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bash:how_to:string_substitutions
bash: "How To" ... utilize string substitutions
| string parameter substitution | ||||
|---|---|---|---|---|
| operation | what | code | example using: export TST='abcabcaa' | result from (abcabcaa) |
| remove | first occurrence of substring 'xyz' in string | STR=${STR/'xyz'} | echo ${TST/'bc'} | aabcaa (a |
| substring 'xyz' everywhere in string | STR=${STR//'xyz'} | echo ${TST//'bc'} | aaaa (a |
|
| substring 'xyz' at very beginning of string (prefix) | STR=${STR#'xyz'} | echo ${TST#'abca'} | bcaa ( |
|
| substring 'xyz' at very end of string (suffix) | STR=${STR%xyz} | echo ${TST%'bcaa'} | abca (abca |
|
| first n characters | STR=${STR:n} | echo ${TST:2} | cabcaa ( |
|
| last n characters | STR=${STR:-n} | echo ${TST::-3} | abcab (abcab |
|
| extract | all characters after (!) position n (first char position: n=0) | STR=${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 ${TST:1:-1} | bcabca ( |
|
| convert | to upper case | STR=${STR^^} | echo ${TST^^} | ABCABCAA |
| to lower case | STR=${STR,,} | echo ${TST,,} | abcabcaa | |
| cut | from begin of string to first end of substring 'xyz' | STR=${STR#*'xyz'} | echo ${TST#*'bc'} | abcaa ( |
| from begin of string to last end of substring 'xyz' | STR=${STR##*'xyz'} | echo ${TST##*'bc'} | aa ( |
|
| from last occurrence of substring 'xyz' to end of string | STR=${STR%'xyz'*} | echo ${TST%'bc'*} | abca (abca |
|
| from first occurrence of substring 'xyz' to end of string | STR=${STR%%'xyz'*} | echo ${TST%%'c'*} | ab (ab |
|
work in progress
on the occasion of the current invasion of Russia in Ukraine
bash/how_to/string_substitutions.txt · Last modified: 2024/02/16 01:04 (external edit)
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