Assignment | |
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Assign value to variable if variable is not already set. Value will be returned.Couple with : no-op if return value is to be discarded. |
${variable="value"} : ${variable="value"} |
Removal | |
Delete shortest match of needle from front of haystack |
${haystack#needle} |
Delete longest match of needle from front of haystack |
${haystack##needle} |
Delete shortest match of needle from back of haystack |
${haystack%needle} |
Delete longest match of needle from back of haystack |
${haystack%%needle} |
Replacement | |
Replace first match of needle with replacement from haystack |
${haystack/needle/replacement} |
Replace all matches of needle with replacement from haystack |
${haystack//needle/replacement} |
If needle matches front of haystack replace with replacement |
${haystack/#needle/replacement} |
If needle matches back of haystack replace with replacement |
${haystack/%needle/replacement} |
Substitution | |
If variable not set, return value , else variable |
${variable-value} |
If variable not set or empty, return value , else variable |
${variable:-value} |
If variable set, return value , else null string |
${variable+value} |
If variable set and not empty, return value , else null string |
${variable:+value} |
Extraction | |
Extract length characters from variable starting at position |
${variable:position:length} |
String length of variable |
${#variable} |
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Bash string manipulation cheatsheet.
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