Added many more pages
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#Commands
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##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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| Useful Flags | Function |
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| ------------- |:-------------|
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| -i | in-place, writes the changes to the file |
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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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###rev
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2
docs/examples/grep.md
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2
docs/examples/grep.md
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#Grep examples
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59
docs/examples/regexmatch.md
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docs/examples/regexmatch.md
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#Regex examples
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##Match an IP address
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`\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}`
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If we use this expression on the following using grep to search the file
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`grep -oP '\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}' log.txt'`
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```
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103.252.153.201
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127.0.0.1 - - [30/Dec/2018 22:43:01] "GET / HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.169
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127.0.0.1 - - [31/Dec/2018 09:17:47] "GET / HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.173
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127.0.0.1 - - [31/Dec/2018 09:17:48] "GET /favicon.ico HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:43] "GET / HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:45] "GET /favicon.ico HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:51] "POST / HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 01:58:51] "GET /favicon.ico HTTP/1.0" 200 -
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112.140.176.2
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127.0.0.1 - - [01/Jan/2019 02:13:07] "GET /EviXDWpXvH HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.171
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127.0.0.1 - - [02/Jan/2019 10:32:17] "GET / HTTP/1.0" 200 -
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210.49.93.254, 66.102.6.173
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127.0.0.1 - - [02/Jan/2019 10:32:18] "GET /favicon.ico HTTP/1.0" 200 -
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```
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The output will be a list of IP addresses in the file that looks like
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```
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103.252.153.201
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127.0.0.1
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210.49.93.254
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66.102.6.169
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127.0.0.1
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210.49.93.254
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66.102.6.173
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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112.140.176.2
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127.0.0.1
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210.49.93.254
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66.102.6.171
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127.0.0.1
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210.49.93.254
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66.102.6.173
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127.0.0.1
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```
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docs/regex.md
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docs/regex.md
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#Regex
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I am by no means an expert when it comes to regex, this document will propbably have some inaccuracies in it but hey it is what it is :)
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##What is regex?
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Regex is shorthand for regular expressions, it is a system for pattern matching in text, when combined with commands it can be used for quite a lot of things
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##Useful regex patterns
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* **.** \- Matches any char
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* **^** \- Matches at the start of a line
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* **$** \- Matches at the end of a line
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* **?** \- Matches once or none
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* **+** \- Matches once or more
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* **\*** \- Matches zero or more times
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* **\d** \- Match any decimal (0-9)
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* **\b** \- Defines a word boundary
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* **{x}** \- Repeat exactly x times
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* **{x, y}** \- Repeat pattern x to y times
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##Regex logic
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* **|** \- Logical OR, allows pattern1 OR pattern2 to match
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* **(x|y)** \- Matches a group of patterns
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I have made a few examples [here](/examples/regexmatch)
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@ -3,4 +3,5 @@ nav:
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- Home: index.md
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- Commands: commands.md
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- Connections: connections.md
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- Regex: regex.md
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theme: readthedocs
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