paramflags.hints

@          array elements
c          count elements of array/string
k,v        returns keys, values of associative array
u          unique, deduplicate entries
A(A)       create (associative) array, useful with ${(A)...=...}
s:string:  field splitting at string
f          split at newlines (ps:\\n:)
z (Z:opt:) split result into shell words
0          split with 0-bytes: ps:\\0:
j:string:  join words of array with string as separator
F          join words of array with newlines (pj:\\n:)
w          count words, use s to define word delimiter
W          count words, double delimiters count doubly
i          sort case insensitive. Combine with n, O
n          sort numerically
o          sort in ascending order
O          reverse sort order
a          sort in array index order (with O reversed)
U          convert to uppercase
L          convert to lowercase
V          make special characters visible
q          quote, double quote, single quote, 
Q          remove level of quoting
C          capitalize first letters of words in result
l:e:       pad (e)expression to the left. 
r:e:       right pad (e)xpression
D          substitute shortened names for directories (~)
%          expand %-escapes as in prompts
p          recognize same escape sequences as print
g:opts:    process escape sequences
e          eval: parameter expansion, command substitution and arithmetic expansion on result
P          interpret value of parameter as a parameter
t          diplay variable type
X          report errors with pattern matching forms
#          interpret as numeric expression
m          multibyte magic