В домашнем каталоге в файле text.txt лежит список зеркал.

Необходимо с помощью имеющихся средств написать и выполнить скрипт, который комментирует в исходном файле все строки, относящиеся к не российским зеркалам (домен .ru). Если в начале строки файла уже стоит символ комментария (#), то новый добавлять не нужно.

TCP: Hash tables configured (established 1024 bind 512)
TCP reno registered
Total HugeTLB memory allocated, 0
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
Real Time Clock Driver v1.12ac
JS clipboard: I/O at 0x03c0
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a XScale
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
hda: JSLinux HARDDISK, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: max request size: 128KiB
hda: 116736 sectors (59 MB) w/256KiB Cache, CHS=115/16/63
hda: unknown partition table
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Using IPI Shortcut mode
Time: pit clocksource has been installed.
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 128k freed
Booted in 2.749 s
Welcome to JS/Linux
\var\root # cat text.txt
Server = http://cake.lib.fit.edu/archlinux/$repo/os/$arch
Server = http://mirrors.cat.pdx.edu/archlinux/$repo/os/$arch
Server = http://cosmos.cites.illinois.edu/pub/archlinux/$repo/os/$arch
Server = http://www.gtlib.gatech.edu/pub/archlinux/$repo/os/$arch
Server = http://mirror.ancl.hawaii.edu/linux/archlinux/$repo/os/$arch
Server = http://mirrors.kernel.org/archlinux/$repo/os/$arch
Server = http://mirror.us.leaseweb.net/archlinux/$repo/os/$arch
Server = http://lug.mtu.edu/archlinux/ftpfull/$repo/os/$arch
Server = http://mirror.umd.edu/archlinux/$repo/os/$arch
Server = http://mirrors.gigenet.com/archlinux/$repo/os/$arch
Server = http://mirrors.liquidweb.com/archlinux/$repo/os/$arch
Server = http://mirrors.xmission.com/archlinux/$repo/os/$arch
Server = http://mirror.mocker.org/archlinux/$repo/os/$arch
Server = http://ftp.osuosl.org/pub/archlinux/$repo/os/$arch
Server = http://mirror.rit.edu/archlinux/$repo/os/$arch
Server = http://mirrors.rutgers.edu/archlinux/$repo/os/$arch
Server = http://schlunix.org/archlinux/$repo/os/$arch
Server = http://mirrors.lax1.thegcloud.com/arch/$repo/os/$arch
Server = http://hive.ist.unomaha.edu/archlinux/$repo/os/$arch
Server = http://mirror.yellowfiber.net/archlinux/$repo/os/$arch

## Uzbekistan
Server = http://mirrors.st.uz/archlinux/$repo/os/$arch

## Viet Nam
Server = http://mirror-fpt-telecom.fpt.net/archlinux/$repo/os/$arch

## South Africa
Server = http://ftp.wa.co.za/pub/archlinux/$repo/os/$arch
\var\root #