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--- bash:string_substitutions [2018/08/02 23:32]
Rob Stroess created
+++ — (current)
@@ Line 1: / Line 1: @@
-===== bash: "How To" utilize string substitutions =====
-^  string parameter substitution  ^^^^^
-^operation^what^code^example using:\\ export TST='abcabcaa'^result from\\ abcabcaa^
-|remove|first occurence of substring '__xyz__' in string|STR=${STR/'__xyz__'}|echo ${TST/'bc'}|aabcaa|
-|:::|substring '__xyz__' everywhere in string|STR=${STR%%//%%'__xyz__'}|echo ${TST%%//%%'bc'}|aaaa|
-|:::|substring '__xyz__' at very beginning of string (prefix)|STR=${STR#'__xyz__'}|echo ${TST#'abca'}|bcaa|
-|:::|substring '__xyz__' at very end of string (suffix)|STR=${STR%__xyz__}|echo ${TST%'bcaa'}|abca|
-|:::|first __n__ characters|STR=${STR:__n__}|echo ${TST:2}|cabcaa|
-|:::|last __n__ characters|STR=${STR:-__n__}|echo ${TST::-3}|abcab|
-|extract|all characters after (!) position __n__\\ //(first char position: __n__=0)//|STR=${STR:__n__}|echo ${TST:1}|bcabcaa|
-|:::|__m__ characters after (!) position __n__|STR=${STR:__n__:__m__}|echo ${TST:1:5}|bcabc|
-|:::|characters after (!) position __n__ until end of string minus __m__|STR=${STR:__n__:-__m__}|echo ${TST:1:-1}|bcabca|

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