filter - scripts

(8 lines)
   1 #!/bin/sh
   2 # Filter lines of input with a shell predicate.
   3 #   Usage: filter [varname (default: x)] predicate
   4 #   Example: ls | filter '[ -d "$x" ] && expr "$x" : ".*[0-9]"'
   5 [ $# -gt 1 ] && var="$1" && shift || var=x
   6 sh -c "while IFS= read -r $var; do
   7     $@ >/dev/null && echo \"\$$var\"
   8 done" || true