Most Popular Text Processing Commands

cat

cat Read one or more files and print them on standard output.

cat  filename.txt  (display the content of filename.txt)

cat  -n myfiles.txt   number all output lines, starting with 1

cat > newfile to exit, enter EOF (Ctrl-D)

cat >> newfile to append the file

vi editor

vi editor  External Link 1 2 A screen-oriented text editor. Vi has two modes insert mode and command mode. The editor begins in command mode, where cursor movement and copy/paste commands may be issued

vi filename (creating or opening a filename)

esc + i  insert the text

:wq  Save and exit

:q  exit without save

:wq! save and exit forcefully (! forcefully)