UNIX for Dummies Questions & Answers

$ export ABC1=/my/dir
$ export t=2
$ echo $ABC1
/my/dir
$ echo $ABC$t
2
$ echo $ABC${t}
2

echo $ABC1$t

$ ABC1=/my/dir
$ t=1
$ eval echo \$ABC$t
/my/dir

export ABC1=/my/dir1
export ABC2=/my/dir2
export ABC3=/my/dir3
for i in 1 2 3
do
echo $ABC$i
mkdir -p $ABC$i
done

export ABC1=/my/dir1
export ABC2=/my/dir2
export ABC3=/my/dir3
for i in 1 2 3
do
echo $ABC$i
mkdir -p $ABC$i
done