The shortcuts cmd-d and cmd-shift-d divide an existing session vertically or horizontally, respectively. ITerm2 allows you to divide a tab into many rectangular 'panes', each of which is a different terminal session. In Prefs > Profiles > Keys you can assign keys to move the beginning or end of the selection by a single character, word, or line. At most one line of text can be selected this way. To move the beginning of the selection to the left, press shift-tab. Then press tab and the end of the selection will advance by a word. Enter the beginning of the text you wish to copy and the find feature will select it in your window.
To select text without using the mouse, press cmd-f to open the find field. You can use the find feature's 'mouseless copy' feature.There are several ways to select text to copy to the clipboard: This chapter describes features of iTerm2 that go beyond basic usage and are not generally found in other terminal emulators.
