vim

Vim (Vi IMproved), a command-line text editor, provides several modes for different kinds of text manipulation.

Pressing `i` enters insert mode. `<Esc>` enters normal mode, which enables the use of Vim commands.

• Open a file:

vim {path/to/file}

• Open a file at a specified line number:

vim +{line_number} {path/to/file}

• View Vim's help manual:

:help

• Save and Quit:

:wq

• Undo the last operation:

u

• Search for a pattern in the file (press `n`/`N` to go to next/previous match):

/{search_pattern}

• Perform a regular expression substitution in the whole file:

:%s/{regular_expression}/{replacement}/g

• Display the line numbers:

:set nu

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