exit with 127 if appled name wasn't found - it's more POSIXy

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
iproute: support onelink route option and print route flags

function                                             old     new   delta
print_route                                         1797    1865     +68
do_iproute                                          2097    2112     +15
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 83/0)               Total: 83 bytes

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
ash: fix handling of negative start value in ${v:start:len}

function                                             old     new   delta
subevalvar                                          1140    1168     +28

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
ash,hush: do not segfault on $((2**63 / -1))

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
typo fix in comment

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
modprobe,rmmod: reject module names with slashes

function                                             old     new   delta
add_probe                                             86     113     +27

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>