How to find the length of an array in shell

Question

How do I find the length of an array in shell   For example   arr  1 2 3 4 5    And I want to get its length  which is 5 in this case

User · Answer

In the Fish Shell the length of an array can be found with     set a 1 2 3 4   count  a 4

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this works well for me      arglen        argparam        if    arglen -eq  3         then             echo Valid Number of arguments             echo  Arguments are         else             echo only four arguments are allowed     fi

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For those who still searching a way to put the length of an array into a variable   foo   echo    ARRAY

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Assuming bash     gt  declare -a foo   gt  foo 0   foo    gt  foo 1   bar    gt  foo 2   baz    gt  echo    foo     3   So     ARRAY     expands to the length of the array ARRAY

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in tcsh or csh     gt  set a     1 2 3 4 5     gt  echo   a 5

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a  1 2 3 4    echo    a     4

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From Bash manual         parameter       The length in characters of the expanded value of parameter is substituted  If parameter is        or          the value substituted is the   number of positional parameters  If parameter is an array name   subscripted by        or          the value substituted is the number of   elements in the array  If parameter is an indexed array name   subscripted by a negative number  that number is interpreted as   relative to one greater than the maximum index of parameter  so   negative indices count back from the end of the array  and an index of   -1 references the last element    Length of strings  arrays  and associative arrays  string  0123456789                      create a string of 10 characters array  0 1 2 3 4 5 6 7 8 9              create an indexed array of 10 elements declare -A hash hash   one  1  two  2  three  3         create an associative array of 3 elements echo  string length is     string       length of string echo  array length is     array         length of array using   as the index echo  array length is     array         length of array using   as the index echo  hash length is     hash           length of array using   as the index echo  hash length is     hash           length of array using   as the index   output   string length is  10 array length is  10 array length is  10 hash length is  3 hash length is  3   Dealing with     the argument array   set arg1 arg2  arg 3  args copy        echo  number of args is      echo  number of args is         echo  args copy length is     args copy        output   number of args is  3 number of args is  3 args copy length is  3

[arrays] How to find the length of an array in shell?

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