Hello,
Im trying to extract a portion of a big file.
Using unique pattern /occurrence ,
(ex. loginname1,logoff and loginname2,logoff ),
I like to print the lines that contain the patterns and the lines between them.
Also, create a file for every login occurrence.
Thanks for everyone's... (1 Reply)
Hi All,
I have a file of the following format.
<?xml version='1.0' encoding='utf-8'?>
<tomcat-users>
<role rolename="tomcat"/>
<role rolename="role1"/>
<role rolename="manager"/>
<role rolename="admin"/>
<user username="tomcat" password="tomcat" roles="tomcat"/>
<user... (5 Replies)
Hi all,
I'm new in the unix environment. I'm having a challenge in extracting data from a flat file and convert it to a CSV file format or I should be able to open it with MS Excel.
The input data in my flat file looks like this:
AV00001001155000063637143326711145412082EM SITHOLE... (3 Replies)
Hi All,
I have a requirement where I have to search the file with some text say "Exception". This exception word can be repeated for more then 10 times.
Suppose the "Exception" word is repeated at line numbers say x=10, 50, 60, 120. Now I want to extract all the lines starting from x-5 to... (3 Replies)
Hello everybody,
Here is my problem : I cannot find a way to extract data from a particular file and more precisely I cannot extract the result of my awk script to an external file because I am currently working on HP-UX.
I would like a simple script (without awk) which asks for a date like... (4 Replies)
I need to extract some content of a file.
Example
file abc
vi abc
ooooooooo
bbbbbbbbb
vvv 1234 5
vvv 6789 3
xxxxxxxxxx
xxxxxxxxxx
i want to extract only the following content from file abc and store in another file say temp.
1234 5
6789 3
what should be my approach? (2 Replies)
Hi Freinds,
I have a file1.txt in the following format
File1.txt
I want to get 2 files from the above file filextra.txt should have the lines which are ending with "<" and remaining lines in the filecompare.txt file.
Please help. (3 Replies)
FILE_ID extraction from file name and save it in CSV file after looping through each folders
My files are located in UNIX Server, i want to extract file_id and file_name from each file .and save it in a CSV file. How do I do that?
I have folders in unix environment, directory structure is... (15 Replies)
Hello,
I'm attempting to extract 13 digit numbers beginning with 978 from a data file with the following command:
awk '{ for(i=1;i<=NF;i++) if($i ~ /^978/) print $i; }' datafile > outfile
This typically works. However, the new data file is an .xml file, and this command is no longer working... (6 Replies)
Discussion started by: palex
6 Replies
LEARN ABOUT ULTRIX
zcat
compress(1) General Commands Manual compress(1)Name
compress, uncompress, zcat - compress and expand data
Syntax
compress [ -f ] [ -v ] [ -c ] [ -b bits ] [ name ... ]
uncompress [ -f ] [ -v ] [ -c ] [ name ... ]
zcat [ name ... ]
Description
The command reduces the size of the named files using adaptive Lempel-Ziv coding. Whenever possible, each file is replaced by one
with the extension .Z, while keeping the same ownership modes, access, and modification times. If no files are specified, the
standard input is compressed to the standard output. Compressed files can be restored to their original form using or
The -f option will force compression of name, even if it does not actually shrink name, or if the corresponding name .Z file
already exists. If the -f option is omitted, the user is asked whether an existing name.Z file should be overwritten (unless is
run in the background under
The -c (cat) option makes compress/uncompress write to the standard output without changing any files. Neither -c nor alter files.
The command uses the modified Lempel-Ziv algorithm. Common substrings in the file are first replaced by 9-bit codes 257 and up.
When code 512 is reached, the algorithm switches to 10-bit codes and continues to use more bits until the limit specified by the -b
flag is reached (default 16). The bits must be between 9 and 16. The default can be changed in the source to allow to be run on a
smaller machine.
After the bits limit is attained, periodically checks the compression ratio. If the ratio is increasing, continues to use the
existing code dictionary. However, if the compression ratio decreases, discards the table of substrings and rebuilds it from
scratch. This allows the algorithm to adapt to the next block of the file.
Note that the -b flag is omitted for since the bits parameter specified during compression is encoded within the output along with
a number that ensures that neither decompression of random data nor recompression of compressed data is attempted.
How much each file is compressed depends on the size of the input, the number of bits per code, and the distribution of common sub-
strings. Typically, text such as source code or English is reduced by 50-60%. Compression is generally much better than that
achieved by Huffman coding or adaptive Huffman coding, and takes less time to compute.
The -v option displays the percent reduction of each file.
If an error occurs, exit status is 1. However, if the last file was not compressed because it became larger, the status is 2.
Otherwise, the status is 0.
Options-f Forces compression of name.
-c Makes compress/uncompress write to the standard output.
-b Specifies the allowable bits limit. The default is 16.
-v Displays the percent reduction of each file.
Diagnostics
Usage: compress [-fvc] [-b maxbits] [file ...]
Invalid options were specified on the command line.
Missing maxbits
Maxbits must follow -b.
file: not in compressed format
The file specified to uncompress has not been compressed.
file: compressed with xx bits, can only handle yy bits
The file was compressed by a program that could deal with more bits than the compress code on this machine. Recompress the file
with smaller bits.
file: already has .Z suffix -- no change
The file is assumed to be compressed already. Rename the file and try again.
file already exists; do you wish to overwrite (y or n)?
Type y if you want the output file to be replaced; type n if you do not.
uncompress: corrupt input
A SIGSEGV violation was detected which usually means that the input file is corrupted.
Compression: xx.xx%
Percent of the input saved by compression. (For the -v option only.)
-- not a regular file: unchanged
If the input file is not a regular file (for example, a directory), it remains unchanged.
-- has xx other links: unchanged
The input file has links; it is left unchanged. See for more information.
-- file unchanged
No savings is achieved by compression. The input remains unchanged.
Restrictions
Although compressed files are compatible between machines with large memory, -b12 should be used for file transfer to architectures
with a small process data space (64KB or less).
RISC compress(1)