Compare contents of two files by deleting only unique lines from ‘file1′

comm -1 file1 file2

Find and copy all files with ‘.txt’ extention from a directory to another

find /home/binnyva -name '*.txt' | xargs cp -av --target-directory=/home/backup/ --parents

Sort contents of a file and remove repeated lines

sort file.txt | uniq

View from 1th to 5th line

sed -n '1,5p;5q' example.txt

Encrypt/Decrypt a file with GNU Privacy Guard - GPG.

#Encrypt
gpg -c file

#Decrypt
gpg file.gpg

Find the number of lines in a file using this command…

cat -n file
OR
wc -l file

Change user and group ownership of a file

chown user:group file

Creates a new from the given input file by assuming it is encoded in fromEncoding and converting it to toEncoding.

iconv -f fromEncoding -t toEncoding inputFile > outputFile

Shows all mounted file systems in Linux

cat /proc/mounts

This commands reverses a file in linux - the last line will be the first…

tac file.txt

tac = reverse of cat