yo
bash/zsh cowsay
overwrite ls
# note ls binary path
LS_BIN=$((type -P ls || type -p ls) | rev | cut '-d ' -f1 | rev)
COW_PATH=$(find /tmp/cheese.cow || echo cheese)
COW_BIN=$(find /tmp/cowthink || echo cowthink)
# override ls
function ls () { $LS_BIN $@ | $COW_BIN -n -f $COW_PATH | $COW_BIN -n -f $COW_PATH | $COW_BIN -n -f $COW_PATH; }
optionally download
# get cowsay perl script
echo "IyEvdXNyL2Jpbi9lbnYgcGVybAoKIyMKIyMgQ293c2F5CiMjCgp1c2UgQ3dkICdhYnNfcG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lsZV9wYXRoID0gIiI7CiR0aGVfY293ID0gIiI7Cgomc2x1cnBfaW5wdXQ7CiRUZXh0OjpX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IkcHJlZml4X2Rpci9zaGFyZS9jb3dzYXkiOwogICAgJHJlYWxfcHJlZml4X2RpciA9IGFi
c19wYXRoKCRwcmVmaXhfZGlyKTsKICAgIGlmICgkcmVhbF9wcmVmaXhfZGlyIGVxICIvdX
NyIikgewogICAgICAgICRldGNfZGlyID0gIi9ldGMiOwogICAgfSBlbHNlIHsKICAgICAg
ICAkZXRjX2RpciA9ICIkcmVhbF9wcmVmaXhfZGlyL2V0YyI7CiAgICB9CgogICAgbXkgQG
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ICBjbG9zZWRpcigkZGgpOwogICAgICAgIGZvcmVhY2ggKEBmaWxlcykgewogICAgICAgIC
AgICBteSAkZmlsZSA9ICIkY293cGF0aF9kX2Rpci8kXyI7CiAgICAgICAgICAgIGlmICgt
ZiAkZmlsZSAmJiAkZmlsZSA9fiAvXC5wYXRoJC8pIHsKICAgICAgICAgICAgICAgIG9wZW
4gbXkgJGZoLCAnPCcsICRmaWxlCiAgICAgICAgICAgICAgICAgICAgb3IgZGllICJDb3Vs
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Agd2hpbGUgKG15ICRlbnRyeSA9IDwkZmg+KSB7CiAgICAgICAgICAgICAgICAgICAgY2hv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ICgtZiAmJiAvXC4oY293KSQvKSB7CiAgICAgICAgbXkgJHJlbF9maWxlID0gc3Vic3RyKC
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ICAgICAgbXkgJGNvd19uYW1lID0gJHJlbF9maWxlOwogICAgICAgICRjb3dfbmFtZSA9fi
BzL1wuKGNvdykkLy87CiAgICAgICAgcHVzaCBAZm91bmRfY293cywgJGNvd19uYW1lOwog
ICAgfQp9CgpzdWIgbGlzdF9jb3dzX2luX2Nvd2RpciB7CiAgICBteSAoJGNvd2RpcikgPS
BAXzsKICAgIEBmb3VuZF9jb3dzID0gKCk7CiAgICAkc2VhcmNoX3N0YXJ0X2RpciA9ICRj
b3dkaXI7CiAgICBmaW5kKFwmZmluZF9jb3dmaWxlX2NhbGxiYWNrLCAkY293ZGlyKTsKIC
AgIHJldHVybiBcQGZvdW5kX2Nvd3M7Cn0KCnN1YiBsaXN0X2Nvd2ZpbGVzX3BhcnNlYWJs
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ZGlyOwogICAgbXkgJWNvd2ZpbGVzOwogICAgZm9yIG15ICRkIChAY293cGF0aCkgewogIC
AgICAgIG5leHQgdW5sZXNzIC1kICRkOwogICAgICAgIG15ICRjb3dzID0gbGlzdF9jb3dz
X2luX2Nvd2RpcigkZCk7CiAgICAgICAgZm9yIG15ICRjb3cgKEAkY293cykgewogICAgIC
AgICAgICAkY293ZmlsZXN7JGNvd30gPSAkY293OwogICAgICAgIH0KICAgIH0KICAgIG15
IEBjb3dmaWxlcyA9IHNvcnQga2V5cyAlY293ZmlsZXM7CiAgICByZXR1cm4gXEBjb3dmaW
xlczsKfQoKc3ViIGRlZmluZWRfY293c19zdHJ1Y3R1cmVkIHsKICAgIG15ICRjb3dzID0g
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fQogICAgfQogICAgbXkgQGFsbCA9IChAYmFzaWMsIEB0cnVlY29sb3IpOwogICAgcmV0dX
JuIHsKICAgICAgICBiYXNpYyA9PiBcQGJhc2ljLAogICAgICAgIHRydWVjb2xvciA9PiBc
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ICVzXG4iOwogICAgbXkgQGJvcmRlcjsgIyB1cC1sZWZ0LCB1cC1yaWdodCwgZG93bi1sZW
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CiAgICAgICAgJHRob3VnaHRzID0gJ28nOwogICAgICAgIEBib3JkZXIgPSBxd1sgKCApIC
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hlbHBdICAgIyBEaXNwbGF5IHRoaXMgaGVscCBzY3JlZW4KCk9wdGlvbnM6CgogICAgLWIs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 " | base64 -d > /tmp/cowthink
# get cheese.cow
echo "IyMKIyMgVGhlIGNoZWVzZSBmcm9tIG1pbGsgJiBjaGVlc2UKIyMKJHRoZV9jb3cgPSA8PE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" | base64 -d > /tmp/cheese.cow
chmod +x /tmp/cowthink
read