쿠버네티스 23.05.23

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/ 는 구분자이다.

^는 문자의 시작이다.

경로명을 써준다.

regex = Regular Expression

출처 : https://www.computerhope.com/unix/regex-quickref.htm

Metacharacter SequenceMeaningExample ExpressionExample Match

^	Start of string or line	^abc	abc (appearing at start of string or line)
$	End of string, or end of line	xyz$	xyz (appearing at end of string or line)
\b	Word boundary	ing\b	matching (matches ing if it is at the end of a word)
\B	NOT word-boundary	\Bing\B	stinger (matches ing if it is not at the beginning or end of the word)
\<	Start of word	\<when	whenever (matches when only if it is at the beginning of a word)
\>	End of word	ever\>	whenever (matches ever only if it is at the end of a word)

Metacharacter SequenceMeaningExample ExpressionExample Match

.	Matches any single character except the newline character.	ab.def	abcdef, ab9def, ab=def
\s	Matches a whitespace character (such as a space, a tab, a form feed, etc.)	abcd\se	abcd e, abcd(tab)e
\S	NOT whitespace	\S\S\s\S	AB D, 99(tab)9
\w	A word character. A word character is a letter, a number, or an underscore. This set of characters may also be represented by the regex character set [a-zA-Z0-9_]	\w\{1,\}-\w\{1,} (see quantifiers, below)	well-wishes, far-fetched
\W	NOT a word character	\w\W\{1,\}\w	a,!-(?&;b, 9-5

Metacharacter SequenceMeaningExample ExpressionExample Match

*	Zero or more of the preceding character	*cat**	cat, ct, caaaaaaaaaaaat
character\{m\}	Exactly m occurrences of character	f\{3\}	fff
character\{m,n\}	No fewer than m, but no more than n occurrences of character	g\{4,6\}	gggg, ggggg, gggggg
character\{m,\}	At least m occurrences of character	h\{2,\}	hh, hhhhhhhh, and hhhhhhhhhhhhhh would match, but h would not

<대표적인것만 확인>

*은 뭐가 들어가도 상관없음 ex) c*t = ct = cbt = caaaat

?는 한개의 문자열을 뜻함 ex) t?ble = table = tble(x)

^는 그냥 문자로 받아들여라. ex) ^/abc = /abc자체가 문자.

[root@localhost sunny]# setenforce 0
[root@localhost sunny]# cd /
[root@localhost /]# setenforce 0
[root@localhost /]# sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' etc/selinux/config

==>SELINUX=enforcing 를 /SELINUX=disabled/ 로 바꿔라

[root@localhost /]# swapoff -a ==> 스왑메모리 끄는 방법

[root@localhost /]# sed -i '/ swap / s/^$.*$$/#\1/g' /etc/fstab

[root@localhost /]# vi /etc/fstab

현재 swap 메모리가 #주석처리 됐다.