绮鹃�歛wk绯诲垪(16)锛歡awk鏀寔鐨勬鍒欒〃杈惧紡

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鍥炲埌锛�

• Linux绯诲垪鏂囩珷
  
• Shell绯诲垪鏂囩珷
  
• Awk绯诲垪鏂囩珷

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gawk鏀寔鐨勬鍒�

.       # 鍖归厤浠绘剰瀛楃锛屽寘鎷崲琛岀
^
$
[...]
[^...]
|
+
*
?
()
{m}
{m,}
{m,n}
{,n}

[:lower:]
[:upper:]
[:alpha:]
[:digit:]
[:alnum:]
[:xdigit:]
[:blank:]
[:space:]
[:punct:]
[:graph:]
[:print:]
[:cntrl:]

浠ヤ笅鏄痝awk鏀寔鐨勶細
\y    鍖归厤鍗曡瘝宸﹀彸杈圭晫閮ㄥ垎鐨勭┖瀛楃浣嶇疆 "hello world"
\B    鍜孿y鐩稿弽锛屽尮閰嶅崟璇嶅唴閮ㄧ殑绌哄瓧绗︿綅缃紝渚嬪"crate" ~ `/c\Brat\Be/`鎴愬姛
\<    鍖归厤鍗曡瘝宸﹁竟鐣�
\>    鍖归厤鍗曡瘝鍙宠竟鐣�
\s    鍖归厤绌虹櫧瀛楃
\S    鍖归厤闈炵┖鐧藉瓧绗�
\w    鍖归厤鍗曡瘝缁勬垚瀛楃(澶у皬鍐欏瓧姣嶃�佹暟瀛椼�佷笅鍒掔嚎)
\W    鍖归厤闈炲崟璇嶇粍鎴愬瓧绗�
\`    鍖归厤瀛楃涓茬殑缁濆琛岄  "abc\ndef"
\'    鍖归厤瀛楃涓茬殑缁濆琛屽熬

gawk涓嶆敮鎸佹鍒欎慨楗扮锛屾墍浠ユ棤娉曠洿鎺ユ寚瀹氬拷鐣ュぇ灏忓啓鐨勫尮閰嶃��

濡傛灉鎯宠瀹炵幇蹇界暐澶у皬鍐欏尮閰�锛屽垯鍙互灏嗗瓧绗︿覆鍏堣浆鎹负澶у啓銆佸皬鍐欏啀杩涜鍖归厤銆傛垨鑰呰缃瀹氫箟鍙橀噺IGNORECASE涓洪潪0鍊笺��

# 杞崲涓哄皬鍐�
awk 'tolower($0) ~ /bob/{print $0}' a.txt

# 璁剧疆IGNORECASE
awk '/BOB/{print $0}' IGNORECASE=1 a.txt