grep

$ curl -L https://tinyurl.com/zeyq9vc | grep fish
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 –:–:– –:–:– –:–:– 0
1 916k 1 16384 0 0 11778 0 0:01:19 0:00:01 0:01:18 11778bluefish
bluefish’s
bluefishes
catfish
catfish’s
catfishes
codfish
codfish’s
codfishes
crawfish
crawfish’s
crawfishes
crayfish
crayfish’s
crayfishes
cuttlefish
cuttlefish’s
cuttlefishes
dogfish
dogfish’s
dogfishes
dwarfish
elfish
fish
fish’s
fishbowl
fishbowl’s
fishbowls
fished
fisher
fisher’s
fisheries
fisherman
fisherman’s
fishermen
fishers
fishery
fishery’s
fishes
fishhook
fishhook’s
fishhooks
fishier
fishiest
fishing
fishing’s
fishnet
fishnet’s
fishnets
fishtail
fishtailed
fishtailing
fishtails
fishwife
fishwife’s
fishwives
fishy
flatfish
flatfish’s
flatfishes
goldfish
goldfish’s
goldfishes
jellyfish
jellyfish’s
jellyfishes
kingfisher
kingfisher’s
kingfishers
62 916k 62 575k 0 0 246k 0 0:00:03 0:00:02 0:00:01 596koafish
raffish
sailfish
sailfish’s
sailfishes
selfish
selfishly
selfishness
selfishness’s
shellfish
shellfish’s
shellfishes
silverfish
silverfish’s
silverfishes
standoffish
starfish
starfish’s
starfishes
sunfish
sunfish’s
sunfishes
swordfish
swordfish’s
swordfishes
unselfish
unselfishly
unselfishness
unselfishness’s
weakfish
weakfish’s
weakfishes
whitefish
whitefish’s
whitefishes
wolfish
100 916k 100 916k 0 0 341k 0 0:00:02 0:00:02 –:–:– 694k

$ numers='one two three'
$ echo $numers
one two three

$ echo $LINES x $COLUMNS
24 x 80
$ echo $PATH
$ ls bin
http://bashrcgenerator.com

$ alias ll=’ls -la’
$ ll

The Bash Academy
Bash Beginners Guide
Bash Programming HOWTO
Regexr — Learn Regular Expressions