tail -100, head -150 to extract the last 100 or first 150 rows of a file
.
tail -n
Return the last n, lines from a specified file
head -n
Return the first n lines from a file
cp
Copy
mv
Movew
mkdir
Make Directory
rmdir
Remove Directory
sort, uniq respectively sort a file and remove dupicate entries (you can sort alphabetically or numerically depending on the option; default is alphabetical order)
Sort
gzip
compress/uncompress files
wc
Count number of rows and words in a text file
grep
identify all rows containing a specific string in a text file (it helps to be familiar with regular expression)