fix: hanging awk script

  }

  function awkenvsubst() {

    awk '{while(match($0,"[$%]{[^}]*}")) {g0=substr($0,RSTART,RLENGTH); val=ENVIRON[substr(g0,3,RLENGTH-3)]; gsub(g0,val)}}1'

    awk '{while(match($0,"[$%]{[^}]*}")) {var=substr($0,RSTART+2,RLENGTH -3);val=ENVIRON[var]; gsub("[$%]{"var"}",val)}}1'

  }

  function exec_hook() {