2267  ls -l [0-9]* | sed s/[0-9]/hello
 2268  ls -l [0-9]* | sed s/[0-9]*/hello
 2269  ls -l [0-9]* | sed s/[0-9]/test
 2270  ls -l [0-9]* | sed s/[0-9]*/test
 2271  ls -l [0-9]* | sed s/[0-9]
 2272  ls -l [0-9]* | sed s/[?]/test
 2273  ls -l [0-9]* | sed s/?/test
 2274  ls -l [0-9]* | sed s/./test
 2275  tmux a
 2276  ls -l [0-9]* | sed 's/[0-9]/test'
 2277  ls -l [0-9]* | sed s/[0-9]/test
 2278  ls -l [0-9]* | sed s/.py/test
 2279  ls -l [0-9]*
 2280  ls -l [0-9]* | sed s/twitter/test
 2281  sed /s/twitter/test < ls -l [0-9]*
 2282  ls -l [0-9]* 2&>1
 2283  ls -l [0-9]* 2&>1 | sed s/twitter/test