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Update Unix lecture with small notes and fixes

This commit fixes a typo, makes sure the `awk` example works on state, and gives the core basics of regular expressions using `sed` These changes were done to make the lecture more accurate and with notes for future reference.

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- unix_outline.org

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Lines changed: 5 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -629,14 +629,14 @@ columns/fields in the file, which may be useful in manipulating the file.`
`629`	`629`	`Now that we have the general syntax, let's try out some ~awk~ commands.`
`630`	`630`
`631`	`631`	`#+BEGIN_SRC sh`
`632`		`- # Reminder rof what the -l flag does`
	`632`	`+ # Reminder of what the -l flag does`
`633`	`633`	`ls -l`
`634`	`634`	`#+END_SRC`
`635`	`635`
`636`	`636`	`#+BEGIN_SRC sh`
`637`	`637`	`# Examples of awk and potential actions`
`638`		`- ls -l \| awk '{ print 6ドル " " $10 }'`
`639`		`- ls -l \| awk '{ print $6 * 2 }'`
	`638`	`+ ls -l \| awk '{ print 6ドル " " $9 }'`
	`639`	`+ ls -l \| awk '{ print $7 * 2 }'`
`640`	`640`	`#+END_SRC`
`641`	`641`
`642`	`642`	`*** Resources and more`
`@@ -657,6 +657,8 @@ A simple use of ~sed~ is for replacing text.`
`657`	`657`
`658`	`658`	`#+BEGIN_SRC sh`
`659`	`659`	`# Use sed to replace day and night`
	`660`	`+ # Basic regular expressions:`
	`661`	`+ # s/<find this...>/<...and replace with this>/`
`660`	`662`	`echo Sunday \| sed 's/day/night/'`
`661`	`663`	`#+END_SRC`
`662`	`664`

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Commit 7f8f8e6

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`‎notes/unix_outline.org‎`

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