gzip produces different output from the same input Post: 302433337

Sponsored Content

Top Forums UNIX for Dummies Questions & Answers gzip produces different output from the same input Post 302433337 by chebarbudo on Tuesday 29th of June 2010 08:59:20 AM

06-29-2010

Registered User

Thanks again pludi
My problem is that I thought that copying a file actually kept the modification time wich is wrong.
I ran the same test with option -p to cp command and the conclusion is obvious:

Code:

santiago:~$ rm -f copy*
santiago:~$ cp -p original copy
santiago:~$ gzip copy
santiago:~$ md5sum copy.gz
8dab7a05d099f445698b04f0d1e59873  copy.gz
santiago:~$ file copy.gz
copy.gz: gzip compressed data, was "copy", from Unix, last modified: Tue Jun 29 14:48:31 2010
santiago:~$
santiago:~$ rm -f copy*
santiago:~$ cp -p original copy
santiago:~$ gzip copy
santiago:~$ md5sum copy.gz
8dab7a05d099f445698b04f0d1e59873  copy.gz
santiago:~$ file copy.gz
copy.gz: gzip compressed data, was "copy", from Unix, last modified: Tue Jun 29 14:48:31 2010

chebarbudo

View Public Profile for chebarbudo

Find all posts by chebarbudo

10 More Discussions You Might Find Interesting

1. Linux

vgscan produces no output using file descriptors on Oracle Enterprise Linux.

I wrote a simple program which will create a child process to execute a command and the output will be redirected to the file. Please have a look at the following code -> #include <stdio.h> #include <stdlib.h> #include <sys/stat.h> #include <fcntl.h> void execute(char **argv) { ...

2. Shell Programming and Scripting

Dynamic output file generation using a input text file with predefined output format

Hi, I have two files , one file with data file with attributes that need to be sent to another file to generate a predefined format. Example: File.txt AP|{SSHA}VEEg42CNCghUnGhCVg== APVG3|{SSHA}XK|"password" AP3|{SSHA}XK|"This is test" .... etc --------- test.sh has...

3. Shell Programming and Scripting

Using piped input to gzip

Can anyone tell me why does'nt the following command work? find /gfp1/home/arijit -name "*.sas7bdat" | gzip I am trying to compress all files with extension sas7bdat with gzip. It gives error message gzip: compressed data not written to a terminal. Use -f to force compression....

4. UNIX for Advanced & Expert Users

gzip vs pipe gzip: produce different file size

Hi All, I have a random test file: test.txt, size: 146 $ ll test.txt $ 146 test.txt Take 1: $ cat test.txt | gzip > test.txt.gz $ ll test.txt.gz $ 124 test.txt.gz Take 2: $ gzip test.txt $ ll test.txt.gz $ 133 test.txt.gz As you can see, gzipping a file and piping into gzip...

5. Shell Programming and Scripting

Redirect output to tar.gzip

I would like to make a listing of files in a large directory and output it to tar.gz. Is it possible to do this in one command? For example; I would like the text output from this command to be outputted to a directory.tar.gz file. ls -al -R /bigdir Is it possible to do it in memory...

6. UNIX for Dummies Questions & Answers

linux sort command produces strange output

cat a .a ba .b bb .c bc sort a .a .b ba bb bc .c NOTE: .a and .b appears before ba and bb, where as .c appears after bc. In general

7. Shell Programming and Scripting

Need a shell script to compare two directories and produces the output

Hi, I am using solaris OS 10 and Bash shell.I need a script which will compare the two directories and produces the output. Step 1: In detail say suppoose I have machine one and have a directory dir1. Script should iterate through the directories and subdirectories inside and produce the output...

8. AIX

Gzip status output is not redirecting.

Dear all I am facing issue in one part of my script. in this part i am trying to zip the files but want the status to be redirected to a text file YAMVASSRV02_vas> YAMVASSRV02_vas> cat final_col.sh gzip -cv /data01/oracle/oradata/vas/control/control01.ctl > ...

9. Shell Programming and Scripting

awk runs and produces output but with error

When I run the awk below, I get an error message awk -v OFS='\t' '$(NF-1)=="Benign" || ($(NF-2) OFS $(NF-1))=="Likely Benign" {$(NF)=$(NF-2) OFS $(NF-1)} {print $0 }' input awk: cmd. line:1: (FILENAME=VUS FNR=8) fatal: attempt to access field -1 input Chr Start End Ref ...

10. Shell Programming and Scripting

Printing the output of a gzip command intact

how can i get the printf command or the echo command to print the data that are inbetween the first and the last quotes? #!/bin/sh printf '%s\n' "^_<8b>^H^@U<8c>MX^@^C�=�z�H<97>��^Te�n<8c>�b_<9d><9f>dXd<9b>^N^F7<82>8q��'^K^Y^T<83>D<90>�M^L�^H�^Fs5w3�|s5/��bS%�<84>^DBH...

10 More Discussions You Might Find Interesting

1. Linux

vgscan produces no output using file descriptors on Oracle Enterprise Linux.

Discussion started by: sandiworld

2. Shell Programming and Scripting

Dynamic output file generation using a input text file with predefined output format

Discussion started by: hudson03051nh

3. Shell Programming and Scripting

Using piped input to gzip

Discussion started by: bs0409

4. UNIX for Advanced & Expert Users

gzip vs pipe gzip: produce different file size

Discussion started by: hanfresco

5. Shell Programming and Scripting

Redirect output to tar.gzip

Discussion started by: lewk

6. UNIX for Dummies Questions & Answers

linux sort command produces strange output

Discussion started by: ajb

7. Shell Programming and Scripting

Need a shell script to compare two directories and produces the output

Discussion started by: muraliinfy04

8. AIX

Gzip status output is not redirecting.

Discussion started by: javeedkaleem

9. Shell Programming and Scripting

awk runs and produces output but with error

Discussion started by: cmccabe

10. Shell Programming and Scripting

Printing the output of a gzip command intact

Discussion started by: SkySmart