user-tools/filterexec

   1 #!/bin/bash
   2
   3 true <<'EOF'
   4
   5 =pod
   6
   7 =head1 NAME
   8
   9 filterexec - Echo those arguments with which the given command returns zero.
  10
  11 =head1 SYNOPSIS
  12
  13 filterexec I<COMMAND> [I<ARGS>] -- I<DATA-1> [I<DATA-2> [... I<DATA-n>]]
  14
  15 =head1 DESCRIPTION
  16
  17 Prints each I<DATA> (1 per line) only if command I<COMMAND ARGS DATA> exits
  18 succesfully, ie. with zero exit status.
  19
  20 If you want to evaluate not command line arguments, but data read on STDIN,
  21 then combine filterexec(1) with foreach(1).
  22
  23 =head1 EXAMPLE
  24
  25   filterexec test -d -- $(ls)
  26
  27 Shows only the directories.
  28 The shell's tokenization may wrongly splits up file names containing space.
  29 Perhaps set C<IFS> to newline only.
  30
  31   ls -1 | foreach filterexec test -d --
  32
  33 Same, but file names are supplied 1-by-1, not all at once,
  34 hence filterexec(1) is invoked multiple times.
  35
  36 =cut
  37
  38 EOF
  39
  40 # text editor syntax highlighter fix: '
  41
  42
  43
  44 declare -a command=()
  45 declare -a items=()
  46
  47 if [ "$1" = --help ]
  48 then
  49         pod2text "$0"
  50         exit 0
  51 fi
  52
  53 while [ $# -gt 0 ]
  54 do
  55         case "$1" in
  56         --)
  57                 shift
  58                 break;;
  59         *)
  60                 command+=("$1")
  61                 ;;
  62         esac
  63         shift
  64 done
  65
  66 items=("$@")
  67
  68 for item in "${items[@]}"
  69 do
  70         if "${command[@]}" "$item"
  71         then
  72                 printf '%s\n' "$item"
  73         fi
  74 done