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bash:how_to:string_substitutions

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bash:how_to:string_substitutions [2018/08/02 23:52]
Rob Stroess
bash:how_to:string_substitutions [2024/02/16 01:04] (current)
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 ===== bash: "How To" ... utilize string substitutions ===== ===== bash: "How To" ... utilize string substitutions =====
 ^  string parameter substitution  ^^^^^ ^  string parameter substitution  ^^^^^
-^operation^what^code^example using:\\ export TST='abcabcaa'^result from\\ abcabcaa^ +^operation^what^code^example using:\\ export TST='abcabcaa'^result from\\ (abcabcaa)
-|remove|first occurence of substring '__xyz__' in string|STR=${STR/'__xyz__'}|echo ${TST/'bc'}|aabcaa| +|remove|first occurrence of substring '__xyz__' in string|STR=${STR/'__xyz__'}|echo ${TST/'bc'}|aabcaa\\  (a<del>bc</del>abcaa)
-|:::|substring '__xyz__' everywhere in string|STR=${STR%%//%%'__xyz__'}|echo ${TST%%//%%'bc'}|aaaa| +|:::|substring '__xyz__' everywhere in string|STR=${STR<nowiki>//</nowiki>'__xyz__'}|echo ${TST<nowiki>//</nowiki>'bc'}|aaaa\\  (a<del>bc</del>a<del>bc</del>aa)
-|:::|substring '__xyz__' at very beginning of string (prefix)|STR=${STR#'__xyz__'}|echo ${TST#'abca'}|bcaa| +|:::|substring '__xyz__' at very beginning of string (prefix)|STR=${STR#'__xyz__'}|echo ${TST#'abca'}|bcaa\\  (<del>abca</del>bcaa)
-|:::|substring '__xyz__' at very end of string (suffix)|STR=${STR%__xyz__}|echo ${TST%'bcaa'}|abca| +|:::|substring '__xyz__' at very end of string (suffix)|STR=${STR%__xyz__}|echo ${TST%'bcaa'}|abca\\  (abca<del>bcaa</del>)
-|:::|first __n__ characters|STR=${STR:__n__}|echo ${TST:2}|cabcaa| +|:::|first __n__ characters|STR=${STR:__n__}|echo ${TST:2}|cabcaa\\  (<del>ab</del>cabcaa)
-|:::|last __n__ characters|STR=${STR:-__n__}|echo ${TST::-3}|abcab| +|:::|last __n__ characters|STR=${STR:-__n__}|echo ${TST::-3}|abcab\\  (abcab<del>caa</del>)
-|extract|all characters after (!) position __n__\\ //(first char position: __n__=0)//|STR=${STR:__n__}|echo ${TST:1}|bcabcaa| +|extract|all characters after (!) position __n__\\ //(first char position: __n__=0)//|STR=${STR:__n__}|echo ${TST:1}|bcabcaa\\  (<del>a</del>bcabcaa)
-|:::|__m__ characters after (!) position __n__|STR=${STR:__n__:__m__}|echo ${TST:1:5}|bcabc| +|:::|__m__ characters after (!) position __n__|STR=${STR:__n__:__m__}|echo ${TST:1:5}|bcabc\\  (<del>a</del>bcabc<del>aa</del>)
-|:::|characters after (!) position __n__ until end of string minus __m__|STR=${STR:__n__:-__m__}|echo ${TST:1:-1}|bcabca| +|:::|characters after (!) position __n__ until end of string minus __m__|STR=${STR:__n__:-__m__}|echo ${TST:1:-1}|bcabca\\  (<del>a</del>bcabca<del>a</del>)
 +|convert|to upper case|STR=${STR<nowiki>^^</nowiki>}|echo ${TST<nowiki>^^</nowiki>}|ABCABCAA| 
 +|:::|to lower case|STR=${STR,,}|echo ${TST,,}|abcabcaa| 
 +|cut|from begin of string to first end of substring '__xyz__'|STR=${STR#*'__xyz__'}|echo ${TST#*'bc'}|abcaa\\  (<del>abc</del>abcaa)| 
 +|:::|from begin of string to last end of substring '__xyz__'|STR=${STR##*'__xyz__'}|echo ${TST##*'bc'}|aa\\  (<del>abcabc</del>aa)| 
 +|:::|from last occurrence of substring '__xyz__' to end of string|STR=${STR%'__xyz__'*}|echo ${TST%'bc'*}|abca\\  (abca<del>bcaa</del>)| 
 +|:::|from first occurrence of substring '__xyz__' to end of string|<nowiki>STR=${STR%%</nowiki>'__xyz__'*}|<nowiki>echo ${TST%%</nowiki>'c'*}|ab\\  (ab<del>cabcaa</del>)|
  
 +//work in progress//

on the occasion of the current invasion of Russia in Ukraine

Russian Stop this War
bash/how_to/string_substitutions.1533246750.txt · Last modified: 2024/02/16 01:02 (external edit)

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