24 lines
795 B
Markdown
24 lines
795 B
Markdown
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# string operations.
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## case operations.
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```bash
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local myword="Hello"
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echo ${myword^} # first letter uppercase.
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echo ${myword^^} # all uppercase.
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echo ${myword,} # first letter lowercase.
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echo ${myword,,} # all lowercase.
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echo ${myword~} # reverses the case for the first letter.
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echo ${myword~~} # reverses the case for every letter.
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```
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## substitution.
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```bash
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local example="file.tar.gz"
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echo "${example#file}" # ".tar.gz" - remove "file" from the start.
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echo "${example%gz}" # "file.tar." - remove "gz" from the end.
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echo "${example#*.}" # "tar.gz" - shortest from the start to dot.
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echo "${example##*.}" # "gz" - longest from the start to dot.
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echo "${example%.*}" # "file.tar" - shortest from the end to dot.
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echo "${example%%.*}" # "file" - longest from the end to dot.
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```
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