ab/foo" and "abc/foo"
but not "a/foo" or "a/b/foo"
This modified behavior is equivalent to the pattern matching style used by the shells of some of UnZip's supported target OSs (one example is Acorn RISC OS). This option may not be available on systems where the Zip archive's internal directory separator character '/' is allowed as regular character in native operating system filenames. (Currently, UnZip uses the same pattern matching rules for both wildcard zipfile specifications and zip entry selection patterns in most ports. For systems allowing '/' as regular filename character, the -W option would not work as expected on a wildcard zipfile specification.)
|-X||[VMS, Unix, OS/2, NT] restore owner/protection info (UICs) under VMS, or user and group info (UID/GID) under Unix, or access control lists (ACLs) under certain network enabled versions of OS/2 (Warp Server with IBM LAN Server/Requester 3.0 to 5.0; Warp Connect with IBM Peer 1.0), or security ACLs under Windows NT. In most cases this will require special system privileges, and doubling the option (-XX) under NT instructs unzip to use privileges for extraction; but under Unix, for example, a user who belongs to several groups can restore files owned by any of those groups, as long as the user IDs match his or her own. Note that ordinary file attributes are always restored--this option applies only to optional, extra ownership info available on some operating systems. [NT's access control lists do not appear to be especially compatible with OS/2's, so no attempt is made at cross-platform portability of access privileges. It is not clear under what conditions this would ever be useful anyway.]|
|-$||[MS-DOS, OS/2, NT] restore the volume label if the extraction medium is removable (e.g., a diskette). Doubling the option (-$$) allows fixed media (hard disks) to be labeled as well. By default, volume labels are ignored.|
|-/ extensions||[Acorn only] overrides the extension list supplied by Unzip$Ext environment variable. During extraction, filename extensions that match one of the items in this extension list are swapped in front of the base name of the extracted file.|
|-:||[all but Acorn, VM/CMS, MVS, Tandem] allows to extract archive members into locations outside of the current " extraction root folder".
For security reasons, unzip nor-
mally removes "parent dir" path components ("../") from the names of extracted file. This safety feature (new for version 5.50) prevents unzip from accidentally writ-
ing files to "sensitive" areas outside the active extraction folder tree head. The -: option lets unzip switch back to its previous, more liberal behavior, to allow
exact extraction of (older) archives that used "../" components to create multiple directory trees at the level of the current extraction folder. This option does not
enable writing explicitly to the root directory ("/"). To achieve this, it is necessary to set the extraction target folder to root (e.g. -d / ). However, when the -:
option is specified, it is still possible to implicitly write to the root directory by specifying enough "../" path components within the zip archive. Use this option
with extreme caution.
Unzip the hope.zip archive into the current directory.