cat filename

less filename

less -FX filename

alias aliasname='less -FX'

$ cat file
(ÐZ4 ?o=÷jï
$ od -c test
0000000 202 233   ( 320   K   j 357 024   J 017   h   Z   4 240   ?   o
0000020   = 367  n
0000023

cat

cat filename.txt

more filename.txt

less filename.txt

tail filename.txt

head filename.txt

cat filename | grep text_to_search -ni

vim filename
Or
 vi filename