To change the default size of the terminal window in Solaris, you need to do the following.
1) Go to the directory /usr/share/vte/termcap/ and edit the file xterm
i.e., $ vi /usr/share/vte/termcap/xterm
2) Look for :co#115:it#8:li#36:\
3) In the above line you can change the numbers like for example, put 77 after "co#" and put 48 after "li#"
4) Then every terminal you open will open with the size that you have mentioned in the above line.
OR
You can also add an alias as below in the .profile or .bashrc or .cshrc, wherever it is applicable for you.
alias xterm='xterm -geometry 77x48'
Any one of the above mentioned methods should do the work of changing the default terminal size.
Note : You need to reboot your PC after you have made the above changes for your changes to be effective.
