The range is from 0 to 9, with 0 being no compression at all. The higher the compression, the longer it takes to create the ZIP file. But then, for modestly sized ZIP files, the default compression level 6 is probably good enough anyway. The default compression level is 6. There is no need to provide the -6 option, but it will do no harm if you do.
With the selection of files and directories being archived here, the difference between no compression level 0 and the default compression level 6 is K. The difference between the default compression and the highest level of compression level 9 is only 4K. Adding passwords to ZIP files is easy.
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All of the files that are extracted have the owner set to the user who is extracting them. To have the files extracted in a specific directory, use the -d directory option, and provide the path to the directory you wish the archive to be extracted into. If a ZIP file has been created with a password, unzip will ask you for the password.
If you do not want to extract a particular file or group of files, use the -x exclude option.
A caution on using command-line zip for backups - Mac OS X Hints
Suppose you have extracted an archive but you have deleted a few of the extracted files by mistake. A quick fix for that would be to extract the files once again. But if you try to extract the ZIP file in the same directory as before, unzip will prompt you for a decision regarding overwriting the files.
It will expect one of the following responses. To force unzip to overwrite any existing files use the -o overwrite option. The most efficient way to replace the missing files would be to have unzip only extract any files in the archive that are not in the target directory. To do this, use the -n never overwrite option. It is often useful and instructive to see a list of the files inside a ZIP file before you extract it.
You can do this with the -l list archive option.
It is piped through less to make the output manageable. The output shows the directories and files within the ZIP file, their length and the time and date they were added to the archive. There are other ways to peek inside a ZIP file which give different types of information, as we shall see. You can quickly add a password to ZIP file using the zipcloak command. Pass the name of the ZIP file on the command line.
You will be prompted for a password.
You need to verify the password by entering it a second time. The zipdetails command will show you a lot of information regarding the ZIP file. The only sensible way to handle the amount of output this command can give is to pipe it through less.
Note that the information will include filenames even if the ZIP file is password protected. This type of information is stored within the ZIP file as meta-data and is not part of the encrypted data. The zipgrep command allows you to search within the files in a ZIP file. We can see that the files slang. We can also see that there are two copies of each of these files in different directories in the ZIP file. Say, you have article directory then you want article.
GouravChawla I'm achieving to get the right zip name, it's the default extraction path that's not correct, my version extracts to original folder name and utility's version extracts to archive's current name. Mark Adler Mark Adler No, the zip command does not have an option to operate from a different location. Sign up or log in Sign up using Google.
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7-zip GUI (Graphical User Interface)
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