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Info Catalog
(m4.info) Text handling
(m4.info) Index macro
10.1 Calculating length of strings
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The length of a string can be calculated by `len':
-- Builtin: len (STRING)
Expands to the length of STRING, as a decimal number.
The macro `len' is recognized only with parameters.
len()
=>0
len(`abcdef')
=>6
Info Catalog
(m4.info) Text handling
(m4.info) Index macro