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Problem updating zip file?

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Join Date: Oct 2006

Posts: 179

Reputation: HLA91 is an unknown quantity at this point

Solved Threads: 2

HLA91

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Junior Poster

Problem updating zip file?

Jul 13th, 2009

Hi all

I just thought about backing up my home directory to a zip file so I used

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zip backup-13-jul-09 .

Then I read about the argument

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-u

so I found a file called readme.txt in my home directory opened it and added "Hello World" to the bottom line then performed the

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zip -u backup-13-jul-09 .

command but it didn't update the readme.txt file to include "Hello World" on the last line.

Its probably something simple but can someone help me out please?

Many thanks

HLA91

You know your a geek, if you introduce your wife as "mylady@home.wife"

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Join Date: Feb 2009

Posts: 3,187

Reputation: sknake has much to be proud of

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sknake

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.NET Enthusiast

Re: Problem updating zip file?

Jul 13th, 2009

I dont think your command worked:

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 bash Syntax (Toggle Plain Text) 
sk@sk:~/zip$ zip backup .
 
zip error: Nothing to do! (backup.zip)
sk@sk:~/zip$ zip backup .

zip error: Nothing to do! (backup.zip)

What I did to create the zip archive:

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 bash Syntax (Toggle Plain Text) 
sk@sk:~/zip$ ls
readme.txt
sk@sk:~/zip$ tail -1 readme.txt
test123
sk@sk:~/zip$ zip -r backup ../zip
  adding: ../zip/ (stored 0%)
  adding: ../zip/readme.txt (stored 0%)
sk@sk:~/zip$ ls
readme.txt
sk@sk:~/zip$ tail -1 readme.txt
test123
sk@sk:~/zip$ zip -r backup ../zip
  adding: ../zip/ (stored 0%)
  adding: ../zip/readme.txt (stored 0%)

Now appending text an updating:

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 bash Syntax (Toggle Plain Text) 
sk@sk:~/zip$ cp backup.zip .backup.zip
sk@sk:~/zip$ tail -2 readme.txt
test123
sk@sk:~/zip$ echo "hello, world" >> readme.txt
sk@sk:~/zip$ zip -u backup *
  adding: readme.txt (stored 0%)
sk@sk:~/zip$ diff .backup.zip backup.zip
Binary files .backup.zip and backup.zip differ
sk@sk:~/zip$ unzip backup.zip
Archive:  backup.zip
warning:  skipped "../" path component(s) in ../zip/
   creating: zip/
warning:  skipped "../" path component(s) in ../zip/readme.txt
 extracting: zip/readme.txt
replace readme.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: r
new name: readme2.txt
 extracting: readme2.txt
sk@sk:~/zip$ tail -2 readme2.txt
test123
hello, world
sk@sk:~/zip$ cp backup.zip .backup.zip
sk@sk:~/zip$ tail -2 readme.txt
test123
sk@sk:~/zip$ echo "hello, world" >> readme.txt
sk@sk:~/zip$ zip -u backup *
  adding: readme.txt (stored 0%)
sk@sk:~/zip$ diff .backup.zip backup.zip
Binary files .backup.zip and backup.zip differ
sk@sk:~/zip$ unzip backup.zip
Archive:  backup.zip
warning:  skipped "../" path component(s) in ../zip/
   creating: zip/
warning:  skipped "../" path component(s) in ../zip/readme.txt
 extracting: zip/readme.txt
replace readme.txt? [y]es, [n]o, [A]ll, [N]one, [r]ename: r
new name: readme2.txt
 extracting: readme2.txt
sk@sk:~/zip$ tail -2 readme2.txt
test123
hello, world