58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
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# The `bzip2` command
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The `bzip2` command lets you compress and decompress the files i.e. it helps in binding the files into a single file which takes less storage space as the original file use to take.
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### Syntax:
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```
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bzip2 [OPTIONS] filenames ...
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```
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#### Note : Each file is replaced by a compressed version of itself, with the name original name of the file followed by extension bz2.
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### Options and their Functionalities:
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|**Option** |**Alias** |**Description** |
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|:---|:---|:---|
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|`-d`|`--decompress`|to decompress compressed file|
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|`-f`|`--force`|to force overwrite an existing output file|
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|`-h`|`--help`|to display the help message and exit|
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|`-k`|`--keep`|to enable file compression, doesn't deletes the original input file|
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|`-L`|`--license`|to display the license terms and conditions|
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|`-q`|`--quiet`|to suppress non-essential warning messages|
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|`-t`|`--test`|to check integrity of the specified .bz2 file, but don't want to decompress them|
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|`-v`|`--erbose`|to display details for each compression operation|
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|`-V`|`--version`|to display the software version|
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|`-z`|`--compress`|to enable file compression, but deletes the original input file|
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> #### By default, when bzip2 compresses a file, it deletes the original (or input) file. However, if you don't want that to happen, use the -k command line option.
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### Examples:
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1. To force compression:
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```
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bzip2 -z input.txt
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```
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**Note: This option deletes the original file also**
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2. To force compression and also retain original input file:
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```
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bzip2 -k input.txt
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```
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3. To force decompression:
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```
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bzip2 -d input.txt.bz2
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```
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4. To test integrity of compressed file:
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```
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bzip2 -t input.txt.bz2
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```
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5. To show the compression ratio for each file processed:
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```
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bzip2 -v input.txt
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```
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