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It is documented in man page of gzip. You can use something like: zcat a.gz b.gz | gzip -c > c.txt.gz


To edit lots of files using regex, try using vidir: When editing a directory, each item in the directory will appear on its own numbered line. Delete lines to remove files from the directory, or edit filenames to rename files. You can also switch pairs of numbers to swap filenames.


Cong is correct. You are streaming the blocks off of disk uncompressed to a remote host. Your network interface, network, and your remote server are the limitation. First you need to get DD's performance up. Specifying a bs= parameter that aligns with the disks buffer memory will get the most performance from the disk. Say bs=32M for instance. This ...


As long as there aren't any files you want to remain gzip'd, use gzip -dr folder/


It is stored in the header of file. To see it, use file command. For example: $ file testfile.gz testfile.gz: gzip compressed data, from Unix, last modified: Sun Sep 15 14:22:19 2013, max compression Unfortunately there are only three possible values in the header: max speed (level 1), max compression (level 9) and "normal" (all other levels). But better ...

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