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                [TOC] # shell中變量子字符串的常用操作 |id|表達式|說明| |-|-|-| |1|${#string}|返回$string的長度| |2|${string:position}|在$string中,從$position之后開始提取子字符串| |3|${string:position:length}|在$string中,從位置$position之后開始提取長度為$length的子串| |4|${string#substring}|從變量$string開頭開始刪除最短匹配$substring子字符串| |5|${string##substring}|從變量$string開頭開始刪除最長匹配$substring子字符串| |6|${string%substring}|從變量$string結尾開始刪除最短匹配$substring子字符串| |7|${string%%substring}|從變量$string結尾開始刪除最長匹配$substring子字符串| |8|${string/substring/replace}|使用$replace,來替代第一個匹配$substring| |9|${string/#substring/replace}|如果$string前綴匹配$substring,就用$replace來代替匹配$substring| |10|${string/%substring/replace}|如果$string后綴匹配$substring,就用$replace來代替匹配$substring| ## 舉例說明 首先,定義變量`PHPER=“hello world”`, ~~~ [luo@LNMP-CenOS-6.5 ~] $ PHPER="hello world" [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER} hello world ~~~ ### 返回變量PHPER的值長度 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${#PHPER} 11 ~~~ ### 截取變量值從第2個字符之后開始取,默認取后面字符的全部(第二個字符串不包含在內) ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER:2} llo world ~~~ ### 截取PHPER變量字符串從第2個字符之后開始,取兩個字符 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER:2:2} ll ~~~ ### 從變量開頭刪除子字符串 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER#hello} world ~~~ ### 從變量最后開始匹配子字符串并刪除 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER%ld} hello wor ~~~ ### 從變量結尾開始刪除最長匹配子字符串 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER%%o world} hell ~~~ ### 使用特定字符串代替第一個匹配到的字符串 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER/hello/hi} hi world ~~~ ### 使用特定字符串替代從變量結尾開始匹配的子字符串 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER/%world/beijing} hello beijing ~~~ ### 使用特定字符串替代從變量開頭開始匹配的字符串 ~~~ [luo@LNMP-CenOS-6.5 ~] $ echo ${PHPER/#hello/hi} hi world ~~~
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