John Siu Blog

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STR="line 1
line2"

# The :: is printed once only.
for i in ${STR}; do echo :: ${i}; done
:: line 1
line2

# Add = in front of variable to split it like bash.
for i in ${=STR}; do echo :: ${i}; done
:: line
:: 1
:: line2

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a=1; b=2

if [[${a} = ${b}]] ... # zsh: no matches found: [[1=2]]
if [[${a}=${b}]] ...   # zsh: bad pattern: [[1
if [[ ${a}=${b} ]] ... # This will always be true. Logical error.

if [[ ${a} = ${b} ]]   # Correct
then
  ...
fi

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A=2; C=1
((C+=1)) # C = 2
((A=A+C)) # A = 4
echo A:${A} C:${C}

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for i in {1..10}; do ...; done
for i in {1..${VAR}}; do ...; done

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a=10
b="abc" # This is ok, not inside index.

typeset -A MY_ARRAY

MY_ARRAY[1]=1
MY_ARRAY[${a}]=1          # Index is 10, MY_ARRAY[10]=1
MY_ARRAY[2,${b}]="Hello" # Index is [2,abc], MY_ARRAY[2,abc]="Hello!"