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note on entr

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`@@ -15,6 +15,7 @@ Handy list of oft-used Linux commands that I will never remember. Not intended t`
`15`	`15`	`- [fish](#fish)`
`16`	`16`	`- [wget](#wget)`
`17`	`17`	`- [Save current command to clipboard](#save-current-command-to-clipboard)`
	`18`	`+ - [entr](#entr)`
`18`	`19`	`- [Networking](#networking)`
`19`	`20`	`- [Port Monitoring](#port-monitoring)`
`20`	`21`	`- [SSH 101](#ssh-101)`
`@@ -139,6 +140,15 @@ wget -r -np -R "index.html" -nH -e robots=off --cut-dirs=X <download_URL>`
`139`	`140`
`140`	`141`	In `zsh`: <kbd>Ctrl</kbd> + <kbd>U</kbd> will cut the whole line (irrespective of your position). In `bash` and `fish`, it will cut backwards from your current position. <kbd>Ctrl</kbd> + <kbd>Y</kbd> will paste it back to the terminal.
`141`	`142`
	`143`	`+### entr`
	`144`	`+`
	`145`	`+Useful for watching file changes and running commands on files, e.g,`
	`146`	`+`
	`147`	+```bash
	`148`	`+ls *.md \| entr -c glow todo.md`
	`149`	+```
	`150`	`+`
	`151`	+will display the `todo.md` document in the terminal with `glow` and refresh every time the file is changed on disk.
`142`	`152`
`143`	`153`	`## Networking`
`144`	`154`

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