> ## Documentation Index > Fetch the complete documentation index at: https://upstash-redis-1-18.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # String commands > Commands for storing and manipulating string values. Append value to a string Decrement integer value by 1 Decrement integer by amount Delete a string when a condition matches Get the digest of a string value Get string value Get value and delete key Get value and set expiration Get substring of string Set value and return old value Increment integer value by 1 Increment integer by amount Increment float by amount Get values of multiple keys Set multiple keys at once Set multiple keys with one expiration Set multiple keys if none exist Set value with ms expiration Set string value Set value with expiration Set value if key doesn't exist Overwrite part of string Get string length