entr

[historical] minimal shell implementation of entr
git clone git://mcdim.xyz/entr.git
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entr (422B)

      1 #!/bin/sh
      2 
      3 if [ "$#" -eq 0 ]; then
      4 	echo "$0: no arguments given" >&2
      5 	exit 1
      6 fi
      7 
      8 trigger_file=`cat`
      9 if ! [ -f "$trigger_file" ]; then
     10 	echo "$trigger_file: file doesn't exist" >&2
     11 	exit 1
     12 fi
     13 
     14 "$@"
     15 oldhash=$(cat "$trigger_file" | md5sum)
     16 for (( ; ; ))
     17 do
     18 	newhash=$(cat "$trigger_file" | md5sum)
     19 	if [ "$newhash" != "$oldhash" ]; then
     20 		newhash=$(cat "$trigger_file" | md5sum)
     21 		oldhash=$newhash
     22 		"$@"
     23 	fi
     24 	sleep .5
     25 done