The utility p7zip can deal with many forms of compression:
For example:
running 7z on this file with "list" directive produces:
More recent versions, around 9.x, are available in repositories (e.g Debian, SuSE, CentOS, Mac OS X ("brew"), etc).
I don't know if every compression format includes meta-data that can be extracted without uncompressing the file, but p7zip seems worth a try.
The run was in the environment:
Best wishes ... cheers, drl
In a shell script I would like to use a compressed file name, i.e. with suffix of .Z, as a file input $1. After the file in uncompressed, I would like to use the file name without the .Z . How do I do this?
Thank you. (8 Replies)
Is there a way I can check if a file is comppressed or not? (Be it tar/gzip or compress). trying to write a generic housekeeping scrit that will delete files over 6 months old and compress any uncompressed files if less than 6 months old. But not sure if there is a clever way to check except for... (4 Replies)
I want to read a directory full of compressed files and move the file to another directory if it meets certain criteria. I only want to look at the first line of the compressed file and if I find the string, do the move. I am currently using the following:
zgrep -R -L... (1 Reply)
How we can view the content of the file,if it compressed (or) Zipped ,without uncompress ?
I have one file ,i compressed it,without uncompressing the file.Is it possible to see the content of the file? (2 Replies)
Hi,
I'm trying to find all tar and compressed files (say gzip). I'm having to assume that the tar and gzip files may or may not have the correct extension (.tar .gz .tgz etc).
Any help appreciated (2 Replies)
Hi
i have a filename.tar.bz2 and i have to parse it with a tool that doesn't support compressed files.
I have to do it for many big files, so i can't decompress and then process. I'd like to do something like:
tar -jxvf namefile.tar.bz2 | parsing_tool
i mean analyze it directly,... (4 Replies)
i have a file 4d7a94d0.bbb.1292
when i do
file 4d7a94d0.bbb.1292
the ouput is below
4d7a94d0.bbb.1292: gzip compressed data - deflate method
and i run this command
gunzip -c 4d7a94d0.bbb.1292 | awk '{gsub("\"","")}/I_ACCOUNT_ID/{print $2}' RS=":|;" FS=","
i get... (3 Replies)
i need to backup a directory from one partition to another and and compress that directory after backing up, so i need to predict the compressed size of the directory with out actually compressing it, to check whether the space is available in the destination partition to accommodate the zipped... (2 Replies)
Hello all,
I would like to add a file to a compressed (gzip) tarfile. Normally it won't be a Problem, if I would do it in several steps. But I do not want to have unnecessary files.
So, in words:
unzip the tarfile
add a new file
zip the tarfile
What I tried:
... (3 Replies)
Discussion started by: API
3 Replies
LEARN ABOUT X11R4
7zr
7zr(1) General Commands Manual 7zr(1)NAME
7zr - A file archiver with highest compression ratio
SYNOPSIS
7zr [adeltux] [-] [SWITCH] <ARCHIVE_NAME> <ARGUMENTS>...
DESCRIPTION
7-Zip is a file archiver with the highest compression ratio. The program supports 7z (that implements LZMA compression algorithm), LZMA2,
XZ, ZIP, Zip64, CAB, RAR (if the non-free p7zip-rar package is installed), ARJ, GZIP, BZIP2, TAR, CPIO, RPM, ISO, most filesystem images
and DEB formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format.
7zr is a stand-alone executable. 7zr handles less archive formats than 7z. 7zr is a "light-version" of 7za that only handles 7z archives.
FUNCTION LETTERS
a Add
d Delete
e Extract
l List
t Test
u Update
x eXtract with full paths
SWITCHES
-ai[r[-|0]]{@listfile|!wildcard}
Include archives
-ax[r[-|0]]{@listfile|!wildcard}
eXclude archives
-bd Disable percentage indicator
-i[r[-|0]]{@listfile|!wildcard}
Include filenames
-l don't store symlinks; store the files/directories they point to (CAUTION : the scanning stage can never end because of recursive
symlinks like 'ln -s .. ldir')
-m{Parameters}
Set Compression Method (see /usr/share/doc/p7zip/DOCS/MANUAL/switches/method.htm for a list of methods)
-mhe=on|off
7z format only : enables or disables archive header encryption (Default : off)
-o{Directory}
Set Output directory
-p{Password}
Set Password
-r[-|0]
Recurse subdirectories (CAUTION: this flag does not do what you think, avoid using it)
-sfx[{name}]
Create SFX archive
-si Read data from StdIn (eg: tar cf - directory | 7zr a -si directory.tar.7z)
-so Write data to StdOut (eg: 7zr x -so directory.tar.7z | tar xf -)
-slt Sets technical mode for l (list) command
-v{Size}[b|k|m|g]
Create volumes
-u[-][p#][q#][r#][x#][y#][z#][!newArchiveName]
Update options
-w[path]
Set Working directory
-x[r[-|0]]]{@listfile|!wildcard}
Exclude filenames
-y Assume Yes on all queries
DIAGNOSTICS
7-Zip returns the following exit codes:
0 Normal (no errors or warnings detected)
1 Warning (Non fatal error(s)). For example, some files cannot be read during compressing. So they were not compressed
2 Fatal error
7 Bad command line parameters
8 Not enough memory for operation
255 User stopped the process with control-C (or similar)
Backup and limitations
DO NOT USE the 7-zip format for backup purpose on Linux/Unix because :
- 7-zip does not store the owner/group of the file.
On Linux/Unix, in order to backup directories you must use tar :
- to backup a directory : tar cf - directory | 7zr a -si directory.tar.7z
- to restore your backup : 7zr x -so directory.tar.7z | tar xf -
If you want to send files and directories (not the owner of file) to others Unix/MacOS/Windows users, you can use the 7-zip format.
example : 7zr a directory.7z directory
Do not use "-r" because this flag does not do what you think.
Do not use directory/* because of ".*" files (example : "directory/*" does not match "directory/.profile")
EXAMPLE 1
7zr a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on archive.7z dir1
adds all files from directory "dir1" to archive archive.7z using "ultra settings"
-t7z 7z archive
-m0=lzma
lzma method
-mx=9 level of compression = 9 (Ultra)
-mfb=64
number of fast bytes for LZMA = 64
-md=32m
dictionary size = 32 megabytes
-ms=on solid archive = on
EXAMPLE 2
7zr a -sfx archive.exe dir1
add all files from directory "dir1" to SFX archive archive.exe (Remark : SFX archive MUST end with ".exe")
EXAMPLE 3
7zr a -mhe=on -pmy_password archive.7z a_directory
add all files from directory "a_directory" to the archive "archive.7z" (with data and header archive encryption on)
SEE ALSO 7z(1), 7za(1), bzip2(1), gzip(1), zip(1)HTML Documentation
/usr/share/doc/p7zip/DOCS/MANUAL/index.htm
AUTHOR
Written for Debian by Mohammed Adnene Trojette.
Mohammed Adnene Trojette September 1 2006 7zr(1)