# basic cases | |
a=1 | |
a+=4 | |
echo $a | |
x=(1 2 3) | |
x+=(4 5 6) | |
echo ${x[@]} | |
x[4]+=1 | |
echo ${x[@]} | |
# trickier cases | |
a+=5 printenv a | |
echo $a | |
# if the integer flag is set, ksh93 appears to do arithmetic += and evaluate | |
# old value as an arithmetic expression | |
a= | |
typeset -i a | |
a+=7 | |
echo $a | |
b=4+1 | |
typeset -i b | |
b+=37 | |
echo $b | |
unset x | |
x=(1 2 3 4 5) | |
typeset -i x | |
x[4]+=7 | |
echo ${x[@]} | |
unset x | |
typeset -i x | |
x=([0]=7+11) | |
echo ${x[@]} | |
unset x | |
x=(1 2 3 4 5) | |
typeset -i x | |
#x[4]=7+11 | |
x=(1 2 3 4 [4]=7+11 ) | |
echo ${x[@]} | |
x=( 1 2 [2]+=7 4 5 ) | |
echo ${x[@]} | |
x+=( [3]+=9 [5]=9 ) | |
echo ${x[@]} | |
unset a | |
a=1 | |
export a+=4 | |
printenv a | |
printenv a+ | |
unset x | |
typeset -i x=4+5 | |
echo $x | |
unset x | |
typeset x+=4 | |
echo $x | |
typeset -i x+=5 | |
echo $x | |
readonly x+=7 | |
echo $x | |
x+=5 |