Shell - ##, #, %%, %

$>var=abcabc123

$>echo ${var#*b}
cabc123

$>echo ${var##*b}
c123

$>echo ${var%b}
abcabc123

$>echo ${var%b*}
abca

$>echo ${var%%b*}
a

 

frank@ZZHPC:~$ a=/project/batch/tables/20180301
frank@ZZHPC:~$ echo ${a##*/}
20180301
frank@ZZHPC:~$ echo ${a%/*}
/project/batch/tables