Basic command line code used by developer.

Basic command and description

grep
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Grep search a specific patten in each file

$ grep "some string" file

Search a string in a specific. 


$ grep -i "REact" file
By using -i, grep Search REact case insensitivley 

$ grep -c "react" index.js
Count number of line that match strings in the file

ls
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List files in the directory of path, if it is file name, then it shows the information about the file 


pwd
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Shows the fullsystem path of the current working directory



cat
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Used to read the content of a file.

$ echo "some text"
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Used to echo the line of text followed by the command.


$ touch somefile
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Create a file without any content.


$ mkdir some-directory
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Used to create a new empty directory.


$ rm someFile
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Remove a file from the directory.


$ rm -rf some-directory
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Remove a directory unconditionally doesn't consider directory has content inside or not.


$ rmdir some-directory
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Remove directory if there is no content inside.


$ tail somefile
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Read the last part of a file.

$ wget someurl
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$ find path -name filename
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find a file name inside a path specified in the command.

$ find . -name "*.js"
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Search smae type of file (here .js) in the path

$ mv somefile /to/some/other/path
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Move file from on directory to another directoty.