ref: adc4463f0ca6590f216aadb1e75390977fe1ec49
dir: /bin/wrap/
#!/bin/rc
rfork e
fn usage {>[1=2] echo 'usage:' $usage && exit 'usage'}
usage='wrap start [end]'
while(~ $1 -* && ! ~ $1 --){
switch($1){
case *
usage
}
shift
}
if(~ $1 --)
shift
if(~ $#* 0)
usage
s0 = $1
s1 = $2
if(~ $#* 1)
s1 = $s0
echo -n $s0
cat
echo -n $s1