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Comment: first-line; also a bit more explicit wording
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| [[Anchor(faq7)]] | <<Anchor(faq7)>> |
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| The fastest way, not requiring external programs (but usable only with ["BASH"] and KornShell): | The fastest way, not requiring external programs (but usable only with [[BASH]] and KornShell): |
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| or | or for Bourne shells: |
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| ({{{expr}}} prints the number of characters matching the pattern {{{.*}}}, which is the length of the string) | ({{{expr}}} prints the number of characters matching the pattern {{{.*}}}, which is the length of the string.) |
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| or | Another one: |
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| (for a BSD/GNU version of {{{expr}}}. Do not use this, because it is not ["POSIX"]). | (This is for a BSD/GNU version of {{{expr}}}. Do not use this, because it is not [[POSIX]]). |
Is there a function to return the length of a string?
The fastest way, not requiring external programs (but usable only with BASH and KornShell):
${#varname}or for Bourne shells:
expr "$varname" : '.*'
(expr prints the number of characters matching the pattern .*, which is the length of the string.)
Another one:
expr length "$varname"
(This is for a BSD/GNU version of expr. Do not use this, because it is not POSIX).