60 lines
2.1 KiB
Markdown
60 lines
2.1 KiB
Markdown
# Commands
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## Manipulating files
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Commands that can be used for reading and manipulating files
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#### tail
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`tail` by default reads the last 5 lines of the input file and then exits
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| Useful Flags | Function |
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| ------------- |:-------------|
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| -n *x* | Returns the last x lines of a file |
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| -f | Follows the end of the file, so any new data will be printed out to the screen |
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#### head
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`head` by default reads the first 5 lines of the input file and then exits
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| Useful Flags | Function |
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| ------------- |:-------------|
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| -n *x* | Returns the first x lines of a file |
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#### awk
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`awk` is used to extract, layout and modify data using the command line (It is way more then this but its all I use it for)
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#### sed
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`sed` is the '**S**tream **ED**itor' you can use to to modify files via commands and scripts using patterns, an [example](examples/seddnszone.md) can be seen here
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| Useful Flags | Function |
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| ------------- |:-------------|
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| -i | In-place, writes the changes to the file |
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| -f | Use a script file instead of reading the expression from STDIN |
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#### grep
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`grep` is used to match text in a file,
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| Useful Flags | Function |
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| ------------- |:-------------|
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| -o | Returns only the matched data (Useless without regex really) |
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| -E | Allows extended regex to be used in the search, [regex info](/regex)|
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| -P | Allows the use of Perl regex, this uses a different syntax to -E |
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| -i | Makes the search case insensitive |
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| -r | Searches files recursively (i.e if you have quite a few files and folders it will search through all of them) |
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| -l | Returns the filename where the data was matched instead of the matched data |
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Some examples of grep usage can be found [here](/examples/grep)
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#### lsof
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`lsof` is a command that will show you what processes have specified file open currently you can see an example [here](/examples/lsof)
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## Manipulating the standard input
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These commands can be used to manipulate data in the standard input
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#### rev |