The 'cat' is to make sure it's not doing anything sneaky like running fstat on /dev/stdin.
---------- Post updated at 09:46 AM ---------- Previous update was at 09:14 AM ----------
yet again, working on streams:
The limit seems to be that the compressed file has to be a file, not a stream, for the final size to be known. Maybe it has to seek to the end, impossible in a stream.
Is there a way you can tell if a file
is still zipped or it's unzipped
I have a file called ssss.zip and I would like to know if this file is still zipped or if it's unzipped?
I'm on IBM AIX/RS6000 (3 Replies)
I have a script that grabs files from directory , zips and moves them somewhere else. It works fine except the case when files it grabs are already zipped. Then it trys to zip it again which does not make sence.
How can I check before zipping if file is already zipped?
thanks in advance (3 Replies)
Dear all,
I would like to ask how i can read a zipped file (file.gz) without actually unzipping it?
i think there is a way to do so but i can't remember it..
can anyone help?
thanks in advance.. (1 Reply)
#!/bin/sh
##########################################################################################################
#This script is being used for AOK application for cleaning up the .out files and zip it under logs directory.
# IBM
# Created
#For pdocap201/pdoca202 .out files for AOK
#1.... (0 Replies)
SunOS xxxxxx 5.10 Generic_142900-15 sun4v sparc SUNW,T5240
We receive files that are sometimes zipped, but the file may not have the .gz or other extention that would indicated that the file is zipped. Is there a unix "test" command that I could use or something similar?
Thanks in advance (7 Replies)
Hi Unix gurus,
Maybe it is too much to ask for but please take a moment and help me out. A very humble request to you gurus. I'm new to Unix and I have started learning Unix. I have this project which is way to advanced for me.
File format: CSV file
File has four columns with no header... (8 Replies)
Hi,
I don't have enough space on my Unix Box. So, I can't unzip the file and check the size of the file. So, I need to know, Is there any command, to check, how much the unzipped file takes after unzipping. Thanks in Advance. (4 Replies)
Hi,
I am trying to find out the original file size of an encrypted file in SunOS.
The file was decrypted with gpg command.
I want to know the size of the orginal file without decrypting it. I am using the below command, but it is not working for big files(more than 1 GB).
gpg --passphrase... (4 Replies)
Discussion started by: vsachan
4 Replies
LEARN ABOUT NETBSD
gzip
GZIP(1) BSD General Commands Manual GZIP(1)NAME
gzip -- compression/decompression tool using Lempel-Ziv coding (LZ77)
SYNOPSIS
gzip [-cdfhlNnqrtVv] [-S suffix] file [file [...]]
gunzip [-cfhNqrtVv] [-S suffix] file [file [...]]
zcat [-fhV] file [file [...]]
DESCRIPTION
The gzip program compresses and decompresses files using Lempel-Ziv coding (LZ77). If no files are specified, gzip will compress from stan-
dard input, or decompress to standard output. When in compression mode, each file will be replaced with another file with the suffix, set by
the -S suffix option, added, if possible. In decompression mode, each file will be checked for existence, as will the file with the suffix
added.
If invoked as gunzip then the -d option is enabled. If invoked as zcat or gzcat then both the -c and -d options are enabled.
This version of gzip is also capable of decompressing files compressed using compress(1) or bzip2(1).
OPTIONS
The following options are available:
-1, --fast
-2
-3
-4
-5
-6
-7
-8
-9, --best These options change the compression level used, with the -1 option being the fastest, with less compression, and the -9
option being the slowest, with optimal compression. The default compression level is 6.
-c, --stdout, --to-stdout
This option specifies that output will go to the standard output stream, leaving files intact.
-d, --decompress, --uncompress
This option selects decompression rather than compression.
-f, --force This option turns on force mode. This allows files with multiple links, overwriting of pre-existing files, reading from or
writing to a terminal, and when combined with the -c option, allowing non-compressed data to pass through unchanged.
-h, --help This option prints a usage summary and exits.
-l, --list This option displays information about the file's compressed and uncompressed size, ratio, uncompressed name. With the -v
option, it also displays the compression method, CRC, date and time embedded in the file.
-N, --name This option causes the stored filename in the input file to be used as the output file.
-n, --no-name This option stops the filename and timestamp from being stored in the output file.
-q, --quiet With this option, no warnings or errors are printed.
-r, --recursive This option is used to gzip the files in a directory tree individually, using the fts(3) library.
-S suffix, --suffix suffix
This option changes the default suffix from .gz to suffix.
-t, --test This option will test compressed files for integrity.
-V, --version This option prints the version of the gzip program.
-v, --verbose This option turns on verbose mode, which prints the compression ratio for each file compressed.
ENVIRONMENT
If the environment variable GZIP is set, it is parsed as a white-space separated list of options handled before any options on the command
line. Options on the command line will override anything in GZIP.
SEE ALSO bzip2(1), compress(1), xz(1), fts(3), zlib(3)HISTORY
The gzip program was originally written by Jean-loup Gailly, licensed under the GNU Public Licence. Matthew R. Green wrote a simple front
end for NetBSD 1.3 distribution media, based on the freely re-distributable zlib library. It was enhanced to be mostly feature-compatible
with the original GNU gzip program for NetBSD 2.0.
This manual documents NetBSD gzip version 20040427.
AUTHORS
This implementation of gzip was written by Matthew R. Green <mrg@eterna.com.au>.
BSD June 18, 2011 BSD