Differences

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--- notes:unix:spring2024:classnotes [2024/03/22 16:42] – [UNIX class notes] cgrant9
+++ notes:unix:spring2024:classnotes [2024/03/28 09:52] – [Thursday] cgrant9
@@ Line 1: / Line 1: @@
 ======UNIX class notes======
-[[#Cleaned VI Notes|VI Notes]]
+[[#Week 5|In Depth VI Notes]]
-[[#Week 5| More VI Notes]]
+[[#Cleaned VI Notes|Basic VI Notes]]
+[[#Week 9|REGEX's]]
 =====Week 1=====
+<fs xx-large>Welcome to the best class you have ever taken</fs>
+This page includes some notes, typically major things, from each class session
+Please add notes whenever you can = )
 =====Week 2=====
 *Re-went over group and pwd command
@@ Line 244: / Line 250: @@
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 =====Tuesday=====
+Virtual class session day
+Started discussing wpa0
+in a man page, or vi, or a less pager you can use a forward slash to search for something
+Remember wildcards are specifically filenames, regex's are for text
+REGULAR EXPRESSIONS!!!!!!!
+Basic REGEX (in Unix)
+   * .  match any symbol (similar to ? in wildcards)
+   * *  match zero or more of the previous (similar, but different to * in wildcards)
+   * ^  match start of line
+   * $  match end of line
+   * \< match start of word
+   * \> match end of word
+   * [ ] character class; match any one of enclsed (similar to use as wildcard)
+   * [^ ] inverted character class; do not match any of enclosed (similar to use as wildcard)
+Extended REGEX
+   * + match 1 or more of the previous
+   * | logical or
+   * ( ) group together
+   * \( \) REGEX group
+   * ? match previous item at most once (0-1)
+   * {n} match previous item exactly n times ie " {3}" looks for exactly 3 spaces
+   * {n,} match previous n or more times
+   * {,m} match previous at most m times
+   * {n,m} match previous at least n, but no more than m times
+types of grep used to be used based on what REGEX's you need
+   *fgrep - fast grep; no REGEX use
+   *grep - regular grep; basic REGEX use
+   *egrep - extended grep; extended REGEX use
+you can still use extended regex with a regular grep, but they need to be preceded by a \, ie a grep "\?" should work like egrep "?"
+diff - a command that can show differences in files, assuming they are sorted
 =====Thursday=====
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+No class, free day to experiment and work on projects
 =====Week 10=====
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