Bash functional
From wikinotes
Filter
# filters out results not matching 'grep foo' find . \ | while read line; do \ echo $line | grep foo && echo "$line"; \ done
Map
NOTE:
If your callable accepts parameter as stdin, you don't need map (ex. grep/sed work just fine from stdin).
map() { # Call callable/params($*), passing each each STDIN line as the last parameter local input while read -r input; do "$@" "${input}" done }Example
print_if_divisible_by_2() { if [ $(($1 % 2)) -eq 0 ] ; then echo "$1:yes" else echo "$1:no" fi } echo {1..4} | tr ' ' '\n' | map print_if_divisible_by_2 #> 1:no #> 2:yes #> 3:no #> 4:yes