57 lines
1.9 KiB
Markdown
57 lines
1.9 KiB
Markdown
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# The `gunzip` command
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The `gunzip` command is an antonym command of [`gzip` command](015-the-gzip-command.md). In other words, it decompresses files deflated by the `gzip` command.
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`gunzip` takes a list of files on its command line and replaces each file whose name ends with _.gz_, _-gz_, _.z_, _-z_, or *\_z* (ignoring case) and which begins with the correct magic number with an uncompressed file without the original extension. `gunzip` also recognizes the special extensions *.tgz* and *.taz* as shorthands for *.tar.gz* and *.tar.Z* respectively.
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### Examples:
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1. Uncompress a file
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```
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gunzip filename.gz
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```
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2. Recursively uncompress content inside a directory, that match extension (suffix) compressed formats accepted by `gunzip`:
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```
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gunzip -r directory_name/
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```
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3. Uncompress all files in the current/working directory whose suffix match *.tgz*:
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```
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gunzip -S .tgz *
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```
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4. List compressed and uncompressed sizes, compression ratio and uncompressed name of input compressed file/s:
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```
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gunzip -l file_1 file_2
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```
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### Syntax:
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```
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gunzip [ -acfhklLnNrtvV ] [-S suffix] [ name ... ]
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```
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### Video tutorial about using gzip, gunzip and tar commands:
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[This video](https://www.youtube.com/watch?v=OBtG8zfVwuI) shows how to compress and decompress in a Unix shell. It uses `gunzip` as decompression command.
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### Additional Flags and their Functionalities:
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|**Short Flag**|**Long Flag**|**Description**|
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|:---|:---|:---|
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|-c|--stdout|write on standard output, keep original files unchanged|
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|-h|--help|give help information|
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|-k|--keep|keep (don't delete) input files|
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|-l|--list|list compressed file contents|
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|-q|--quiet|suppress all warnings|
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|-r|--recursive|operate recursively on directories|
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|-S|--suffix=SUF|use suffix SUF on compressed files|
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||--synchronous|synchronous output (safer if system crashes, but slower)|
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|-t|--test|test compressed file integrity|
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|-v|--verbose|verbose mode|
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|-V|--version|display version number|
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